10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2015

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number: 000-51531

 

SUNESIS PHARMACEUTICALS, INC.

(Exact Name of Registrant as Specified in its Charter)

Delaware	94-3295878
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification Number)

395 Oyster Point Boulevard, Suite 400

South San Francisco, California 94080

(Address of Principal Executive Offices including Zip Code)

(650) 266-3500

(Registrant’s Telephone Number, Including Area Code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See the definitions of “large accelerated filer”, “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	¨	Accelerated filer	x
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Exchange Act Rule 12b-2).    Yes  ¨    No  x

The registrant had 75,470,899 shares of common stock, $0.0001 par value per share, outstanding as of July 30, 2015.

SUNESIS PHARMACEUTICALS, INC.

TABLE OF CONTENTS

		Page No.
PART I. FINANCIAL INFORMATION		3
Item 1.	Financial Statements:	3
	Condensed Consolidated Balance Sheets as of June 30, 2015 and December 31, 2014	3
	Condensed Consolidated Statements of Operations and Comprehensive Loss for the Three and Six Months Ended June 30, 2015 and 2014	4
	Condensed Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2015 and 2014	5
	Notes to Condensed Consolidated Financial Statements	6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	14
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	19
Item 4.	Controls and Procedures	20
PART II. OTHER INFORMATION		21
Item 1.	Legal Proceedings	21
Item 1A.	Risk Factors	21
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	34
Item 3.	Defaults Upon Senior Securities	34
Item 4.	Mine Safety Disclosures	34
Item 5.	Other Information	34
Item 6.	Exhibits	34
	Signatures	35

PART I — FINANCIAL INFORMATION

Item 1. Financial Statements

SUNESIS PHARMACEUTICALS, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands)

	June 30, 2015			December 31, 2014
	(Unaudited)			(1)
ASSETS
Current assets:
Cash and cash equivalents	$	20,302		$	22,186
Marketable securities		19,254			20,795
Prepaids and other current assets		1,165			1,223
Total current assets		40,721			44,204
Property and equipment, net		19			42
Total assets	$	40,740		$	44,246
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	2,282		$	3,177
Accrued clinical expense		2,249			3,112
Accrued compensation		1,245			2,287
Other accrued liabilities		4,072			3,087
Current portion of deferred revenue		3,418			3,418
Current portion of notes payable		3,253			9,257
Warrant liability		1,765			3,543
Total current liabilities		18,284			27,881
Non-current portion of deferred revenue		854			2,563
Non-current portion of notes payable		4,421			—
Commitments
Stockholders’ equity:
Common stock		7			7
Additional paid-in capital		557,953			536,499
Accumulated other comprehensive loss		(5	)		(7	)
Accumulated deficit		(540,774	)		(522,697	)
Total stockholders’ equity		17,181			13,802
Total liabilities and stockholders’ equity	$	40,740		$	44,246

(1) The condensed consolidated balance sheet as of December 31, 2014 has been derived from the audited financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.

See accompanying notes to condensed consolidated financial statements.

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SUNESIS PHARMACEUTICALS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS

(In thousands, except per share amounts)

	Three months ended June 30,						Sixmonths ended June 30,
	2015			2014			2015			2014
	(Unaudited)						(Unaudited)
Revenue:
License and other revenue	$	854		$	1,989		$	1,708		$	3,984
Total revenues		854			1,989			1,708			3,984
Operating expenses:
Research and development		6,302			7,206			10,814			14,758
General and administrative		5,175			6,387			10,286			9,804
Total operating expenses		11,477			13,593			21,100			24,562
Loss from operations		(10,623	)		(11,604	)		(19,392	)		(20,578	)
Interest expense		(233	)		(470	)		(472	)		(1,017	)
Other income (expense), net		1,907			293			1,787			(4,759	)
Net loss		(8,949	)		(11,781	)		(18,077	)		(26,354	)
Unrealized gain (loss) on available-for-sale securities		—			(11	)		2			(4	)
Comprehensive loss	$	(8,949	)	$	(11,792	)	$	(18,075	)	$	(26,358	)
Basic and diluted loss per common share:
Net loss:
Basic	$	(8,949	)	$	(11,781	)	$	(18,077	)	$	(26,354	)
Diluted	$	(10,816	)	$	(12,114	)	$	(18,077	)	$	(26,354	)
Shares used in computing net loss per common share:
Basic		72,513			60,246			70,090			58,291
Diluted		72,525			61,895			70,090			58,291
Net loss per common share:
Basic	$	(0.12	)	$	(0.20	)	$	(0.26	)	$	(0.45	)
Diluted	$	(0.15	)	$	(0.20	)	$	(0.26	)	$	(0.45	)

See accompanying notes to condensed consolidated financial statements.

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SUNESIS PHARMACEUTICALS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

	Six months ended June 30,
	2015			2014
	(Unaudited)
Cash flows from operating activities
Net loss	$	(18,077	)	$	(26,354	)
Adjustments to reconcile loss to net cash used in operating activities:
Stock-based compensation expense		3,332			2,770
Depreciation and amortization		22			11
Amortization of debt discount and debt issuance costs		75			217
Change in fair value of warrant liability		(1,778	)		4,604
Changes in operating assets and liabilities:
Prepaids and other assets		54			57
Accounts payable		(895	)		(440	)
Accrued clinical expense		(863	)		(812	)
Accrued compensation		(1,042	)		(431	)
Other accrued liabilities		1,074			2,730
Deferred revenue		(1,709	)		(3,978	)
Net cash used in operating activities		(19,807	)		(21,626	)
Cash flows from investing activities
Purchases of property and equipment		—			(23	)
Purchases of marketable securities		(18,927	)		(32,934	)
Proceeds from maturities of marketable securities		20,470			25,320
Net cash provided by (used in) investing activities		1,543			(7,637	)
Cash flows from financing activities
Principal payments on notes payable		(1,642	)		(4,573	)
Proceeds from issuance of common stock and warrants in underwritten offering, net		—			40,012
Proceeds from issuance of common stock through controlled equity offering facilities, net		17,675			4,726
Proceeds from exercise of warrants, stock options and stock purchase rights		347			738
Net cash provided by financing activities		16,380			40,903
Net (decrease) increase in cash and cash equivalents		(1,884	)		11,640
Cash and cash equivalents at beginning of period		22,186			15,121
Cash and cash equivalents at end of period	$	20,302		$	26,761
Supplemental disclosure of non-cash activities
Fair value of warrants issued in connection with notes payable	$	100		$	—

See accompanying notes to condensed consolidated financial statements.

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SUNESIS PHARMACEUTICALS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

JUNE 30, 2015

(Unaudited)

1. Company Overview

Description of Business

Sunesis Pharmaceuticals, Inc. (the “Company” or “Sunesis”) was incorporated in the state of Delaware on February 10, 1998, and its facilities are located in South San Francisco, California. Sunesis is a biopharmaceutical company focused on the development and commercialization of new oncology therapeutics for the treatment of solid and hematologic cancers. The Company’s primary activities since incorporation have been conducting research and development internally and through corporate collaborators, in-licensing and out-licensing pharmaceutical compounds and technology, conducting clinical trials and raising capital.

In October 2014, the Company announced the results of a Phase 3, multi-national, randomized, double-blind, placebo-controlled, clinical trial of vosaroxin in combination with cytarabine in patients with relapsed or refractory acute myeloid leukemia (the “VALOR trial”). The trial did not meet its primary endpoint of demonstrating a statistically significant improvement in overall survival. Based upon the results of other predefined analyses of the data and feedback from meetings held in June 2015 with its European Rapporteur and Co-Rapporteur, who are two appointed members of the European Medicines Agency (“EMA”) Committee of Human Medicinal Products, Sunesis plans to file a marketing authorization application (“MAA”) with the EMA as soon as practicable. Based upon a meeting with the U.S. Food and Drug Administration (“FDA”) held in July 2015, the FDA recommended that the Company provide additional clinical evidence prior to any regulatory filing in the U.S. As a result, the Company plans to evaluate regulatory and clinical strategies with the goal of gaining future marketing approval in the U.S.

Significant Risks and Uncertainties

The Company has incurred significant losses and negative cash flows from operations since its inception, and as of June 30, 2015, had cash, cash equivalents and marketable securities totaling $39.6 million and an accumulated deficit of $540.8 million.

The Company will need to raise substantial additional capital to pursue a regulatory strategy for the potential commercialization of QINPREZO^TM(vosaroxin), its product candidate for the potential treatment of acute myeloid leukemia, and to continue the development of vosaroxin and the Company’s other programs. The Company expects to finance its future cash needs primarily through equity issuances, debt arrangements, one or more possible licenses, collaborations or other similar arrangements with respect to development and/or commercialization rights to vosaroxin and its other development programs, or a combination of the above. However, the Company does not know whether additional funding will be available on acceptable terms, or at all. If the Company is unable to raise required funding on acceptable terms or at all, it will need to reduce operating expenses, enter into a collaboration or other similar arrangement with respect to development and/or commercialization rights to vosaroxin, outlicense intellectual property rights to vosaroxin or our other development programs, sell unsecured assets, or a combination of the above, or be forced to delay or reduce the scope of its vosaroxin development program, potentially including any regulatory filings related to the VALOR trial, and/or limit or cease its operations.

Concentrations of Credit Risk

In accordance with its investment policy, the Company invests cash that is not currently being used for operational purposes. The policy allows for the purchase of low risk debt securities issued by: (a) the United States and certain European governments and government agencies, and (b) highly rated banks and corporations, denominated in U.S. dollars, Euros or British pounds, subject to certain concentration limits. The policy limits maturities of securities purchased to no longer than 24 months and the weighted average maturity of the portfolio to 12 months. Management believes these guidelines ensure both the safety and liquidity of any investment portfolio the Company may hold.

Financial instruments that potentially subject the Company to concentrations of credit risk generally consist of cash, cash equivalents and marketable securities. The Company is exposed to credit risk in the event of default by the institutions holding its cash, cash equivalents and any marketable securities to the extent of the amounts recorded in the balance sheets.

2. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and

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Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The financial statements include all adjustments (consisting only of normal recurring adjustments) that management believes are necessary for a fair presentation of the periods presented. The balance sheet as of December 31, 2014 was derived from the audited financial statements as of that date. These interim financial results are not necessarily indicative of results to be expected for the full year or any other period. These unaudited condensed consolidated financial statements and the notes accompanying them should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”), that will supersede most existing revenue recognition guidance under US GAAP. The core principle of the guidance is that an entity should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. Entities can choose to apply the standard using either the full retrospective approach or a modified retrospective approach. Entities electing the full retrospective adoption will apply the standard to each period presented in the financial statements. This means that entities will have to apply the new guidance as if it had been in effect since the inception of all its contracts with customers presented in the financial statements. Entities that elect the modified retrospective approach will apply the guidance retrospectively only to the most current period presented in the financial statements. This means that entities will have to recognize the cumulative effect of initially applying the new standard as an adjustment to the opening balance of retained earnings at the date of initial application. The new revenue standard will be applied to contracts that are in progress at the date of initial application. As currently issued, the standard will be effective for annual and interim periods beginning after December 15, 2016; however in July 2015, the FASB agreed to defer the effective date of the new standard by one year to annual and interim periods beginning after December 15, 2017. The Company has yet to evaluate which adoption method it plans to use or the potential effect of the new standard on its consolidated financial statements.

In August 2014, the FASB issued Accounting Standards Update No. 2014-15, Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern (“ASU 2014-15”), which will require a reporting entity to evaluate, at each annual and interim reporting period, whether there are conditions or events that raise substantial doubt about the reporting entity's ability to continue as a going concern within one year after the date the financial statements are issued and provide related disclosures. The standard will be effective for annual and interim periods beginning after December 15, 2016, with early adoption permitted. The Company has yet to evaluate the potential effect of the new standard on its consolidated financial statements.

Principles of Consolidation

The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries, Sunesis Europe Limited, a United Kingdom corporation, and Sunesis Pharmaceuticals (Bermuda) Ltd., a Bermuda corporation, as well as a Bermuda limited partnership, Sunesis Pharmaceuticals International LP. All intercompany balances and transactions have been eliminated in consolidation.

Segment Reporting

Management has determined that the Company operates as a single reportable segment.

Significant Estimates and Judgments

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the Company’s consolidated financial statements and accompanying notes thereto. Actual results could differ materially from these estimates. Estimates, assumptions and judgments made by management include those related to the valuation of equity and related instruments, revenue recognition, stock-based compensation and clinical trial accounting.

Cash Equivalents and Marketable Securities

Invoices for certain services provided to the Company are denominated in foreign currencies. To manage the risk of future movements in foreign exchange rates that would affect such amounts, the Company may purchase certain European currencies or highly-rated investments denominated in those currencies, subject to similar criteria as for other investments defined in the Company’s investment policy. There is no guarantee that the related gains and losses will substantially offset each other, and the Company may be subject to significant exchange gains or losses as currencies fluctuate from quarter to quarter. To date, the Company has purchased Euros and Euro-denominated obligations of foreign governments and corporate debt. As of June 30, 2015 and December 31, 2014, the Company held cash and investments denominated in Euros with an aggregate fair value of $0.7 million and

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$0, respectively. Any cash, cash equivalent and marketable securities balances denominated in foreign currencies are recorded at their fair value based on the current exchange rate as of each balance sheet date. The resulting exchange gains or losses and those from amounts payable for services originally denominated in foreign currencies are recorded in other income (expense), net in the statements of operations and comprehensive loss.

Fair Value Measurements

The Company measures cash equivalents, marketable securities and warrant liabilities at fair value on a recurring basis using the following hierarchy to prioritize valuation inputs, in accordance with applicable GAAP:

Level 1 - quoted prices (unadjusted) in active markets for identical assets and liabilities that can be accessed at the measurement date.

Level 2 - inputs other than quoted prices included within Level 1 that are observable, either directly or indirectly.

Level 3 - unobservable inputs.

The Company’s Level 2 valuations of marketable securities are generally derived from independent pricing services based upon quoted prices in active markets for similar securities, with prices adjusted for yield and number of days to maturity, or based on industry models using data inputs, such as interest rates and prices that can be directly observed or corroborated in active markets.

The fair value of the Company’s liability for warrants issued in connection with an underwritten offering completed in October 2010 (the “2010 Offering”) is determined using the Black-Scholes model, which requires inputs such as the expected term of the warrants, share price volatility, expected dividend yield and risk-free interest rate. As some of these inputs are unobservable, and require significant analysis and judgment to measure, these variables are classified as Level 3.

The Company does not measure cash, prepayments, accounts payable, accrued liabilities, deferred revenue and notes payable at fair value, as their carrying amounts approximated their fair value as of June 30, 2015 and December 31, 2014.

3. Loss per Common Share

Basic loss per common share is calculated by dividing net loss by the weighted-average number of common shares outstanding for the period. Diluted loss per common share is computed by dividing (a) net loss, less any anti-dilutive amounts recorded during the period for the change in the fair value of warrant liabilities, by (b) the weighted-average number of common shares outstanding for the period plus dilutive potential common shares as determined using the treasury stock method for options and warrants to purchase common stock.

The following table sets forth the computation of basic and diluted loss per common share for the periods presented (in thousands, except per share amounts):

	Three months ended June 30,						Six months ended June 30,
	2015			2014			2015			2014
Numerator:
Net loss—basic	$	(8,949	)	$	(11,781	)	$	(18,077	)	$	(26,354	)
Adjustment for change in fair value of warrant liability		(1,867	)		(333	)		—			—
Net loss—diluted	$	(10,816	)	$	(12,114	)	$	(18,077	)	$	(26,354	)
Denominator:
Weighted-average common shares outstanding—basic		72,513			60,246			70,090			58,291
Dilutive effect of warrants		12			1,649			—			—
Weighted-average common shares outstanding—diluted		72,525			61,895			70,090			58,291
Net loss per common share:
Basic	$	(0.12	)	$	(0.20	)	$	(0.26	)	$	(0.45	)
Diluted	$	(0.15	)	$	(0.20	)	$	(0.26	)	$	(0.45	)

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The following table represents the potential common shares issuable pursuant to outstanding securities as of the related period end dates that were excluded from the computation of diluted loss per common share because their inclusion would have had an anti-dilutive effect (in thousands):

	Three months ended June 30,				Six months ended June 30,
	2015		2014		2015		2014
Warrants to purchase shares of common stock		9,040		16,139		11,960		19,171
Options to purchase shares of common stock		10,422		9,321		10,422		9,321
Restricted stock units		233		—		233		—
Outstanding securities not included in calculations		19,695		25,460		22,615		28,492

4. Financial Instruments

Financial Assets

The following tables summarize the estimated fair value of the Company’s financial assets measured on a recurring basis as of the dates indicated, which were comprised solely of available-for-sale marketable securities with remaining contractual maturities of one year or less (in thousands):

June 30, 2015	Input Level	Amortized Cost			Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Money market funds	Level 1	$	7,422		$	—	$	—		$	7,422
U.S. certificates of deposit	Level 1		8,246			—		—			8,246
U.S. corporate debt obligations	Level 2		8,447			—		(4	)		8,443
U.S. commercial paper	Level 2		3,498			—		(1	)		3,497
Total available-for-sale securities			27,613			—		(5	)		27,608
Less amounts classified as cash equivalents			(8,354	)		—		—			(8,354	)
Amounts classified as marketable securities		$	19,259		$	—	$	(5	)	$	19,254

December 31, 2014	Input Level	Amortized Cost			Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Money market funds	Level 1	$	9,287		$	—	$	—		$	9,287
U.S. certificates of deposit	Level 1		6,360			—		—			6,360
U.S. corporate debt obligations	Level 2		11,789			—		(7	)		11,782
U.S. commercial paper	Level 2		2,898			—		—			2,898
Total available-for-sale securities			30,334			—		(7	)		30,327
Less amounts classified as cash equivalents			(9,532	)		—		—			(9,532	)
Amounts classified as marketable securities		$	20,802		$	—	$	(7	)	$	20,795

The following table summarizes the available-for-sale securities that were in an unrealized loss position as of the date indicated, having been in such a position for less than 12 months, and none having been deemed to be other-than-temporarily impaired (in thousands):

June 30, 2015	Gross Unrealized Losses		Estimated Fair Value
U.S. corporate debt obligations	$	4	$	7,274
U.S. commercial paper		1		2,498
	$	5	$	9,772

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No significant facts or circumstances have arisen to indicate that there has been any deterioration in the creditworthiness of the issuers of these securities. The gross unrealized losses are not considered to be significant and have generally been for relatively short durations. The Company does not intend to sell these securities before maturity and it is not likely that they will need to be sold prior to the recovery of their amortized cost basis. There were no sales of available-for-sale securities during either the six months ended June 30, 2015 or 2014.

Financial Liabilities

The following table summarizes the inputs and assumptions and estimated fair value of the Company’s financial liabilities measured at fair value on a recurring basis as of the dates indicated, which were comprised solely of a liability for warrants issued in connection with the 2010 Offering:

	June 30, 2015			December 31, 2014
Inputs and assumptions:
Fair market value of Company’s common stock	$	3.01		$	2.55
Exercise price	$	2.52		$	2.52
Expected term (years)		0.3			0.8
Expected volatility		52.2	%		144.9	%
Risk-free interest rate		0.02	%		0.19	%
Expected dividend yield		0.00	%		0.00	%
Fair value:
Estimated fair value per warrant share	$	0.60		$	1.21
Shares underlying outstanding warrants classified as    liabilities (in thousands)		2,920			2,920
Total estimated fair value of outstanding warrants    (in thousands)	$	1,765		$	3,543

The warrants have been classified as a liability on the Company’s balance sheet due to the potential for the warrants to be settled in cash upon the occurrence of certain transactions specified in the warrant agreements. At each balance sheet date, the estimated fair value of the outstanding warrants is determined using the Black-Scholes model and recorded to the balance sheet, with the change in fair value recorded to other income (expense), net in the statements of operations and comprehensive loss, and the fair value of warrant exercises transferred to additional paid-in capital. During the six months ended June 30, 2015, no warrants to purchase shares of common stock issued in connection with the 2010 Offering were exercised.

The Black-Scholes model requires Level 3 inputs such as the expected term of the warrants and share price volatility. These inputs are subjective and generally require significant analysis and judgment to develop. Any changes in these inputs could result in a significantly higher or lower fair value measurement.

The following table summarizes the changes in the fair value of the Company’s Level 3 financial liabilities for the period indicated (in thousands):

	Warrant Liability
Balance as of December 31, 2014	$	3,543
Change in fair value of warrant liability		(1,778	)
Exercise of warrants		—
Balance as of June 30, 2015	$	1,765

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5. Royalty Agreement

In March 2012, the Company entered into a Revenue Participation Agreement (the “Royalty Agreement”), with RPI Finance Trust (“RPI”), an entity related to Royalty Pharma. In September 2012, pursuant to the provisions of the Royalty Agreement, RPI made a $25.0 million cash payment to the Company. The payment, less $3.1 million representing the fair value of the warrants granted under the arrangement, was initially classified as deferred revenue and is being amortized to revenue over the related performance period.

Revenue participation right payments will be made to RPI when and if vosaroxin is commercialized, at a rate of 6.75% of net sales of vosaroxin, on a product-by-product and country-by-country basis world-wide through the later of: (a) the expiration of the last to expire of certain specifically identified patents; (b) 10 years from the date of first commercial sale of such product in such country; or (c) the expiration of all applicable periods of data, market or other regulatory exclusivity in such country with respect to such product.

6. License Agreements

Biogen Idec

In December 2013, the Company entered into a second amended and restated collaboration agreement with Biogen Idec MA, Inc. (the “Biogen Idec 2nd ARCA”), to provide the Company with an exclusive worldwide license to develop, manufacture and commercialize SNS-062, a BTK inhibitor synthesized under the first amended and restated collaboration agreement with Biogen Idec (the “Biogen Idec 1st ARCA”), solely for oncology indications. The Company may be required to make a $2.5 million milestone payment depending on its development of SNS-062 and royalty payments depending on related product sales of SNS-062. All other of Sunesis’ rights and obligations contained in the Biogen Idec 1st ARCA remain unchanged, except that potential future royalty payments to Sunesis were reduced to equal those amounts due to Biogen Idec for potential future sales of SNS-062.

Millennium

In March 2011, Millennium Pharmaceuticals, Inc., a wholly-owned subsidiary of Takeda Pharmaceutical Company Limited (“Millennium”) purchased and exclusively licensed Biogen Idec’s rights to a PDK1 inhibitor program and a pan-Raf inhibitor program which were both originally developed through a collaboration agreement between Sunesis and Biogen Idec. In January 2014, the Company entered into an amended and restated license agreement with Millennium (the “Amended Millennium Agreement”), to provide the Company with an exclusive worldwide license to develop and commercialize preclinical inhibitors of PDK1. In connection with the execution of the Amended Millennium Agreement, the Company paid an upfront fee and may be required to make up to $9.2 million in pre-commercialization milestone payments depending on its development of PDK1 inhibitors and royalty payments depending on related product sales, if any.

With respect to the pan-Raf inhibitor program, the Company may in the future receive up to $57.5 million in pre-commercialization event-based payments related to the development by Millennium of the first two indications for each of the licensed products directed against the Raf target and royalty payments depending on related product sales. Under this program, Millennium is currently conducting Phase 1 clinical studies of an oral investigative drug, MLN2480.

7. Notes Payable

In October 2011, the Company entered into a Loan and Security Agreement (the “Loan Agreement”) with Oxford Finance LLC, Silicon Valley Bank and Horizon Technology Finance Corporation (collectively, the “Lenders”), under which the Company could borrow up to $25.0 million in two tranches (the “Loan Facility”). The first tranche of $10.0 million was funded upon closing of the transaction in October 2011, and the second tranche of $15.0 million was drawn by the Company in September 2012. In connection with the Loan Agreement, the Lenders were granted a perfected first priority security interest in substantially all of the Company’s assets, other than intellectual property.

The interest rates for the first and second tranche are 8.95% and 9.00% per annum, respectively. Payments under the Loan Agreement are monthly in arrears and were interest-only until February 1, 2013, and were to be followed by 32 equal monthly payments of principal and interest from March 1, 2013 to the original maturity date of October 1, 2015. In addition, a final payment equal to $937,500 was to be due on October 1, 2015, or such earlier date as specified in the Loan Agreement.

On February 27, 2015, the Company entered into an amendment (the “Amendment”), to the Loan Agreement with the Lenders. The Amendment modifies the loan repayment terms to be interest-only from March 1, 2015 to February 1, 2016, followed by eight equal monthly payments of principal and interest through the new maturity date of October 1, 2016. In addition, the final payment was increased to $1,162,500, and will become due on the new maturity date, or such earlier date specified in the Loan Agreement. If the

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Company repays all or a portion of the loan prior to February 29, 2016 as part of a refinancing with another lender, a prepayment fee equal to 2% of the then outstanding principal balance will be due to the Lenders. The remaining balance of the final payment that has yet to be expensed is being accreted as interest expense through the new maturity date using the effective interest method.

In connection with the Amendment, the Lenders were issued five-year warrants to purchase an aggregate of up to 61,467 shares of the Company’s common stock at a per share exercise price of $2.22. The fair value of these warrants was estimated to be $0.1 million using the Black-Scholes valuation model. The fair value of these warrants was recorded at issuance as a debt discount within notes payable and an increase to additional paid-in capital on the Company’s balance sheet. The balance of the debt discount, including the fair value of these warrants, is being amortized as interest expense over the remaining term of the Loan Agreement, as amended, using the effective interest method.

The weighted average annual effective interest rate of the notes payable under the revised amortization schedule is 13.8%.

Aggregate future minimum payments due under the Loan Agreement as of June 30, 2015 were as follows (in thousands):

Year ending December 31,	Total
2015	$	306
2016		7,154
Total minimum payments		7,460
Less amount representing interest		(640	)
Notes payable, gross		6,820
Unamortized discount on notes payable		(114	)
Accretion of final payment		968
Notes payable, balance		7,674
Less current portion of notes payable		(3,253	)
Non-current portion of notes payable	$	4,421

8. Stockholders’ Equity

Controlled Equity Offerings

In August 2011, the Company entered into a Controlled Equity Offering^SM sales agreement (the “Sales Agreement”), with Cantor Fitzgerald & Co. (“Cantor”), as agent and/or principal, pursuant to which the Company could issue and sell shares of its common stock having an aggregate gross sales price of up to $20.0 million. In April 2013, the Sales Agreement was amended to provide for an increase of $30.0 million in the aggregate gross sales price under the Sales Agreement. In March 2015, the Sales Agreement was further amended to provide for an additional increase of $30.0 million in the aggregate gross sales price under the Sales Agreement. The Company will pay Cantor a commission of up to 3.0% of the gross proceeds from any common stock sold through the Sales Agreement, as amended.

During the six months ended June 30, 2015, the Company sold 6,834,978 shares of common stock under the Sales Agreement, as amended, at an average price of approximately $2.65 per share for gross proceeds of $18.1 million and net proceeds of $17.7 million, after deducting Cantor’s commission. As of June 30, 2015, $18.7 million of common stock remained available to be sold under this facility, subject to certain conditions as specified in the Sales Agreement, as amended.

In July 2015, the Company has sold 124,100 shares of common stock under the Sales Agreement, as amended, at $3.70 per share for gross proceeds of $0.5 million and net proceeds of $0.4 million, after deducting Cantor’s commission. As of July 30, 2015, $18.2 million of common stock remains available to be sold under this facility.

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9. Stock-Based Compensation

Employee stock-based compensation expense is calculated based on the grant-date fair value of awards ultimately expected to vest, and is recorded on a straight-line basis over the vesting period of the awards. Forfeitures are estimated at the time of grant, based on historical option cancellation information, and revised in subsequent periods if actual forfeitures differ from those estimates.

The following table summarizes stock-based compensation expense related to the Company’s stock-based awards for the periods indicated (in thousands):

	Three months ended June 30,				Six months ended June 30,
	2015		2014		2015		2014
Research and development	$	595	$	519	$	1,293	$	978
General and administrative		718		837		1,876		1,564
Employee stock-based compensation expense		1,313		1,356		3,169		2,542
Non-employee stock-based compensation expense		55		108		163		228
Total stock-based compensation expense	$	1,368	$	1,464	$	3,332	$	2,770

10. Subsequent Events

In July 2015, the Company has sold 124,100 shares of common stock under the Sales Agreement, as amended, at $3.70 per share for gross proceeds of $0.5 million and net proceeds of $0.4 million, after deducting Cantor’s commission. See Note 8 for further details.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion and analysis of our financial condition as of June 30, 2015 and results of operations for the three and six months ended June 30, 2015 should be read together with our condensed consolidated financial statements and related notes included elsewhere in this Quarterly Report on Form 10-Q and in our other Securities and Exchange Commission, or SEC, filings, including our Annual Report on Form 10-K for the year ended December 31, 2014, filed with the SEC on March 12, 2015.

This discussion and analysis contains “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, Section 21E of the Securities Exchange Act of 1934, as amended, or the Exchange Act, and the Private Securities Litigation Reform Act of 1995, which involve risks, uncertainties and assumptions. All statements, other than statements of historical facts, are “forward-looking statements” for purposes of these provisions, including without limitation any statements relating to our strategy, including, regulatory plans to file a marketing authorization application with the European Medicines Agency, our goal of gaining marketing approval in the U.S., our preliminary analysis, assessment and conclusions of the results of the VALOR trial, and the commercial potential of vosaroxin, our ability to gain approval to market vosaroxin in the U.S., presenting clinical data and initiating clinical trials, our future research and development activities, including clinical testing and the costs and timing thereof, sufficiency of our cash resources, our ability to raise additional funding when needed, any statements concerning anticipated regulatory activities or licensing or collaborative arrangements, our research and development and other expenses, our operations and legal risks, and any statement of assumptions underlying any of the foregoing. In some cases, forward-looking statements can be identified by the use of terminology such as “anticipates,” “believe,” “continue,” “estimates,” “expects,” “goal,” “hopes,” “intend,” “look forward,” “may,” “could,” “seeks,” “plans,” “potential,” or “will” or the negative thereof or other comparable terminology. Although we believe that the expectations reflected in the forward-looking statements contained herein are reasonable, there can be no assurance that such expectations or any of the forward-looking statements will prove to be correct, and actual results could differ materially from those projected or assumed in the forward-looking statements. Our actual results may differ materially from those anticipated in these forward-looking statements as a result of many factors, including but not limited to those set forth under “Risk Factors,” and elsewhere in this report. We urge you not to place undue reliance on these forward-looking statements, which speak only as of the date of this report. All forward-looking statements included in this report are based on information available to us on the date of this report, and we assume no obligation to update any forward-looking statements contained in this report.

In this report, “Sunesis,” the “Company,” “we,” “us,” and “our” refer to Sunesis Pharmaceuticals, Inc. and its wholly-owned subsidiaries, except where it is made clear that the term means only the parent company.

Overview

We are a biopharmaceutical company focused on the development and commercialization of our pipeline of new oncology therapeutics for the potential treatment of solid and hematologic cancers. Our most advanced program is QINPREZO^TM (vosaroxin), our product candidate for the potential treatment of acute myeloid leukemia, or AML.

In October 2014, we announced the results of a Phase 3, multi-national, randomized, double-blind, placebo-controlled trial of vosaroxin in combination with cytarabine in patients with relapsed or refractory AML, or the VALOR trial. The VALOR trial, which enrolled 711 adult patients, was designed to evaluate the effect of vosaroxin in combination with cytarabine, a widely used chemotherapy in AML, on overall survival as compared to placebo in combination with cytarabine, and was conducted at 124 study sites in 15 countries. Patients treated with vosaroxin achieved increased overall survival compared to those treated with placebo (7.5 months vs 6.1 months, HR=0.87), the primary endpoint, but this difference did not achieve statistical significance (p=0.06). The complete remission (CR) rate, the sole secondary efficacy endpoint in the trial, did demonstrate a significant difference for the vosaroxin combination arm (30.1% vs 16.3%, p < 0.0001). Detailed results of the VALOR trial were presented in the "Late Breaking Abstracts" session of the American Society of Hematology (ASH) Annual Meeting in December 2014.

In November 2014, based on the results of the VALOR trial, we submitted a letter of intent to the European Medicines Agency, or EMA, describing our intention to file a marketing authorization application, or MAA, for marketing authorization of vosaroxin plus cytarabine for the treatment of relapsed or refractory AML. In June 2015, we met separately with our Rapporteur and Co-Rapporteur, who are two appointed members of the EMA’s Committee of Human Medicinal Products. Based upon feedback from these meetings, we plan to file an MAA with the EMA as soon as practicable. In July 2015, we met with the U.S. Food and Drug Administration, or FDA, to discuss a potential regulatory filing in the U.S. Based upon the meeting, the FDA recommended that we provide additional clinical evidence prior to any regulatory filing in the U.S. As a result, we will evaluate regulatory and clinical strategies with the goal of gaining future marketing approval in the U.S.

In December 2014, updated results from the ongoing Phase 1b/2 MDACC-sponsored trial of vosaroxin in combination with decitabine in older patients with previously untreated AML and high-risk MDS were presented at the ASH Annual Meeting. This trial is now close to full enrollment, and an abstract is being prepared for submission to the 2015 ASH Annual Meeting.

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In January 2014, we announced the expansion of our oncology pipeline through separate global licensing agreements for two preclinical kinase inhibitor programs. The first agreement, with Biogen Idec MA, Inc., or Biogen Idec, is for global commercial rights to SNS-062, a selective non-covalently binding oral inhibitor of BTK. We plan to filea Clinical Trial Authorization, or CTA, application with the EMAthis fall to support a Phase 1A study of SNS-062 in healthy volunteers.

The second agreement, with Millennium Pharmaceuticals, Inc., a wholly-owned subsidiary of Takeda Pharmaceutical Company Limited, or Millennium, is for global commercial rights to several potential first-in class, pre-clinical inhibitors of the novel target PDK1. In 2014, we selected two PDK1 inhibitors, SNS-229 and SNS-510, of which we plan to take at least one into IND-enabling absorption, distribution, metabolism and excretion, or ADME, and safety studies in 2015.

Both BTK and PDK1 programs were originally developed under a research collaboration agreement between Biogen Idec and Sunesis. In 2011, the PDK1 program was purchased by and exclusively licensed to Millennium along with the more advanced program, MLN2480, an oral pan-RAF inhibitor, for which Millennium recently initiated a multi-arm, open-label Phase 1B study in combination with MLN0128, an oral mTORC 1/2 inhibitor; alisertib, an oral aurora A kinase inhibitor; or paclitaxel, in adult patients with advanced non-hematologic malignancies. We currently expect SNS-062 and the PDK1 inhibitors will be developed exclusively by Sunesis.

Recent Financial History

Controlled Equity Offerings

In August 2011, we entered into a Controlled Equity Offering^SM sales agreement, or the Sales Agreement, with Cantor Fitzgerald & Co., or Cantor, as agent and/or principal, pursuant to which we could issue and sell shares of our common stock having an aggregate gross sales price of up to $20.0 million. In April 2013, the Sales Agreement was amended to provide for an increase of $30.0 million in the aggregate gross sales price under the Sales Agreement. In March 2015, the Sales Agreement was further amended to provide for an additional increase of $30.0 million in the aggregate gross sales price under the Sales Agreement. We will pay Cantor a commission of up to 3.0% of the gross proceeds from any common stock sold through the Sales Agreement, as amended.

During the second quarter of 2015, we sold an aggregate of 2,904,635 shares of common stock under the Sales Agreement, as amended, at an average price of approximately $2.69 per share for gross proceeds of $7.8 million and net proceeds of $7.7 million, after deducting Cantor’s commission. In July 2015, we have sold 124,100 shares of common stock under this facility at $3.70 per share for gross proceeds of $0.5 million and net proceeds of $0.4 million. As of July 30, 2015, $18.2 million of common stock remains available to be sold under the Sales Agreement, as amended, subject to certain conditions as specified in the agreement.

Loan Agreement

In October 2011, we entered into the Loan and Security Agreement, or the Loan Agreement, with Oxford Finance LLC, Silicon Valley Bank and Horizon Technology Finance Corporation, or collectively, the Lenders, and received the first tranche of $10.0 million from the Lenders. In September 2012, we drew the second tranche of $15.0 million from the Lenders. Payments under both tranches were interest-only until February 1, 2013, with the following 32 equal monthly payments of principal and interest being paid monthly in arrears through the scheduled maturity date of October 1, 2015. On February 27, 2015, the Loan Agreement was amended to provide for an interest-only period from March 1, 2015 to February 1, 2016, such that the eight remaining principal payments will be deferred and re-amortized over the period from March 1, 2016 to October 1, 2016.

Capital Requirements

We have incurred significant losses in each year since our inception. As of June 30, 2015, we had cash, cash equivalents and marketable securities of $39.6 million and an accumulated deficit of $540.8 million. We expect to continue to incur significant losses for the foreseeable future as we continue the development process and seek regulatory approvals for vosaroxin.

We will need to raise substantial additional capital to complete the development and potential commercialization of vosaroxin, and expect to finance our future cash needs primarily through equity issuances, debt arrangements, one or more possible licenses, collaborations or other similar arrangements with respect to development and/or commercialization rights to vosaroxin, or a combination of the above. However, we do not know whether additional funding will be available on acceptable terms, or at all. If we are unable to raise required funding on acceptable terms or at all, we will need to reduce operating expenses, enter into a collaboration or other similar arrangement with respect to development and/or commercialization rights to vosaroxin, outlicense intellectual property rights to vosaroxin or our other development programs, sell unsecured assets, or a combination of the above, or be forced to delay or reduce the scope of our vosaroxin development program, potentially including any regulatory filings related to the VALOR trial, and/or limit or cease our operations.

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Critical Accounting Policies and Significant Judgments and Estimates

There have been no significant changes during the six months ended June 30, 2015 to our critical accounting policies and significant judgments and estimates as disclosed in our management’s discussion and analysis of financial condition and results of operations included in our Annual Report on Form 10-K for the year ended December 31, 2014.

Overview of Revenues

We have not generated any revenue from the sale of commercial products, and do not anticipate product sales until at least 2016, if at all. Over the past three years, we have generated revenue primarily through the Royalty Agreement with RPI.

Overview of Operating Expenses

Research and Development expense. Research and development expense consists primarily of clinical trial costs, which include: payments for work performed by our contract research organizations, clinical trial sites, labs and other clinical service providers and for drug packaging, storage and distribution; drug manufacturing costs, which include costs for producing drug substance and drug product, and for stability and other testing; personnel costs, including non-cash stock-based compensation; other outside services and consulting costs; and payments under license agreements. We expense all research and development costs as they are incurred.

We are currently focused on the development of vosaroxin for the treatment of AML. Based on results of translational research, our own and investigator-sponsored trials, regulatory and competitive concerns and our overall financial resources, we anticipate that we will make determinations as to which indications to pursue and patient populations to treat in the future, and how much funding to direct to each indication, which will affect our research and development expense. If we proceed to commercialization following the approval of either an MAA filing with the EMA or a New Drug Application, or NDA, filing with the FDA, research and development costs may increase in the future. Due to the above uncertainties and other risks inherent in the development process, we are unable to estimate the costs we will incur in the vosaroxin development program in the future.

If we engage a development or commercialization partner for our vosaroxin program, or if, in the future, we acquire additional product candidates, our research and development expenses could be significantly affected. We cannot predict whether future licensing or collaborative arrangements will be secured, if at all, and to what degree such arrangements would affect our development plans and capital requirements.

We anticipate continuing expenditures associated with advancing the SNS-062 and PDK1 programs in 2015 and beyond. Additionally, under the Millennium Agreement, we have the right to participate in co-development and co-promotion activities for the related product candidates, including MLN2480, an oral pan-RAF inhibitor currently in Phase 1 clinical studies being conducted by Millennium. If we were to exercise our option on this or other product candidates, our research and development expense would increase significantly.

General and Administrative expense. General and administrative expense consists primarily of personnel costs for the related employees, including non-cash stock-based compensation; professional service costs, including fees paid to outside legal advisors, marketing consultants and our independent registered public accounting firm; facilities expenses; and other administrative costs. If we proceed to commercialization in either Europe or the United States following planned and potential regulatory filings with the EMA and FDA, respectively, we anticipate general and administrative expenses to increase in the future, including additional costs related to selling and marketing.

Results of Operations

Revenue

Total revenue was $0.9 million and $1.7 million for the three and six months ended June 30, 2015 as compared to $2.0 million and $4.0 million for the same periods in 2014. Revenue in each period was primarily due to deferred revenue recognized related to the Royalty Agreement with RPI. We expect deferred revenue recognized under this arrangement to be lower in 2015 than in 2014 due to the estimated performance period through which the remaining balance of deferred revenue will be amortized.  

Research and Development Expense

Research and development expense was $6.3 million and $10.8 million for the three and six months ended June 30, 2015 as compared to $7.2 million and $14.8 million for the same periods in 2014, primarily relating to the vosaroxin development program in each period. The decrease of $0.9 million between the comparable three month periods was primarily due to a reduction of $1.3 million in clinical trial expenses, partially offset by increases of $0.2 million in personnel costs and $0.2 million in drug

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manufacturing and other outside services costs. The decrease of $3.9million between the comparable six month periods was primarily due to reductions of $3.5 million in clinical trial expenses and $0.5 million in drug manufacturing and other outside services costs.

General and Administrative Expense

General and administrative expense was $5.2 million and $10.3 million for the three and six months ended June 30, 2015 as compared to $6.4 million and $9.8 million for the same periods in 2014. The decrease of $1.2 million between the comparable three month periods was primarily due to decreases of $0.6 million in personnel costs and $0.6 million in outside services costs. The increase of $0.5 million between the comparable six month periods was primarily due to increases in outside services costs.

Interest Expense

Interest expense was $0.2 million and $0.5 million for the three and six months ended June 30, 2015 as compared to $0.5 million and $1.0 million for the same periods in 2014. The decreases in the 2015 periods were due to the reduced principal balance outstanding on notes payable.

Other Income (Expense), Net

Net other income was $1.9 million and $1.8 million for the three and six months ended June 30, 2015 as compared to $0.3 million of net other income and $4.8 million of net other expense for the same periods in 2014. The amounts for each period were primarily comprised of non-cash credits or charges for the revaluation of warrants issued in the October 2010 underwritten offering.

Liquidity and Capital Resources

Sources of Liquidity

Since our inception, we have funded our operations primarily through the issuance of common and preferred stock and other equity instruments, debt financings, receipts from our collaboration partners, the sale of revenue participation rights, and research grants.

Our cash, cash equivalents and marketable securities totaled $39.6 million as of June 30, 2015, as compared to $43.0 million as of December 31, 2014. The decrease of $3.4 million was primarily due to $19.8 million of net cash used in operating activities and $1.6 million of principal payments against notes payable, partially offset by $18.0 million raised from sales of our common stock through the Sales Agreement with Cantor and the exercise of warrants, stock options and stock purchase rights.

In August 2011, we entered into the Sales Agreement, with Cantor as agent and/or principal, pursuant to which we could issue and sell shares of our common stock having an aggregate gross sales price of up to $20.0 million. In April 2013, the Sales Agreement was amended to provide for an increase of $30.0 million in the aggregate gross sales price under the Sales Agreement. In March 2015, the Sales Agreement was further amended to provide for an additional increase of $30.0 million in the aggregate gross sales price under the Sales Agreement. We will pay Cantor a commission of up to 3.0% of the gross proceeds from any common stock sold through the Sales Agreement, as amended.

During the six months ended June 30, 2015, we sold an aggregate of 6,834,978 shares of common stock under the Sales Agreement, as amended, at an average price of approximately $2.65 per share for gross proceeds of $18.1 million and net proceeds of $17.7 million, after deducting Cantor’s commission. In July 2015, we have sold 124,100 shares of common stock under this facility at $3.70 per share for gross proceeds of $0.5 million and net proceeds of $0.4 million. As of July 30, 2015, $18.2 million of common stock remains available to be sold under this facility, subject to certain conditions as specified in the agreement.

Cash Flows

Net cash used in operating activities was $19.8 million for the six months ended June 30, 2015, as compared to $21.6 million for the same period in 2014. Net cash used in the 2015 period resulted primarily from the net loss of $18.1 million and changes in operating assets and liabilities of $3.4 million, partially offset by net adjustments for non-cash items of $1.7 million. Net cash used in the 2014 period resulted primarily from the net loss of $26.4 million and changes in operating assets and liabilities of $2.9 million, partially offset by net adjustments for non-cash items of $7.6 million.

Net cash provided by investing activities was $1.5 million for the six months ended June 30, 2015, as compared to $7.6 million used in investing activities for the same period in 2014. Net cash provided in the 2015 period consisted primarily of proceeds from maturities of marketable securities, partially offset by purchases of marketable securities. Net cash used in the 2014 period consisted primarily of purchases of marketable securities, partially offset by proceeds from maturities of marketable securities.

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Net cash provided by financing activities was $16.4 million for the sixmonths ended June 30, 2015, as compared to $40.9 million for the same period in 2014. Net cash provided in the 2015 period resulted primarily from net proceeds of $17.7 million from sales of our common stock through the Sales Agreement with Cantor and $0.3 million from the exercise of warrants, stock options and stock purchase rights, partially offset by $1.6 million of principal payments against notes payable. Net cash provided in the 2014 period resulted primarily from net proceeds of $40.0 million from an underwritten equity offering, $4.7 million from sales of our common stock through the Sales Agreement with Cantor, and $0.7million from the exercise of warrants, stock options and stock purchase rights, partially offset by $4.6 million of principal payments against notes payable.

Operating Capital Requirements

We expect to continue to incur substantial operating losses in the future. We will not receive any product revenue until a product candidate has been approved by the EMA, FDA, or similar regulatory agencies in other countries, and has been successfully commercialized, if at all. We will need to raise substantial additional funding to complete the development and potential commercialization of vosaroxin. Additionally, we may evaluate in-licensing and acquisition opportunities to gain access to new drugs or drug targets that would fit with our strategy. Any such transaction would likely increase our funding needs in the future.

Our future funding requirements will depend on many factors, including but not limited to:

· the rate of progress and cost of our clinical trials;

· the need for additional or expanded clinical trials;

· the timing, economic and other terms of any licensing, collaboration or other similar arrangement into which we may enter;

· the costs and timing of seeking and obtaining EMA, FDA, or other regulatory approvals;

· the extent of our other development activities, including our in-license agreements;

· the costs associated with building or accessing commercialization and additional manufacturing capabilities and supplies;

· the costs of acquiring or investing in businesses, product candidates and technologies, if any;

· the costs of filing, prosecuting, defending and enforcing any patent claims and other intellectual property rights;

· the effect of competing technological and market developments; and

· the costs, if any, of supporting our arrangements with Biogen Idec and Millennium.

We believe that we currently have the resources to fund our operations to the middle of 2016. We will need to raise substantial additional capital to complete the development and potential commercialization of vosaroxin. Until we can generate a sufficient amount of licensing or collaboration or product revenue to finance our cash requirements, which we may never do, we expect to finance our future cash needs primarily through equity issuances, debt arrangements, one or more possible licenses, collaborations or other similar arrangements with respect to development and/or commercialization rights to vosaroxin, or a combination of the above.

Our failure to raise significant additional capital in the future would force us to delay or reduce the scope of our vosaroxin development program, potentially including any additional clinical trials or regulatory filings in Europe or the United States, and/or limit or cease our operations. Any one of the foregoing would have a material adverse effect on our business, financial condition and results of operations.

Contractual Obligations

The following table summarizes our long-term contractual obligations as of June 30, 2015 (in thousands):

	Payments Due by Period
	Total		Less Than 1 Year		1-3 Years		3-5 Years		After 5 Years
Long-term debt obligations(1)	$	8,623	$	3,934	$	4,689	$	—	$	—
Operating lease obligations(2)	$	264	$	264	$	—	$	—	$	—

(1) Includes interest and a final payment of $1,162,500 under the Loan Agreement, which becomes due on October 1, 2016, or such earlier date specified in the Loan Agreement. Upon the occurrence of an event of default, as defined in the Loan Agreement, and following any applicable cure periods, a default interest rate of an additional 5% may be applied to the outstanding loan balances, and the Lenders may declare all outstanding obligations immediately due and payable and take such other actions as

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set forth in the Loan Agreement. If we repay all or a portion of the loan prior to February 29, 2016 as part of a refinancing with another lender, a prepayment fee equal to 2% of the then outstanding principal balance will be due to the Lenders.

(2) Operating lease obligations relate solely to the leasing of office space in a building at 395 Oyster Point Boulevard in South San Francisco, California, which is currently our corporate headquarters. In January 2014, a lease for 15,378 square feet was entered into with an expiration date of April 30, 2015. In June 2014, the lease was amended to extend the expiration date to June 30, 2015, and to add 6,105 square feet of additional office space within the same building. In January 2015, the lease was further amended to extend the expiration date to December 31, 2015.

The above amounts exclude potential payments under:

· our 2003 license agreement with Sumitomo Dainippon Pharma Co., Ltd., or Sumitomo, pursuant to which we are required to make certain milestone payments in the event we file new drug applications in the United States, Europe or Japan, and if we receive regulatory approvals in any of these regions, for cancer-related indications. If vosaroxin is approved for a non-cancer indication, an additional milestone payment becomes payable to Sumitomo. We are also required to make royalty payments to Sumitomo in the event that vosaroxin is commercialized.

· our Royalty Agreement with RPI, pursuant to which we are required to make certain revenue participation payments in the event that vosaroxin is commercialized.

· our December 2013 second amended and restated collaboration agreement with Biogen Idec and our January 2014 amended license agreement with Millennium, pursuant to which we are required to make certain milestone and royalty payments.

We also have agreements with contract research organizations clinical sites and other third party contractors for the conduct of our clinical trials. We generally make payments to these entities based upon the activities they perform related to the particular clinical trial. There are generally no penalty clauses for cancellation of these agreements if notice is duly given and payment is made for work performed by the third party under the related agreement.

Off-Balance Sheet Arrangements

Since our inception, we have not had any off-balance sheet arrangements or relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or variable interest entities, which are typically established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

Interest Rate and Market Risk

As of June 30, 2015 and December 31, 2014, we had $39.6 million and $43.0 million, respectively, in cash, cash equivalents and marketable securities. The securities in our investment portfolio are not leveraged and are classified as available-for-sale, which, due to their short-term nature, are subject to minimal interest rate risk. We currently do not hedge our interest rate risk exposure. Because of the short-term maturities of our investments, we do not believe that a change in market rates would have a significant impact on the value of our investment portfolio.

The primary objective of our investment activities is to preserve capital while at the same time maximizing the income we receive from our investments without significantly increasing risk. To achieve this objective, we maintain our portfolio of cash equivalents and short-term and long-term investments in a variety of highly rated securities, which may include money market funds and U.S. and European government obligations and corporate debt obligations (including certificates of deposit, corporate notes and commercial paper). These securities are classified as available for sale and consequently are recorded on the balance sheet at fair value with unrealized gains or losses reported as a separate component of accumulated other comprehensive income (loss). In the past, we have generally purchased investments with an original maturity of less than one year, although our policy allows for the purchase of securities with a maturity of up to two years. Our holdings of the securities of any one corporate issuer do not exceed 10% of the portfolio at the time of purchase. If interest rates rise, the market value of our investments may decline, which could result in a realized loss if we are forced to sell an investment before its scheduled maturity. We do not utilize derivative financial instruments to manage our interest rate risks.

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The tables below present the original principal amounts and weighted-average interest rates by maturity period for our investment portfolio as of the dates indicated (in thousands, except percentages):

	Expected Maturity						Total
	0-3 months			Over 3 months			Fair Value as of June 30, 2015
Available-for-sale securities	$	19,361		$	8,247		$	27,608
Average interest rate		0.2	%		0.3	%

	Expected Maturity						Total
	0-3 months			Over 3 months			Fair Value as of December 31, 2014
Available-for-sale securities	$	17,260		$	13,067		$	30,327
Average interest rate		0.2	%		0.3	%

Foreign Currency Exchange Rate Risk

We consider our direct exposure to foreign exchange rate fluctuations to be minimal. Invoices for certain services provided to us are denominated in foreign currencies, including the Euro and British pound, among others. Therefore, we are exposed to adverse movements in the related foreign currency exchange rates. To manage this risk, we may purchase certain European currencies or highly-rated investments denominated in those currencies, subject to similar criteria as for other investments allowed by our investment policy. We do not make these purchases for trading or speculative purposes, and there is no guarantee that the related gains and losses will substantially offset each other.

As of June 30, 2015 and December 31, 2014, we held cash and investments denominated in Euros with an aggregate fair value of $0.7 million and $0, respectively. The balances are recorded at their fair value based on the current exchange rate as of each balance sheet date. The resulting exchange gains or losses and those from amounts payable for services originally denominated in foreign currencies are recorded in other income (expense), net in the statements of operations and comprehensive loss.

Item 4. Controls and Procedures

Evaluation of Disclosure Controls and Procedures

We maintain disclosure controls and procedures, as such term is defined in SEC Exchange Act Rule 13a-15(e), that are designed to ensure that information required to be disclosed in our reports under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow for timely decisions regarding required disclosure. In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and management is required to apply its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

As required by SEC Exchange Act Rule 13a-15(b), we carried out an evaluation, under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures as of the end of the period covered by this Quarterly Report on Form 10-Q. Based on the foregoing, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures were effective at the reasonable assurance level as of the end of the period covered by this Quarterly Report on Form 10-Q.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting during the quarter ended June 30, 2015 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1. Legal Proceedings

From time to time, we may be involved in routine legal proceedings, as well as demands, claims and threatened litigation, which arise in the normal course of our business. The ultimate outcome of any litigation is uncertain and unfavorable outcomes could have a negative impact on our results of operations and financial condition. Regardless of outcome, litigation can have an adverse impact on us because of the defense costs, diversion of management resources and other factors.

We believe there is no litigation pending that could, individually or in the aggregate, have a material adverse effect on our results of operations or financial condition.

Item  1A. Risk Factors

Investing in our common stock involves a high degree of risk. You should carefully consider the risks and uncertainties described below and all information contained in this Quarterly Report on Form 10-Q, as each of these risks could adversely affect our business, operating results and financial condition. If any of the possible adverse events described below actually occurs, we may be unable to conduct our business as currently planned and our financial condition and operating results could be harmed. In addition, the trading price of our common stock could decline due to the occurrence of any of these risks, and you may lose all or part of your investment.

Please see the language regarding forward-looking statements in “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

We have marked with an asterisk (*) those risk factors below that reflect substantive changes from the risk factors included in our Annual Report on Form 10-K for the year ended December 31, 2014 that was filed with the SEC on March 12, 2015. Furthermore, the risk factor entitled “Economic conditions may make it costly and difficult to raise additional capital.” that appeared in the Form 10-K has been removed.

Risks Related to Our Business

We need to raise substantial additional funding to pursue our regulatory strategy for the potential commercialization of QINPREZO^TM (vosaroxin), and to continue the development of vosaroxin and our other programs.*

We believe that with $39.6 million in cash and investments held as of June 30, 2015, we currently have the resources to fund our operations to the middle of 2016.

However, we will need to raise substantial additional capital to:

· complete the development, regulatory strategy and potential commercialization of vosaroxin in AML in Europe and the United States;

· fund additional clinical trials of vosaroxin and seek regulatory approvals, including additional clinical evidence the FDA recommended that we provide prior to any regulatory filing for vosaroxin in the United States;

· expand our development activities;

· implement additional internal systems and infrastructure; and

· build or access commercialization and additional manufacturing capabilities and supplies.

Our future funding requirements and sources will depend on many factors, including but not limited to the:

· rate of progress and cost of our clinical trials;

· need for additional or expanded clinical trials;

· timing, economic and other terms of any licensing, collaboration or other similar arrangement into which we may enter;

· costs and timing of seeking and obtaining EMA, FDA, or other regulatory approvals;

· extent of our other development activities, including our other clinical programs and in-license agreements;

· costs associated with building or accessing commercialization and additional manufacturing capabilities and supplies;

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· costs of acquiring or investing in businesses, product candidates and technologies, if any;

· costs of filing, prosecuting, defending and enforcing any patent claims and other intellectual property rights;

· effect of competing technological and market developments; and

· costs of supporting our arrangements with Biogen Idec, Millennium or any potential future licensees or partners.

Until we can generate a sufficient amount of licensing, collaboration or product revenue to finance our cash requirements, which we may never do, we expect to finance future cash needs primarily through equity issuances, debt arrangements, one or more possible licenses, collaborations or other similar arrangements with respect to development and/or commercialization rights to vosaroxin or our other development programs, or a combination of the above. Any issuance of convertible debt securities, preferred stock or common stock may be at a discount from the then-current trading price of our common stock. If we issue additional common or preferred stock or securities convertible into common or preferred stock, our stockholders will experience additional dilution, which may be significant. Further, we do not know whether additional funding will be available on acceptable terms, or at all. If we are unable to raise substantial additional funding on acceptable terms, or at all, we will be forced to delay or reduce the scope of our vosaroxin development program, potentially including any additional clinical trials or regulatory filings in Europe and the United States related to vosaroxin, and/or limit or cease our operations.

We have incurred losses since inception and anticipate that we will continue to incur losses for the foreseeable future. We may not ever achieve or sustain profitability.*

We are not profitable and have incurred losses in each year since our inception in 1998. Our net losses for the six months ended June 30, 2015 and the years ended December 31, 2014 and 2013 were $18.1 million, $43.0 million and $34.6 million, respectively. As of June 30, 2015, we had an accumulated deficit of $540.8 million. We do not currently have any products that have been approved for marketing, and we continue to incur substantial development and general and administrative expenses related to our operations. We expect to continue to incur losses for the foreseeable future, and we expect these losses to increase significantly as we seek regulatory approvals for vosaroxin, and as we prepare to commercialize vosaroxin, if approved. Our losses, among other things, have caused and will continue to cause our stockholders’ equity and working capital to decrease.

To date, we have derived substantially all of our revenue from license and collaboration agreements. We currently have two agreements, the Biogen Idec 2nd ARCA and the Amended Millennium Agreement, which each include certain pre-commercialization event-based and royalty payments. We cannot predict whether we will receive any such payments under these agreements in the foreseeable future, or at all.

We also do not anticipate that we will generate revenue from the sale of products until at least 2016, if at all. In the absence of additional sources of capital, which may not be available to us on acceptable terms, or at all, the development of vosaroxin or future product candidates, if any, may be reduced in scope, delayed or terminated. If our product candidates or those of our collaborators fail in clinical trials or do not gain regulatory approval, or if our future products do not achieve market acceptance, we may never become profitable. Even if we achieve profitability in the future, we may not be able to sustain profitability in subsequent periods.

The development of vosaroxin could be halted or significantly delayed for various reasons; our clinical trials for vosaroxin may not lead to regulatory approval.*

Vosaroxin is vulnerable to the risks of failure inherent in the drug development process. Our VALOR trial failed to meet its primary endpoint, and we may not be able to obtain regulatory approval for commercialization in any of the United States, Europe, or in other regions. Based upon a meeting with the FDA held in July 2015, the FDA recommended that we provide additional clinical evidence prior to any regulatory filing in the United States. We may also need to conduct significant additional preclinical studies and clinical trials before we can attempt to demonstrate that vosaroxin is safe and effective to the satisfaction of the EMA and other regulatory authorities. Failure can occur at any stage of the development process, and successful preclinical studies and early clinical trials do not ensure that later clinical trials will be successful. A number of companies in the pharmaceutical industry have suffered significant setbacks in advanced clinical trials, even after obtaining promising results in earlier trials.

For example, we terminated two Phase 2 clinical trials of vosaroxin in small cell and non-small cell lung cancer, and the LI-1 trial, conducted by a co-operative group in Europe, was halted at an interim data analysis. If our clinical trials result in unacceptable toxicity or lack of efficacy, we may have to terminate them. If clinical trials are halted, or if they do not show that vosaroxin is safe and effective in the indications for which we are seeking regulatory approval, our future growth will be limited and we may not have any other product candidates to develop.

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We do not know whether any future clinical trials with vosaroxin or any of our product candidates will be completed on schedule, or at all, or whether our ongoing or planned clinical trials will begin or progress on the time schedule we anticipate. The commencement of future clinical trials could be substantially delayed or prevented by several factors, including:

· delays or failures to raise additional funding;

· results of future meetings with the EMA, FDA and/or other regulatory bodies;

· a limited number of, and competition for, suitable patients with particular types of cancer for enrollment in our clinical trials;

· delays or failures in obtaining regulatory approval to commence a clinical trial;

· delays or failures in obtaining sufficient clinical materials;

· delays or failures in obtaining approval from independent institutional review boards to conduct a clinical trial at prospective sites; or

· delays or failures in reaching acceptable clinical trial agreement terms or clinical trial protocols with prospective sites.

The completion of our clinical trials could be substantially delayed or prevented by several factors, including:

· delays or failures to raise additional funding;

· slower than expected rates of patient recruitment and enrollment;

· failure of patients to complete the clinical trial;

· delays or failures in reaching the number of events pre-specified in the trial design;

· the need to expand the clinical trial;

· delays or failures in obtaining sufficient clinical materials, including vosaroxin and any drugs to be tested in combination with vosaroxin;

· unforeseen safety issues;

· lack of efficacy during clinical trials;

· inability or unwillingness of patients or clinical investigators to follow our clinical trial protocols; and

· inability to monitor patients adequately during or after treatment.

Additionally, our clinical trials may be suspended or terminated at any time by the FDA, other regulatory authorities, or ourselves. Any failure to complete or significant delay in completing clinical trials for our product candidates could harm our financial results and the commercial prospects for our product candidates.

We rely on a limited number of third-party manufacturers that are capable of manufacturing the vosaroxin active pharmaceutical ingredient, or API, and finished drug product, or FDP, to supply us with our vosaroxin API and FDP. If we fail to obtain sufficient quantities of these materials, the development and potential commercialization of vosaroxin could be halted or significantly delayed.*

We do not currently own or operate manufacturing facilities and lack the capability to manufacture vosaroxin on a clinical or commercial scale. As a result, we rely on third parties to manufacture vosaroxin API and FDP. The vosaroxin API is classified as a cytotoxic substance, limiting the number of available manufacturers for both API and FDP.

We currently rely on a single contract manufacturer for the production of vosaroxin API and a single contract manufacturer to formulate the vosaroxin API and fill and finish vials of the vosaroxin FDP. If our third-party vosaroxin API or FDP manufacturers are unable or unwilling to produce the vosaroxin API or FDP we require, we would need to establish arrangements with one or more alternative suppliers. However, establishing a relationship with an alternative supplier would likely delay our ability to produce vosaroxin API or FDP. Our ability to replace an existing manufacturer would also be difficult and time consuming because the number of potential manufacturers is limited and the FDA or equivalent foreign regulatory body must approve any replacement manufacturer before it can be an approved commercial supplier. Such approval would require new testing, stability programs and compliance inspections. It may be difficult or impossible for us to identify and engage a replacement manufacturer on acceptable terms in a timely manner, or at all. We expect to continue to depend on third-party contract manufacturers for all our vosaroxin API and FDP needs for the foreseeable future.

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Vosaroxin requires precise, high quality manufacturing. For example, in the past, we observed visible particles during stability studies of two vosaroxin FDP lots which resulted from process impurities in the vosaroxin API that, when formulated into the packaged vial of the vosaroxin FDP, resulted in the formation of these particles. We have since addressed this issue by the implementation of a revised manufacturing process to control the impurities and thereby minimize particle formation, however, there is no assurance that similar issues will not arise in the future as we prepare for regulatory approval and potential commercialization of vosaroxin.

In addition to process impurities, the failure of our contract manufacturers to achieve and maintain high manufacturing standards in compliance with cGMP regulations could result in other manufacturing errors leading to patient injury or death, product recalls or withdrawals, delays or interruptions of production or failures in product testing or delivery. Although contract manufacturers are subject to ongoing periodic unannounced inspection by the FDA and corresponding state agencies to ensure strict compliance with cGMP and other applicable government regulations and corresponding foreign standards, any such performance failures on the part of a contract manufacturer could result in the delay or prevention of filing or approval of marketing applications for vosaroxin, cost overruns or other problems that could seriously harm our business. This would deprive us of potential product revenue and result in additional losses.

To date, vosaroxin has been manufactured in quantities appropriate for preclinical studies and clinical trials, including the manufacture of registration batches of API and FDP. Although we have completed process validation for vosaroxin API, prior to commercial sale, we will need to perform a process validation study for vosaroxin FDP. If the results of this process validation study does not meet preset criteria, the regulatory approval or commercial launch of vosaroxin may be delayed.

The failure to enroll patients for clinical trials may cause delays in developing vosaroxin.*

We may encounter delays if we are unable to enroll enough patients to complete clinical trials of vosaroxin. Based upon a meeting with the FDA held in July 2015, the FDA recommended that we provide additional clinical evidence prior to any regulatory filing in the United States, therefore we will need to enroll patients in the related clinical trial or trials and may also be required to enroll patients for additional clinical trials required by the EMA or other regulatory authorities. Patient enrollment depends on many factors, including the size of the patient population, the nature of the protocol, the proximity of patients to clinical sites, the number and nature of competing treatments and ongoing clinical trials of competing drugs for the same indication, and the eligibility criteria for the trial. Patients participating in our trials may elect to leave our trials and switch to alternative treatments that are available to them, either commercially or on an expanded access basis, or in other clinical trials. Competing treatments include nucleoside analogs, anthracyclines and hypomethylating agents. Moreover, when one product candidate is evaluated in multiple clinical trials simultaneously, patient enrollment in ongoing trials can be adversely affected by negative results from completed trials.

The results of preclinical studies and clinical trials may not satisfy the requirements of the EMA, FDA or other regulatory agencies.*

Prior to receiving approval to commercialize vosaroxin or future product candidates, if any, in Europe, the United States or in other territories, we must demonstrate with substantial evidence from well-controlled clinical trials, to the satisfaction of the EMA, FDA and other regulatory authorities, that such product candidates are safe and effective for their intended uses. The results from preclinical studies and clinical trials can be interpreted in different ways, and based upon a meeting with the FDA held in July 2015, the FDA recommended that we provide additional clinical evidence prior to any regulatory filing for vosaroxin in the United States. Even if we believe preclinical or clinical data from preclinical studies and clinical trials are promising, such data may not be sufficient to support approval by the EMA, FDA and other regulatory authorities.

We rely on third parties to conduct our clinical trials. If these third parties do not successfully carry out their contractual duties or fail to meet expected deadlines, we may be unable to obtain regulatory approval for, or commercialize, vosaroxin.

We rely on third parties, such as contract research organizations, medical institutions, clinical investigators and contract laboratories, to conduct our planned and existing clinical trials for vosaroxin. If the third parties conducting our clinical trials do not perform their contractual duties or obligations, do not meet expected deadlines or need to be replaced, or if the quality or accuracy of the clinical data they obtain is compromised due to the failure to adhere to our clinical trial protocols or for any other reason, we may need to enter into new arrangements with alternative third parties and our clinical trials may be extended, delayed or terminated or may need to be repeated, and we may not be able to obtain regulatory approval for or commercialize the product candidate being tested in such trials.

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We may expand our development capabilities in the future, and any difficulties hiring or retaining key personnel or managing this growth could disrupt our operations.

We are highly dependent on the principal members of our development staff. We may expand our research and development capabilities in the future by increasing expenditures in these areas, hiring additional employees and potentially expanding the scope of our current operations. Future growth will require us to continue to implement and improve our managerial, operational and financial systems and continue to retain, recruit and train additional qualified personnel, which may impose a strain on our administrative and operational infrastructure. The competition for qualified personnel in the biopharmaceutical field is intense. We are highly dependent on our continued ability to attract, retain and motivate highly qualified management and specialized personnel required for clinical development. Due to our limited resources, we may not be able to effectively manage any expansion of our operations or recruit and train additional qualified personnel. If we are unable to retain key personnel or manage our growth effectively, we may not be able to implement our business plan.

If we are sued for infringing intellectual property rights of third parties, litigation will be costly and time-consuming and could prevent us from developing or commercializing vosaroxin.*

Our commercial success depends on not infringing the patents and other proprietary rights of third parties and not breaching any collaboration or other agreements we have entered into with regard to our technologies and product candidates. If a third party asserts that we are using technology claimed in issued and unexpired patents owned or controlled by the third party, we may need to obtain a license, enter into litigation to challenge the validity of the patents or incur the risk of litigation in the event that a third party asserts that we infringe its patents.

If a third party asserts that we infringe its patents or other proprietary rights, we could face a number of challenges that could seriously harm our competitive position, including:

· infringement and other intellectual property claims, which would be costly and time consuming to litigate, whether or not the claims have merit, and which could delay the regulatory approval process and divert management’s attention from our business;

· substantial damages for past infringement, which we may have to pay if a court determines that vosaroxin or any future product candidates infringe a third party’s patent or other proprietary rights;

· a court order prohibiting us from selling or licensing vosaroxin or any future product candidates unless a third party licenses relevant patent or other proprietary rights to us, which it is not required to do; and

· if a license is available from a third party, we may have to pay substantial royalties or grant cross-licenses to our patents or other proprietary rights.

If our competitors develop and market products that are more effective, safer or less expensive than vosaroxin, our commercial opportunities will be negatively impacted.

The life sciences industry is highly competitive, and we face significant competition from many pharmaceutical, biopharmaceutical and biotechnology companies that are researching, developing and marketing products designed to address the treatment of cancer, including AML, MDS and B-cell malignancies. Many of our competitors have significantly greater financial, manufacturing, marketing and drug development resources than we do. Large pharmaceutical companies in particular have extensive experience in the clinical testing of, obtaining regulatory approvals for, and marketing drugs.

We believe that our ability to successfully compete in the marketplace with vosaroxin and any future product candidates, if any, will depend on, among other things:

· our ability to develop novel compounds with attractive pharmaceutical properties and to secure, protect and maintain intellectual property rights based on our innovations;

· the efficacy, safety and reliability of our product candidates;

· the speed at which we develop our product candidates;

· our ability to design and successfully execute appropriate clinical trials;

· our ability to maintain a good relationship with regulatory authorities;

· our ability to obtain, and the timing and scope of, regulatory approvals;

· our ability to manufacture and sell commercial quantities of future products to the market;

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· the availability of reimbursement from government agencies and private insurance companies; and

· acceptance of future products by physicians and other healthcare providers.

Vosaroxin is a small molecule therapeutic that, if approved, will compete with other drugs and therapies currently used for AML, such as nucleoside analogs, anthracyclines, hypomethylating agents, other inhibitors of topoisomerase II, and other novel agents. Additionally, other compounds currently in development could become potential competitors of vosaroxin, if approved for marketing.

If approved, we expect competition for vosaroxin for the treatment of AML and other potential future indications to increase as additional products are developed and approved in various patient populations. If our competitors market products that are more effective, safer or less expensive than vosaroxin or our other future products, if any, or that reach the market sooner we may not achieve commercial success or substantial market penetration. In addition, the biopharmaceutical industry is characterized by rapid change. Products developed by our competitors may render vosaroxin or any future product candidates obsolete.

Our proprietary rights may not adequately protect vosaroxin or future product candidates, if any.

Our commercial success will depend on our ability to obtain patents and maintain adequate protection for vosaroxin and any future product candidates in Europe, the United States and other countries. We own, co-own or have rights to a significant number of issued U.S. and foreign patents and pending U.S. and foreign patent applications. We will be able to protect our proprietary rights from unauthorized use by third parties only to the extent that our proprietary technologies and future products are covered by valid and enforceable patents or are effectively maintained as trade secrets or are subject to marketing exclusivity administered by regulatory authorities.

We apply for patents covering both our technologies and product candidates, as we deem appropriate. However, we may fail to apply for patents on important technologies or product candidates in a timely fashion, or at all. Our existing patents and any future patents we obtain may not be sufficiently broad, valid, or enforceable to prevent others from practicing our technologies or from developing competing products and technologies. In addition, we generally do not exclusively control the patent prosecution of subject matter that we license to or from others. Accordingly, in such cases we are unable to exercise the same degree of control over this intellectual property as we would over our own. Moreover, the patent positions of biopharmaceutical companies are highly uncertain and involve complex legal and factual questions for which important legal principles remain unresolved. As a result, the scope, validity and enforceability of patents can vary from country to country, and can change depending on changes in national and international law, and as such, cannot be predicted with certainty. In addition, we do not know whether:

· we, our licensors or our collaboration partners were the first to make the inventions covered by each of our issued patents and pending patent applications;

· we, our licensors or our collaboration partners were the first to file patent applications for these inventions;

· others will independently develop similar or alternative technologies or duplicate any of our technologies;

· any of our, our licensors’ or our collaboration partners’ pending patent applications will result in issued patents;

· any of our, our licensors’ or our collaboration partners’ patents will be valid or enforceable;

· because of differences in patent laws of countries, any patent granted in one country or region will be granted in another, or, if so, have the same or a different scope;

· any patents issued to us, our licensors or our collaboration partners will provide us with any competitive advantages, or will be challenged by third parties;

· we will develop additional proprietary technologies that are patentable; or

· any patents or other proprietary rights of third parties will have an adverse effect on our business.

We also rely on trade secrets to protect some of our technology, especially where we do not believe patent protection is appropriate or obtainable. However, trade secrets are difficult to maintain. While we use reasonable efforts to protect our trade secrets, our or our collaboration partners’ employees, consultants, contractors or scientific and other advisors, or those of our licensors or collaborators, may unintentionally or willfully disclose our proprietary information to competitors. Enforcement of claims that a third party has illegally obtained and is using trade secrets is expensive, time consuming and uncertain. In addition, foreign courts are sometimes less willing than U.S. courts to protect trade secrets. If our competitors independently develop equivalent knowledge, methods and know-how, we would not be able to assert our trade secret protection against them and our business could be harmed.

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The initial composition-of-matter patents covering vosaroxin have expired orare due to expire in 2015. While we continue to seek additional patent protection for vosaroxin and methods of its manufacture and use, even if vosaroxin is approved by the EMA, FDA or foreign equivalents thereof, we may not be able to recover our development costs prior to the expiration of any patents that are granted.*

The vosaroxin composition-of-matter is covered by U.S. Patent No. 5,817,669 and its counterpart patents in 43 foreign jurisdictions. The U.S. patent is due to expire in October 2015, and most of its foreign counterparts expired in June 2015. Certain other foreign counterparts are due to expire in the fourth quarter of 2015. While it is possible that patent term restoration and/or supplemental patent certificates would be available for some U.S. or foreign patents we own or control through licenses, we cannot guarantee that such additional protection will be obtained, and the expiration dates described here do not include such term restoration.

We have been granted additional patents relating to vosaroxin compositions, and uses and manufacture of vosaroxin, in the U.S.:

· U.S. Patent No. 7,989,468 claims methods of use of vosaroxin at clinically relevant dose ranges and schedules for the treatment of leukemia, with expiry in 2026;

· U.S. Patent Nos. 7,829,577 and 8,669,270 claim certain pharmaceutical compositions of vosaroxin, including the formulation used in our VALOR trial, with expiry in 2025;

· U.S. Patent No. 8,580,814 claims certain methods of use of vosaroxin at clinically relevant dose ranges to treat acute myelogenous leukemia, with expiry in 2026;

· U.S. Patent No. 8,822,493 claims certain methods of use of vosaroxin at clinically relevant dose ranges together with therapeutically effective amounts of cytarabine to treat cancer, with expiry in 2024;

· U.S. 8,124,773 B2 claims a hydrate of vosaroxin with expiry in 2028 and U.S. Patent No. 8,765,954 claims certain compositions containing this hydrate of vosaroxin, with expiry in 2027;

· U.S. Patent No. 8,497,282 claims a method of making vosaroxin, with expiry in 2031 and U.S. Patent No. 8,802,719 claims certain intermediates useful in the making of vosaroxin, with expiry in 2029;

· U.S. Patent Nos. 8,586,601 and 8,138,202 claim certain compositions containing vosaroxin, with expiry in 2030; and

· U.S. Patent No. 7,968,565 claims a combination of vosaroxin and cytarabine, with expiry in 2026.

We have been granted additional patents relating to vosaroxin compositions, and uses and manufacture of vosaroxin, in Europe:

· EPO Patent No. 1725233 B1, which has been validated in multiple EPO member states, claims certain pharmaceutical compositions of vosaroxin, including the formulation used in our VALOR trial, with expiry in 2025; and

· EP Patent No. 1729770 B1, which has been validated in multiple EPO member states, claims combinations of vosaroxin and certain anticancer agents, including cytarabine, with expiry in 2025.

In addition to the listed United States and European patents, we have been granted similar and related patents in certain other countries, and patent applications are pending in these and other countries, including major markets, throughout the world.  In addition, other patents have been granted in the United States and other countries claiming certain technology related to vosaroxin and other methods of use of vosaroxin.

We do not know when, if ever, vosaroxin will be approved by the EMA, FDA or foreign regulatory authorities. Even if vosaroxin is approved for commercial marketing in the future, we may not have sufficient time to commercialize our vosaroxin product to enable us to recover our development costs prior to the expiration of the U.S. and foreign patents covering vosaroxin. We do not know whether patent term extensions and data exclusivity periods will be available in the future for any or all of the patents we own or have licensed. Our obligation to pay royalties to Sumitomo Dainippon Pharma Co., Ltd., the company from which we licensed vosaroxin, may extend beyond the patent expiration, which would further erode the profitability of this product. In addition, our potential obligation to pay RPI royalties pursuant to the Royalty Agreement would also further erode the profitability of this product.

Any future workforce and expense reductions may have an adverse impact on our internal programs, our ability to hire and retain key personnel and may be distracting to management.

We have, in the past, implemented a number of workforce reductions. Depending on our need for additional funding and expense control, we may be required to implement further workforce and expense reductions in the future. Further workforce and expense reductions could result in reduced progress on our internal programs. In addition, employees, whether or not directly affected by a reduction, may seek future employment with our business partners or competitors. Although our employees are required to sign a confidentiality agreement at the time of hire, the confidential nature of certain proprietary information may not be maintained in the

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course of any such future employment. Further, we believe that our future success will depend in large part upon our ability to attract and retain highly skilled personnel. We may have difficulty retaining and attracting such personnel as a result of a perceived risk of future workforce and expense reductions. In addition, the implementation of expense reduction programs may result in the diversion of efforts of our executive management team and other key employees, which could adversely affect our business.

We may be subject to damages resulting from claims that we or our employees have wrongfully used or disclosed alleged trade secrets of our employees’ former employers.

Many of our employees were previously employed at biotechnology or pharmaceutical companies, including our competitors or potential competitors. We may be subject to claims that we or our employees have inadvertently or otherwise used or disclosed trade secrets or other proprietary information of their former employers. Litigation may be necessary to defend against these claims. If we fail in defending such claims, in addition to paying monetary damages, we may lose valuable intellectual property rights or personnel.

A loss of key personnel or the work product of current or former personnel could hamper or prevent our ability to commercialize vosaroxin, which could severely harm our business. Even if we are successful in defending against these claims, litigation could result in substantial costs and be a distraction to management.

We currently have limited marketing staff and no sales or distribution organization. If we are unable to develop a sales and marketing and distribution capability on our own, by contracting with third parties or through collaborations with marketing partners, we will not be successful in commercializing vosaroxin.*

We currently have no sales or distribution capabilities and a limited marketing staff. If we are able to pursue and obtain marketing approval for vosaroxin in Europe or the U.S., we may establish our own sales and marketing organization with technical expertise and supporting distribution capabilities to commercialize vosaroxin in these territories, which will be expensive and time consuming. Any failure or delay in the development of our internal or subcontracted sales, marketing and distribution capabilities would adversely impact the commercialization of these products. We plan to collaborate with third parties that have direct sales forces and established distribution systems in certain territories as part of the commercialization of vosaroxin. To the extent that we enter into co-promotion or other licensing arrangements, our product revenue is likely to be lower than if we marketed or sold vosaroxin directly. In addition, any revenue we receive will depend upon the efforts of third parties, which may not be successful and are only partially within our control. If we are unable to enter into such arrangements on acceptable terms or at all, we may not be able to successfully commercialize vosaroxin. If we are not successful in commercializing vosaroxin or our future product candidates, if any, either on our own or through collaborations with one or more third parties, our future product revenue will suffer and we may incur significant additional losses.

We depend on various consultants and advisors for the success and continuation of our development efforts.

We work extensively with various consultants and advisors, who provide advice and/or services in various business and development functions, including clinical development, operations and strategy, regulatory matters, biostatistics, legal and finance. The potential success of our drug development programs depends, in part, on continued collaborations with certain of these consultants and advisors. Our consultants and advisors are not our employees and may have commitments and obligations to other entities that may limit their availability to us. We do not know if we will be able to maintain such relationships or that such consultants and advisors will not enter into other arrangements with competitors, any of which could have a detrimental impact on our development objectives and our business.

If conflicts of interest arise between our current or future licensees or collaboration partners, if any, and us, any of them may act in their self-interest, which may be adverse to our interests.

If a conflict of interest arises between us and one or more of our current or potential future licensees or collaboration partners, if any, they may act in their own self-interest or otherwise in a way that is not in the interest of our company or our stockholders. Biogen Idec, Millennium, or potential future licensees or collaboration partners, if any, are conducting or may conduct product development efforts within the disease area that is the subject of a license or collaboration with our company. In current or potential future licenses or collaborations, if any, we have agreed or may agree not to conduct, independently or with any third party, any research that is competitive with the research conducted under our licenses or collaborations. Our licensees or collaboration partners, however, may develop, either alone or with others, products in related fields that are competitive with the product candidates that are the subject of these licenses or collaborations. Competing products, either developed by our licensees or collaboration partners or to which our licensees or collaboration partners have rights, may result in their withdrawal of support for a product candidate covered by the license or collaboration agreement.

If one or more of our current or potential future licensees or collaboration partners, if any, were to breach or terminate their license or collaboration agreements with us or otherwise fail to perform their obligations thereunder in a timely manner, the preclinical

28

or clinical development or commercialization of the affected product candidates could be delayed or terminated. We do not know whether our licensees or collaboration partners will pursue alternative technologies or develop alternative product candidates, either on their own or in collaboration with others, including our competitors, as a means for developing treatments for the diseases targeted by licenses or collaboration agreements with our company.

Compliance with changing regulation of corporate governance and public disclosure may result in additional expenses.

Changing laws, regulations and standards relating to corporate governance and public disclosure may create uncertainty regarding compliance matters. New or changed laws, regulations and standards are subject to varying interpretations in many cases. As a result, their application in practice may evolve over time. We are committed to maintaining high standards of corporate governance and public disclosure. Complying with evolving interpretations of new or changed legal requirements may cause us to incur higher costs as we revise current practices, policies and procedures, and may divert management time and attention from potential revenue-generating activities to compliance matters. If our efforts to comply with new or changed laws, regulations and standards differ from the activities intended by regulatory or governing bodies due to ambiguities related to practice, our reputation may also be harmed. Further, our board members, chief executive officer and chief financial officer could face an increased risk of personal liability in connection with the performance of their duties. As a result, we may have difficulty attracting and retaining qualified board members and executive officers, which could harm our business.

Raising funds through lending arrangements or revenue participation agreements may restrict our operations or produce other adverse results.

Our loan and security agreement, as amended, or the Loan Agreement, with Oxford Finance LLC, Silicon Valley Bank and Horizon Technology Finance Corporation, or collectively, the Lenders, contains a variety of affirmative and negative covenants, including required financial reporting, limitations on certain dispositions of assets, limitations on the incurrence of additional debt and other requirements. To secure our performance of our obligations under this Loan Agreement, on October 18, 2011, we granted a perfected first priority security interest in substantially all of our assets, other than intellectual property assets, to the Lenders. Additionally, following the purchase of the revenue participation right by RPI on September 18, 2012, we granted both the Lenders and RPI a security interest in certain of our assets, including our intellectual property related to vosaroxin, which may only be perfected following first product approval in any country or territory. The Lenders will retain a senior position to RPI’s security interest for so long as any indebtedness under the Loan Agreement remains outstanding. Our failure to comply with the covenants in the Loan Agreement, the occurrence of a material impairment in our prospect of repayment or in the perfection or priority of the Lender’s lien on our assets, as determined by the Lenders, or the occurrence of certain other specified events could result in an event of default that, if not cured or waived, could result in the acceleration of all or a substantial portion of our debt, potential foreclosure on our assets and other adverse results.

In addition, following the purchase of the revenue participation right by RPI, we are required to pay RPI a specified percentage of any net sales of vosaroxin. If we fail to make timely payments due to RPI under the Royalty Agreement, RPI may require us to repurchase the revenue participation right. As collateral for these payments, we granted RPI a security interest in certain of our assets, including our intellectual property related to vosaroxin, as detailed above.

We are exposed to risks related to foreign currency exchange rates and European sovereign debt.

Some of our costs and expenses are denominated in foreign currencies. Most of our foreign expenses are associated with activities related to the VALOR trial which occurred outside of the United States, and in particular in Western Europe. When the U.S. dollar weakens against the Euro or British pound, the U.S. dollar value of the foreign currency denominated expense increases, and when the U.S. dollar strengthens against the Euro or British pound, the U.S. dollar value of the foreign currency denominated expense decreases. Consequently, changes in exchange rates, and in particular a weakening of the U.S. dollar, may adversely affect our results of operations. We have and may continue to purchase certain European currencies or highly-rated investments denominated in such currencies to manage the risk of future movements in foreign exchange rates that would affect such payables, in accordance with our investment policy. However, there is no guarantee that the related gains and losses will substantially offset each other, and we may be subject to significant exchange gains or losses as currencies fluctuate from quarter to quarter.

In addition, the recent sovereign debt crisis concerning certain European countries and related European financial restructuring efforts has and may continue to cause the value of the Euro to deteriorate. Such deterioration could adversely impact any cash or investments we hold that are denominated in Euros. Rating agency downgrades on European sovereign debt and any potential default of European government issuers further contribute to this uncertainty. Should governments default on their obligations, we may experience loss of principal on any investments in European sovereign debt.

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Our facilities are located near known earthquake fault zones, and the occurrence of an earthquake or other catastrophic disaster, or interruption by man-made problems such as network security breaches, viruses or terrorism, could cause damage to our facilities and equipment, which could require us to cease or curtail operations.

Our facilities are located in the San Francisco Bay Area near known earthquake fault zones and are vulnerable to significant damage from earthquakes. We are also vulnerable to damage from other types of disasters, including fires, floods, power loss, communications failures and similar events. Despite the implementation of network security measures, our networks also may be vulnerable to computer viruses, break-ins and similar disruptions.  We rely on information technology systems to operate our business and to communicate among our workforce and with third parties. If any disruption were to occur, whether caused by a natural disaster or by manmade problems, our ability to operate our business at our facilities may be seriously or completely impaired and our data could be lost or destroyed.

Risks Related to Our Industry

The regulatory approval process is expensive, time consuming and uncertain and may prevent us from obtaining approval for the commercialization of vosaroxin.*

The research, testing, manufacturing, selling and marketing of product candidates are subject to extensive regulation by the FDA and other regulatory authorities in the United States and other countries, which regulations differ from country to country. Neither we nor our present or potential future collaboration or licensing partners, if any, are permitted to market our product candidates in Europe or the United States until we receive approval of an MAA or NDA for these respective territories, or in any other country without the equivalent marketing approval from such country. We have not received marketing approval for vosaroxin in any jurisdiction. In addition, failure to comply with EMA, FDA and other applicable U.S. and foreign regulatory requirements may subject us to administrative or judicially imposed sanctions, including warning letters, civil and criminal penalties, injunctions, product seizure or detention, product recalls, total or partial suspension of production, and refusal to approve pending MAAs, NDAs, supplements to approved MAAs, NDAs or their equivalents in other territories.

Regulatory approval of an MAA or NDA or their equivalent in other territories is not guaranteed, and the approval process is expensive, uncertain and may take several years. Furthermore, the development process for oncology products may take longer than in other therapeutic areas. Regulatory authorities have substantial discretion in the drug approval process. Despite the time and expense exerted, failure can occur at any stage, and we could encounter problems that cause us to abandon clinical trials or to repeat or perform additional preclinical studies and clinical trials. The number of preclinical studies and clinical trials that will be required for marketing approval varies depending on the drug candidate, the disease or condition that the drug candidate is designed to address, and the regulations applicable to any particular drug candidate. In particular, the VALOR trial failed to meet its primary endpoint, and in July 2015, the FDA recommended that we provide additional clinical evidence before any regulatory filing for vosaroxin for the treatment of AML in the United States.

The EMA, FDA or other foreign regulatory authority can delay, limit or deny approval of a drug candidate for many reasons, including:

· the drug candidate may not be deemed safe or effective;

· regulatory officials may not find the data from preclinical studies and clinical trials sufficient;

· the EMA, FDA or other foreign regulatory authority might not approve our or our third-party manufacturers’ processes or facilities; or

· the EMA, FDA or other foreign regulatory authority may change its approval policies or adopt new regulations.

We may be subject to costly claims related to our clinical trials and may not be able to obtain adequate insurance.

Because we conduct clinical trials in humans, we face the risk that the use of vosaroxin or future product candidates, if any, will result in adverse side effects. We cannot predict the possible harms or side effects that may result from our clinical trials. Although we have clinical trial liability insurance, our insurance may be insufficient to cover any such events. We do not know whether we will be able to continue to obtaRein clinical trial coverage on acceptable terms, or at all. We may not have sufficient resources to pay for any liabilities resulting from a claim excluded from, or beyond the limit of, our insurance coverage. There is also a risk that third parties that we have agreed to indemnify could incur liability. Any litigation arising from our clinical trials, even if we were ultimately successful, would consume substantial amounts of our financial and managerial resources and may create adverse publicity.

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Even if we receive regulatory approval to sell vosaroxin, the market may not be receptive to vosaroxin.

Even if vosaroxin obtains regulatory approval, it may not gain market acceptance among physicians, patients, healthcare payors and/or the medical community. We believe that the degree of market acceptance will depend on a number of factors, including:

· timing of market introduction of competitive products;

· efficacy of our product;

· prevalence and severity of any side effects;

· potential advantages or disadvantages over alternative treatments;

· strength of marketing and distribution support;

· price of vosaroxin, both in absolute terms and relative to alternative treatments; and

· availability of reimbursement from health maintenance organizations and other third-party payors.

For example, the potential toxicity of single and repeated doses of vosaroxin has been explored in a number of animal studies that suggest the dose-limiting toxicities in humans receiving vosaroxin may be similar to some of those observed with approved cytotoxic agents, including reversible toxicity to bone marrow cells, the gastrointestinal system and other systems with rapidly dividing cells. In our Phase 1, Phase 2 and VALOR clinical trials of vosaroxin, we have witnessed the following side effects, irrespective of causality, ranging from mild to more severe: lowered white blood cell count that may lead to a serious or possibly fatal infection, hair loss, mouth sores, fatigue, nausea with or without vomiting, lowered platelet count, which may lead to an increase in bruising or bleeding, lowered red blood cell count (anemia), weakness, tiredness, shortness of breath, diarrhea and intestinal blockage.

If vosaroxin fails to achieve market acceptance, due to unacceptable side effects or any other reasons, we may not be able to generate significant revenue or to achieve or sustain profitability.

Even if we receive regulatory approval for vosaroxin, we will be subject to ongoing EMA, FDA and other regulatory obligations and continued regulatory review, which may result in significant additional expense and limit our ability to commercialize vosaroxin.*

Any regulatory approvals that we or our potential future collaboration partners receive for vosaroxin or our future product candidates, if any, may also be subject to limitations on the indicated uses for which the product may be marketed or contain requirements for potentially costly post-marketing trials. In addition, even if approved, the labeling, packaging, adverse event reporting, storage, advertising, promotion and recordkeeping for any product will be subject to extensive and ongoing regulatory requirements. The subsequent discovery of previously unknown problems with a product, including adverse events of unanticipated severity or frequency, may result in restrictions on the marketing of the product, and could include withdrawal of the product from the market.

Regulatory policies may change and additional government regulations may be enacted that could prevent or delay regulatory approval of our product candidates. We cannot predict the likelihood, nature or extent of government regulation that may arise from future legislation or administrative action, either in Europe, the United States or other territories. If we are not able to maintain regulatory compliance, we might not be permitted to market vosaroxin or our future products and we may not achieve or sustain profitability.

The coverage and reimbursement status of newly approved drugs is uncertain, and failure to obtain adequate coverage and reimbursement could limit our ability to market vosaroxin and decrease our ability to generate revenue.

There is significant uncertainty related to the third party coverage and reimbursement of newly approved drugs both nationally and internationally. The commercial success of vosaroxin and our future products, if any, in both domestic and international markets depends on whether third-party coverage and reimbursement is available for the ordering of our future products by the medical profession for use by their patients. Medicare, Medicaid, health maintenance organizations and other third-party payors are increasingly attempting to manage healthcare costs by limiting both coverage and the level of reimbursement of new drugs and, as a result, they may not cover or provide adequate payment for our future products. These payors may not view our future products as cost-effective, and reimbursement may not be available to consumers or may not be sufficient to allow our future products to be marketed on a competitive basis. Likewise, legislative or regulatory efforts to control or reduce healthcare costs or reform government healthcare programs could result in lower prices or rejection of our future products. Changes in coverage and reimbursement policies or healthcare cost containment initiatives that limit or restrict reimbursement for our future products may reduce any future product revenue.

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Failure to obtain regulatory approval in foreign jurisdictions will prevent us from marketing vosaroxin abroad.

We intend to market vosaroxin in international markets either directly or through a potential future collaboration partner, if any. In order to market vosaroxin in the European Union, Canada and many other foreign jurisdictions, we or a potential future collaboration partner must obtain separate regulatory approvals. We have, and potential future collaboration partners may have, had limited interactions with foreign regulatory authorities, and the approval procedures vary among countries and can involve additional testing at significant cost. The time required to obtain approval may differ from that required to obtain FDA approval. Approval by one foreign regulatory authority does not ensure approval by regulatory authorities in other foreign countries or by the FDA. The foreign regulatory approval processes may include all of the risks associated with obtaining FDA approval. We or a potential future collaboration partner may not obtain foreign regulatory approvals on a timely basis, if at all. We or a potential future collaboration partner may not be able to file for regulatory approvals and may not receive necessary approvals to commercialize vosaroxin or any other future products in any market.

Foreign governments often impose strict price controls, which may adversely affect our future profitability.

We intend to seek approval to market vosaroxin in Europe, the United States and other foreign jurisdictions either directly or through one or more potential future collaboration partners. If we or a potential future collaboration partner obtain approval in one or more foreign jurisdictions, we or the potential future collaboration partner will be subject to rules and regulations in those jurisdictions relating to vosaroxin. In some foreign countries, particularly in the European Union, prescription drug pricing is subject to governmental control. In these countries, pricing negotiations with governmental authorities can take considerable time after the receipt of marketing approval for a drug candidate. To obtain reimbursement or pricing approval in some countries, we or a potential future collaboration partner may be required to conduct a clinical trial that compares the cost-effectiveness of vosaroxin to other available therapies. If reimbursement of vosaroxin is unavailable or limited in scope or amount, or if pricing is set at unsatisfactory levels, we may be unable to achieve or sustain profitability.

We may incur significant costs complying with environmental laws and regulations, and failure to comply with these laws and regulations could expose us to significant liabilities.

We, through third-party contractors, use hazardous chemicals and radioactive and biological materials in our business and are subject to a variety of federal, state, regional and local laws and regulations governing the use, generation, manufacture, storage, handling and disposal of these materials. Although we believe our safety procedures for handling and disposing of these materials and waste products comply with these laws and regulations, we cannot eliminate the risk of accidental injury or contamination from the use, storage, handling or disposal of hazardous materials. In the event of contamination or injury, we could be held liable for any resulting damages, and any liability could significantly exceed our insurance coverage, which is limited for pollution cleanup and contamination.

Risks Related to Our Common Stock

The price of our common stock may continue to be volatile, and the value of an investment in our common stock may decline.*

In the six months ended June 30, 2015, our common stock traded as low as $1.90 and as high as $3.14, and in 2014, traded as low as $1.00 and as high as $8.46. Factors that could cause continued volatility in the market price of our common stock include, but are not limited to:

· our ability to raise additional capital to carry through with our clinical development plans and current and future operations and the terms of any related financing arrangement;

· results from, and any delays in or discontinuance of, ongoing and planned clinical trials for vosaroxin, including investigator-sponsored trials;

· announcements of additional FDA requirements for a regulatory path for vosaroxin or non-approval of vosaroxin, including the July 2015 request that we provide additional clinical evidence prior to any regulatory filing in the United States;

· delays in filing regulatory documents with the EMA, FDA or other regulatory agencies, or delays in the review process by the EMA, FDA or other foreign regulatory agencies;

· announcements relating to restructuring and other operational changes;

· delays in the commercialization of vosaroxin or our future products, if any;

· market conditions in the pharmaceutical, biopharmaceutical and biotechnology sectors;

· issuance of new or changed securities analysts’ reports or recommendations;

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· developments or disputes concerning our intellectual property or other proprietary rights;

· clinical and regulatory developments with respect to potential competitive products;

· failure to maintain compliance with the covenants in the Loan Agreement;

· introduction of new products by our competitors;

· issues in manufacturing vosaroxin drug substance or drug product, or future products, if any;

· market acceptance of vosaroxin or our future products, if any;

· announcements relating to our arrangements with Biogen Idec, Millennium or RPI;

· actual and anticipated fluctuations in our quarterly operating results;

· deviations in our operating results from the estimates of analysts;

· third-party healthcare reimbursement policies;

· EMA, FDA or other European, U.S. or foreign regulatory actions affecting us or our industry;

· litigation or public concern about the safety of vosaroxin or future products, if any;

· failure to develop or sustain an active and liquid trading market for our common stock;

· sales of our common stock by our officers, directors or significant stockholders; and

· additions or departures of key personnel.

Provisions of our charter documents or Delaware law could delay or prevent an acquisition of our company, even if the acquisition would be beneficial to our stockholders, and could make it more difficult to change management.

Provisions of our amended and restated certificate of incorporation and amended and restated bylaws may discourage, delay or prevent a merger, acquisition or other change in control that stockholders might otherwise consider favorable, including transactions in which stockholders might otherwise receive a premium for their shares. In addition, these provisions may frustrate or prevent any attempt by our stockholders to replace or remove our current management by making it more difficult to replace or remove our board of directors. These provisions include:

· a classified board of directors so that not all directors are elected at one time;

· a prohibition on stockholder action through written consent;

· limitations on our stockholders’ ability to call special meetings of stockholders;

· an advance notice requirement for stockholder proposals and nominations; and

· the authority of our board of directors to issue preferred stock with such terms as our board of directors may determine.

In addition, Delaware law prohibits a publicly held Delaware corporation from engaging in a business combination with an interested stockholder, generally a person who, together with its affiliates, owns or within the last three years has owned 15% of our voting stock, for a period of three years after the date of the transaction in which the person became an interested stockholder, unless the business combination is approved in a prescribed manner. Accordingly, Delaware law may discourage, delay or prevent a change in control of our company.

Provisions in our charter documents and provisions of Delaware law could limit the price that investors are willing to pay in the future for shares of our common stock.

We have never paid dividends on our capital stock and we do not anticipate paying any cash dividends in the foreseeable future.

We have never declared or paid cash dividends on our capital stock. We do not anticipate paying any cash dividends on our capital stock in the foreseeable future. In addition, under the terms of our Loan Agreement with the Lenders, we are precluded from paying cash dividends without the prior written consent of the Lenders. We currently intend to retain all available funds and any future earnings to fund the development and growth of our business. As a result, capital appreciation, if any, of our common stock will be our stockholders’ sole source of gain for the foreseeable future.

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We are at risk of securities class action litigation.

In the past, securities class action litigation has often been brought against a company following a decline in the market price of its securities. This risk is especially relevant for us because biotechnology companies have experienced greater than average stock price volatility in recent years. These broad market fluctuations may adversely affect the trading price or liquidity of our common stock. In the past, when the market price of a stock has been volatile, holders of that stock have sometimes instituted securities class action litigation against the issuer. If any of our stockholders were to bring such a lawsuit against us, we could incur substantial costs defending the lawsuit and the attention of our management would be diverted from the operation of our business.

The ownership of our capital stock is concentrated, and your interests may conflict with the interests of our existing stockholders.

Our executive officers and directors together with their affiliates beneficially owned approximately 17% of our outstanding capital stock as of June 30, 2015, assuming the exercise in full of the outstanding warrants to purchase common stock held by these stockholders as of such date. Accordingly, these stockholders, acting as a group, could have an influence over the outcome of corporate actions requiring stockholder approval, including the election of directors, any merger, consolidation or sale of all or substantially all of our assets or any other significant corporate transaction. The significant concentration of stock ownership may adversely affect the trading price of our common stock due to investors’ perception that conflicts of interest may exist or arise.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

None.

Item3. Defaults Upon Senior Securities

None.

Item4. Mine Safety Disclosures

Not applicable.

Item5. Other Information

None.

Item6. Exhibits

A list of exhibits filed with this report or incorporated herein by reference is found in the Exhibit Index immediately following the signature page of this report.

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SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	SUNESIS PHARMACEUTICALS, INC.
	(Registrant)
Date: July 30, 2015	/s/ ERIC H. BJERKHOLT
	Eric H. Bjerkholt
	Executive Vice President, Corporate Development and Finance, Chief Financial Officer and Corporate Secretary

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EXHIBIT INDEX

	Exhibit Description	Incorporated By Reference
Exhibit Number		Form	File No.	Exhibit	Filing Date	Filed Here with
31.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(a) or Rule 15d-14(a) of the Exchange Act					X
31.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(a) or Rule 15d-14(a) of the Exchange Act					X
32.1#	Certification of Chief Executive Officer and Chief Financial Officer pursuant to 13a-14(b) or 15d-14(b) of the Exchange Act					X
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Labels Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

# In accordance with Item 601(b)(32)(ii) of Regulation S-K and SEC Release Nos. 33-8238 and 34-47986, Final Rule; Management’s Reports on Internal Control over Financial Reporting and Certification of Disclosure in Exchange Act Periodic Reports, the Certification furnished in Exhibit 32.1 hereto is deemed to accompany this Form 10-Q and will not be filed for purposes of Section 18 of the Exchange Act. Such certification will not be deemed incorporated by reference into any filing under the Securities Act or the Exchange Act, except to the extent that the registrant specifically incorporates it by reference.

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EX-31.1

Exhibit 31.1

Certification of Chief Executive Officer

I, Daniel N. Swisher, Jr., certify that:

1. I have reviewed this quarterly report on Form 10-Q of Sunesis Pharmaceuticals, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: July 30, 2015	/s/ DANIEL N. SWISHER, JR.
	Daniel N. Swisher, Jr.
	President and Chief Executive Officer

EX-31.2

Exhibit 31.2

Certification of Chief Financial Officer

I, Eric H. Bjerkholt, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Sunesis Pharmaceuticals, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: July 30, 2015	/s/ ERIC H. BJERKHOLT
	Eric H. Bjerkholt
	Executive Vice President, Corporate Development and Finance, Chief Financial Officer and Corporate Secretary

EX-32.1

Exhibit 32.1

Certification

Pursuant to the requirement set forth in Rule 13a-14(b) of the Securities Exchange Act of 1934, as amended, (the “Exchange Act”) and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. §1350), Daniel N. Swisher, Jr., President and Chief Executive Officer and Eric H. Bjerkholt, Executive Vice President, Corporate Development and Finance and Chief Financial Officer, of Sunesis Pharmaceuticals, Inc. (the “Company”), each hereby certifies that, to the best of his knowledge:

1. The Company’s Quarterly Report on Form 10-Q for the period ended June 30, 2015, to which this Certification is attached as Exhibit 32.1 (the “Periodic Report”), fully complies with the requirements of Section 13(a) or Section 15(d) of the Exchange Act; and

2. The information contained in the Periodic Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: July 30, 2015	/s/ DANIEL N. SWISHER, JR.
	Daniel N. Swisher, Jr. President and Chief Executive Officer
Date: July 30, 2015	/s/ ERIC H. BJERKHOLT
	Eric H. Bjerkholt
	Executive Vice President, Corporate Development and Finance, Chief Financial Officer and Corporate Secretary

This certification accompanies the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of Sunesis Pharmaceuticals, Inc. under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.

XML

Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			6 Months Ended
	Jul. 31, 2015	Mar. 31, 2015	Apr. 30, 2013	Jun. 30, 2015	Jun. 30, 2014	Jul. 30, 2015	Aug. 31, 2011
Stockholders Equity [Line Items]
Proceeds from issuance of common stock through controlled equity offering facilities, net				$ 17,675	$ 4,726
Controlled Equity Offering Facilities [Member]
Stockholders Equity [Line Items]
Issuance of common stock, offering value							$ 20,000
Common stock sales agreement, date				2011-08
Issuance of common stock, remaining offering value				$ 18,700
Controlled Equity Offering Facilities [Member] | Subsequent Event
Stockholders Equity [Line Items]
Issuance of common stock, remaining offering value						$ 18,200
Controlled Equity Offering Facilities [Member] | Common Stock [Member]
Stockholders Equity [Line Items]
Common stock, shares sold				6,834,978
Price per common share				$ 2.65
Proceeds from issuance of common shares and warrants in offering, gross				$ 18,100
Proceeds from issuance of common stock through controlled equity offering facilities, net				$ 17,700
Controlled Equity Offering Facilities [Member] | Common Stock [Member] | Subsequent Event
Stockholders Equity [Line Items]
Common stock, shares sold	124,100
Price per common share	$ 3.70
Proceeds from issuance of common shares and warrants in offering, gross	$ 500
Proceeds from issuance of common stock through controlled equity offering facilities, net	$ 400
Additional Controlled Equity Offerings Facilities [Member] | April 2013
Stockholders Equity [Line Items]
Increase in aggregate controlled equity offering agreement as per amendment			$ 30,000
Issuance of common stock, commission percentage			3.00%
Common stock sales agreement amended, date				2013-04
Additional Controlled Equity Offerings Facilities [Member] | March 2015
Stockholders Equity [Line Items]
Increase in aggregate controlled equity offering agreement as per amendment		$ 30,000
Common stock sales agreement further amended, date				2015-03
Issuance of common stock, commission percentage, maximum		3.00%

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Financial Instruments - Summary of Available-for-Sale Securities in Unrealized Loss Position (Detail) $ in Thousands	Jun. 30, 2015 USD ($)
Schedule Of Available For Sale Securities [Line Items]
Gross Unrealized Losses	$ 5
Estimated Fair Value	9,772
U.S. corporate debt obligations [Member]
Schedule Of Available For Sale Securities [Line Items]
Gross Unrealized Losses	4
Estimated Fair Value	7,274
U.S. commercial paper [Member]
Schedule Of Available For Sale Securities [Line Items]
Gross Unrealized Losses	1
Estimated Fair Value	$ 2,498

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Royalty Agreement

6 Months Ended

Jun. 30, 2015

Revenue Recognition [Abstract]

Royalty Agreement

5. Royalty Agreement

In March 2012, the Company entered into a Revenue Participation Agreement (the “Royalty Agreement”), with RPI Finance Trust (“RPI”), an entity related to Royalty Pharma. In September 2012, pursuant to the provisions of the Royalty Agreement, RPI made a $25.0 million cash payment to the Company. The payment, less $3.1 million representing the fair value of the warrants granted under the arrangement, was initially classified as deferred revenue and is being amortized to revenue over the related performance period.

Revenue participation right payments will be made to RPI when and if vosaroxin is commercialized, at a rate of 6.75% of net sales of vosaroxin, on a product-by-product and country-by-country basis world-wide through the later of: (a) the expiration of the last to expire of certain specifically identified patents; (b) 10 years from the date of first commercial sale of such product in such country; or (c) the expiration of all applicable periods of data, market or other regulatory exclusivity in such country with respect to such product.

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Royalty Agreement - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Sep. 30, 2012	Jun. 30, 2015
Royalty Agreement [Line Items]
Revenue participation right payments, rate		6.75%
Revenue participation right payments, term		10 years from the date of first commercial sale
Maximum term of revenue participation right payments		10 years
Royalty Agreement [Member]
Royalty Agreement [Line Items]
Revenue participation right payments	$ 25.0
Fair value of warrants issued in connection with participation agreement	$ 3.1

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Financial Instruments - Summary of Changes in Fair Value of Company's Level 3 Financial Liabilities (Detail) - Warrant Liability [Member] $ in Thousands	6 Months Ended
	Jun. 30, 2015 USD ($)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Beginning Balance	$ 3,543
Change in fair value of warrant liability	(1,778)
Ending Balance	$ 1,765

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License Agreements - Additional Information (Detail) - USD ($) $ in Millions	1 Months Ended
	Dec. 31, 2013	Jun. 30, 2015	Jan. 31, 2014
License Agreement Terms [Member] | Millennium License Agreements [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Potential pre-commercialization milestone payments payable			$ 9.2
Potential pre-commercialization payments receivable		$ 57.5
Biogen Idec [Member] | Development Events [Member]
Research And Development Arrangement Contract To Perform For Others [Line Items]
Milestone payment depending on development	$ 2.5

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Notes Payable - Additional Information (Detail) - Loan Agreement		6 Months Ended
	Feb. 27, 2015 USD ($) Loan $ / shares shares	Jun. 30, 2015 USD ($) Tranches Installment	Sep. 30, 2012 USD ($)	Sep. 19, 2012	Oct. 31, 2011 USD ($)	Oct. 18, 2011
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 25,000,000
Number of tranches for maximum borrowing | Tranches		2
Number of installments | Installment		32
Line of credit facility final payment		$ 937,500
Notes payable [Member]
Debt Instrument [Line Items]
Loan Agreement monthly arrears and interest date		Mar. 01, 2013
Expiration date		Oct. 01, 2015
February 27, 2015 Loan Amendment
Debt Instrument [Line Items]
Line of credit facility final payment	$ 1,162,500
Expiration date	Oct. 01, 2016
Interest only period start date	Mar. 01, 2015
Interest only period end date	Feb. 01, 2016
Number of remaining principal payments | Loan	8
Prepayment penalty expiration date	Feb. 29, 2016
Percentage of penalty for prepaying loan before maturity	2.00%
Warrants Expiration Term	5 years
Number of warrants issued | shares	61,467
Warrants exercise price for shares | $ / shares	$ 2.22
Estimated fair value of warrants	$ 100,000
February 27, 2015 Loan Amendment | Weighted Average [Member]
Debt Instrument [Line Items]
Weighted average annual effective interest rate on notes payable, including amortization of debt discounts and accretion	13.80%
Tranche one [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity					$ 10,000,000
Date of Loan and Security Agreement		Oct. 31, 2011
Interest rate						8.95%
Tranche two [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 15,000,000
Line of credit facility remaining amount drawing date		Sep. 30, 2012
Interest rate				9.00%

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Financial Instruments

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Financial Instruments

4. Financial Instruments

Financial Assets

The following tables summarize the estimated fair value of the Company’s financial assets measured on a recurring basis as of the dates indicated, which were comprised solely of available-for-sale marketable securities with remaining contractual maturities of one year or less (in thousands):

June 30, 2015	Input Level	Amortized Cost			Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Money market funds	Level 1	$	7,422		$	—	$	—		$	7,422
U.S. certificates of deposit	Level 1		8,246			—		—			8,246
U.S. corporate debt obligations	Level 2		8,447			—		(4	)		8,443
U.S. commercial paper	Level 2		3,498			—		(1	)		3,497
Total available-for-sale securities			27,613			—		(5	)		27,608
Less amounts classified as cash equivalents			(8,354	)		—		—			(8,354	)
Amounts classified as marketable securities		$	19,259		$	—	$	(5	)	$	19,254

December 31, 2014	Input Level	Amortized Cost			Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Money market funds	Level 1	$	9,287		$	—	$	—		$	9,287
U.S. certificates of deposit	Level 1		6,360			—		—			6,360
U.S. corporate debt obligations	Level 2		11,789			—		(7	)		11,782
U.S. commercial paper	Level 2		2,898			—		—			2,898
Total available-for-sale securities			30,334			—		(7	)		30,327
Less amounts classified as cash equivalents			(9,532	)		—		—			(9,532	)
Amounts classified as marketable securities		$	20,802		$	—	$	(7	)	$	20,795

The following table summarizes the available-for-sale securities that were in an unrealized loss position as of the date indicated, having been in such a position for less than 12 months, and none having been deemed to be other-than-temporarily impaired (in thousands):

June 30, 2015	Gross Unrealized Losses		Estimated Fair Value
U.S. corporate debt obligations	$	4	$	7,274
U.S. commercial paper		1		2,498
	$	5	$	9,772

No significant facts or circumstances have arisen to indicate that there has been any deterioration in the creditworthiness of the issuers of these securities. The gross unrealized losses are not considered to be significant and have generally been for relatively short durations. The Company does not intend to sell these securities before maturity and it is not likely that they will need to be sold prior to the recovery of their amortized cost basis. There were no sales of available-for-sale securities during either the six months ended June 30, 2015 or 2014.

Financial Liabilities

The following table summarizes the inputs and assumptions and estimated fair value of the Company’s financial liabilities measured at fair value on a recurring basis as of the dates indicated, which were comprised solely of a liability for warrants issued in connection with the 2010 Offering:

	June 30, 2015			December 31, 2014
Inputs and assumptions:
Fair market value of Company’s common stock	$	3.01		$	2.55
Exercise price	$	2.52		$	2.52
Expected term (years)		0.3			0.8
Expected volatility		52.2	%		144.9	%
Risk-free interest rate		0.02	%		0.19	%
Expected dividend yield		0.00	%		0.00	%
Fair value:
Estimated fair value per warrant share	$	0.60		$	1.21
Shares underlying outstanding warrants classified as    liabilities (in thousands)		2,920			2,920
Total estimated fair value of outstanding warrants    (in thousands)	$	1,765		$	3,543

The warrants have been classified as a liability on the Company’s balance sheet due to the potential for the warrants to be settled in cash upon the occurrence of certain transactions specified in the warrant agreements. At each balance sheet date, the estimated fair value of the outstanding warrants is determined using the Black-Scholes model and recorded to the balance sheet, with the change in fair value recorded to other income (expense), net in the statements of operations and comprehensive loss, and the fair value of warrant exercises transferred to additional paid-in capital. During the six months ended June 30, 2015, no warrants to purchase shares of common stock issued in connection with the 2010 Offering were exercised.

The Black-Scholes model requires Level 3 inputs such as the expected term of the warrants and share price volatility. These inputs are subjective and generally require significant analysis and judgment to develop. Any changes in these inputs could result in a significantly higher or lower fair value measurement.

The following table summarizes the changes in the fair value of the Company’s Level 3 financial liabilities for the period indicated (in thousands):

	Warrant Liability
Balance as of December 31, 2014	$	3,543
Change in fair value of warrant liability		(1,778	)
Exercise of warrants		—
Balance as of June 30, 2015	$	1,765

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Notes Payable - Summary of Future Minimum Payments Under Loan Agreement (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	[1]
Debt Instrument [Line Items]
Notes payable, balance	$ 7,674
Less current portion of notes payable	(3,253)	$ (9,257)
Non-current portion of notes payable	4,421
Notes payable [Member]
Debt Instrument [Line Items]
2015	306
2016	7,154
Total minimum payments	7,460
Less amount representing interest	(640)
Notes payable, gross	6,820
Unamortized discount on notes payable	(114)
Accretion of final payment	$ 968

[1] The condensed consolidated balance sheet as of December 31, 2014 has been derived from the audited financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.

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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	[1]
Current assets:
Cash and cash equivalents	$ 20,302	$ 22,186
Marketable securities	19,254	20,795
Prepaids and other current assets	1,165	1,223
Total current assets	40,721	44,204
Property and equipment, net	19	42
Total assets	40,740	44,246
Current liabilities:
Accounts payable	2,282	3,177
Accrued clinical expense	2,249	3,112
Accrued compensation	1,245	2,287
Other accrued liabilities	4,072	3,087
Current portion of deferred revenue	3,418	3,418
Current portion of notes payable	3,253	9,257
Warrant liability	1,765	3,543
Total current liabilities	18,284	27,881
Non-current portion of deferred revenue	854	$ 2,563
Non-current portion of notes payable	$ 4,421
Commitments
Stockholders’ equity:
Common stock	$ 7	$ 7
Additional paid-in capital	557,953	536,499
Accumulated other comprehensive loss	(5)	(7)
Accumulated deficit	(540,774)	(522,697)
Total stockholders’ equity	17,181	13,802
Total liabilities and stockholders’ equity	$ 40,740	$ 44,246

[1] The condensed consolidated balance sheet as of December 31, 2014 has been derived from the audited financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.

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Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2015

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The financial statements include all adjustments (consisting only of normal recurring adjustments) that management believes are necessary for a fair presentation of the periods presented. The balance sheet as of December 31, 2014 was derived from the audited financial statements as of that date. These interim financial results are not necessarily indicative of results to be expected for the full year or any other period. These unaudited condensed consolidated financial statements and the notes accompanying them should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”), that will supersede most existing revenue recognition guidance under US GAAP. The core principle of the guidance is that an entity should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. Entities can choose to apply the standard using either the full retrospective approach or a modified retrospective approach. Entities electing the full retrospective adoption will apply the standard to each period presented in the financial statements. This means that entities will have to apply the new guidance as if it had been in effect since the inception of all its contracts with customers presented in the financial statements. Entities that elect the modified retrospective approach will apply the guidance retrospectively only to the most current period presented in the financial statements. This means that entities will have to recognize the cumulative effect of initially applying the new standard as an adjustment to the opening balance of retained earnings at the date of initial application. The new revenue standard will be applied to contracts that are in progress at the date of initial application. As currently issued, the standard will be effective for annual and interim periods beginning after December 15, 2016; however in July 2015, the FASB agreed to defer the effective date of the new standard by one year to annual and interim periods beginning after December 15, 2017. The Company has yet to evaluate which adoption method it plans to use or the potential effect of the new standard on its consolidated financial statements.

In August 2014, the FASB issued Accounting Standards Update No. 2014-15, Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern (“ASU 2014-15”), which will require a reporting entity to evaluate, at each annual and interim reporting period, whether there are conditions or events that raise substantial doubt about the reporting entity's ability to continue as a going concern within one year after the date the financial statements are issued and provide related disclosures. The standard will be effective for annual and interim periods beginning after December 15, 2016, with early adoption permitted. The Company has yet to evaluate the potential effect of the new standard on its consolidated financial statements.

Principles of Consolidation

The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries, Sunesis Europe Limited, a United Kingdom corporation, and Sunesis Pharmaceuticals (Bermuda) Ltd., a Bermuda corporation, as well as a Bermuda limited partnership, Sunesis Pharmaceuticals International LP. All intercompany balances and transactions have been eliminated in consolidation.

Segment Reporting

Management has determined that the Company operates as a single reportable segment.

Significant Estimates and Judgments

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the Company’s consolidated financial statements and accompanying notes thereto. Actual results could differ materially from these estimates. Estimates, assumptions and judgments made by management include those related to the valuation of equity and related instruments, revenue recognition, stock-based compensation and clinical trial accounting.

Cash Equivalents and Marketable Securities

Invoices for certain services provided to the Company are denominated in foreign currencies. To manage the risk of future movements in foreign exchange rates that would affect such amounts, the Company may purchase certain European currencies or highly-rated investments denominated in those currencies, subject to similar criteria as for other investments defined in the Company’s investment policy. There is no guarantee that the related gains and losses will substantially offset each other, and the Company may be subject to significant exchange gains or losses as currencies fluctuate from quarter to quarter. To date, the Company has purchased Euros and Euro-denominated obligations of foreign governments and corporate debt. As of June 30, 2015 and December 31, 2014, the Company held cash and investments denominated in Euros with an aggregate fair value of $0.7 million and $0, respectively. Any cash, cash equivalent and marketable securities balances denominated in foreign currencies are recorded at their fair value based on the current exchange rate as of each balance sheet date. The resulting exchange gains or losses and those from amounts payable for services originally denominated in foreign currencies are recorded in other income (expense), net in the statements of operations and comprehensive loss.

Fair Value Measurements

The Company measures cash equivalents, marketable securities and warrant liabilities at fair value on a recurring basis using the following hierarchy to prioritize valuation inputs, in accordance with applicable GAAP:

Level 1 - quoted prices (unadjusted) in active markets for identical assets and liabilities that can be accessed at the measurement date.

Level 2 - inputs other than quoted prices included within Level 1 that are observable, either directly or indirectly.

Level 3 - unobservable inputs.

The Company’s Level 2 valuations of marketable securities are generally derived from independent pricing services based upon quoted prices in active markets for similar securities, with prices adjusted for yield and number of days to maturity, or based on industry models using data inputs, such as interest rates and prices that can be directly observed or corroborated in active markets.

The fair value of the Company’s liability for warrants issued in connection with an underwritten offering completed in October 2010 (the “2010 Offering”) is determined using the Black-Scholes model, which requires inputs such as the expected term of the warrants, share price volatility, expected dividend yield and risk-free interest rate. As some of these inputs are unobservable, and require significant analysis and judgment to measure, these variables are classified as Level 3.

The Company does not measure cash, prepayments, accounts payable, accrued liabilities, deferred revenue and notes payable at fair value, as their carrying amounts approximated their fair value as of June 30, 2015 and December 31, 2014.

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Subsequent Events - Additional information (Detail) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	6 Months Ended
	Jul. 31, 2015	Jun. 30, 2015	Jun. 30, 2014
Subsequent Event [Line Items]
Proceeds from issuance of common stock through controlled equity offering facilities, net		$ 17,675	$ 4,726
Controlled Equity Offering Facilities [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Common stock, shares sold		6,834,978
Price per common share		$ 2.65
Proceeds from issuance of common shares and warrants in offering, gross		$ 18,100
Proceeds from issuance of common stock through controlled equity offering facilities, net		$ 17,700
Subsequent Event | Controlled Equity Offering Facilities [Member] | Common Stock [Member]
Subsequent Event [Line Items]
Common stock, shares sold	124,100
Price per common share	$ 3.70
Proceeds from issuance of common shares and warrants in offering, gross	$ 500
Proceeds from issuance of common stock through controlled equity offering facilities, net	$ 400

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Loss per Common Share - Computation of Basic and Diluted Loss per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Numerator:
Net loss—basic	$ (8,949)	$ (11,781)	$ (18,077)	$ (26,354)
Adjustment for change in fair value of warrant liability	(1,867)	(333)	1,778	(4,604)
Net loss—diluted	$ (10,816)	$ (12,114)	$ (18,077)	$ (26,354)
Denominator:
Weighted-average common shares outstanding—basic	72,513	60,246	70,090	58,291
Dilutive effect of warrants	12	1,649
Weighted-average common shares outstanding—diluted	72,525	61,895	70,090	58,291
Net loss per common share:
Basic	$ (0.12)	$ (0.20)	$ (0.26)	$ (0.45)
Diluted	$ (0.15)	$ (0.20)	$ (0.26)	$ (0.45)

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Financial Instruments - Fair Value of Company's Financial Assets Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities, Amortized Cost	$ 27,613	$ 30,334
Available-for-sale securities, Gross Unrealized Losses	(5)	(7)
Available-for-sale securities, Estimated Fair Value	27,608	30,327
Less amounts classified as cash equivalents, Amortized Cost	(8,354)	(9,532)
Amounts classified as marketable securities, Amortized Cost	19,259	20,802
Amounts classified as marketable securities, Gross Unrealized Losses	(5)	(7)
Less amounts classified as cash equivalents, Estimated Fair Value	(8,354)	(9,532)
Amounts classified as marketable securities, Estimated Fair Value	19,254	20,795	[1]
Level 1 [Member] | Money market funds [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities, Amortized Cost	7,422	9,287
Available-for-sale securities, Estimated Fair Value	7,422	9,287
Level 1 [Member] | U.S. certificates of deposit [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities, Amortized Cost	8,246	6,360
Available-for-sale securities, Estimated Fair Value	8,246	6,360
Level 2 [Member] | U.S. corporate debt obligations [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities, Amortized Cost	8,447	11,789
Available-for-sale securities, Gross Unrealized Losses	(4)	(7)
Available-for-sale securities, Estimated Fair Value	8,443	11,782
Level 2 [Member] | U.S. commercial paper [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Available-for-sale securities, Amortized Cost	3,498	2,898
Available-for-sale securities, Gross Unrealized Losses	(1)
Available-for-sale securities, Estimated Fair Value	$ 3,497	$ 2,898

[1] The condensed consolidated balance sheet as of December 31, 2014 has been derived from the audited financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.

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Loss per Common Share

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Loss per Common Share

3. Loss per Common Share

Basic loss per common share is calculated by dividing net loss by the weighted-average number of common shares outstanding for the period. Diluted loss per common share is computed by dividing (a) net loss, less any anti-dilutive amounts recorded during the period for the change in the fair value of warrant liabilities, by (b) the weighted-average number of common shares outstanding for the period plus dilutive potential common shares as determined using the treasury stock method for options and warrants to purchase common stock.

The following table sets forth the computation of basic and diluted loss per common share for the periods presented (in thousands, except per share amounts):

	Three months ended June 30,						Six months ended June 30,
	2015			2014			2015			2014
Numerator:
Net loss—basic	$	(8,949	)	$	(11,781	)	$	(18,077	)	$	(26,354	)
Adjustment for change in fair value of warrant liability		(1,867	)		(333	)		—			—
Net loss—diluted	$	(10,816	)	$	(12,114	)	$	(18,077	)	$	(26,354	)
Denominator:
Weighted-average common shares outstanding—basic		72,513			60,246			70,090			58,291
Dilutive effect of warrants		12			1,649			—			—
Weighted-average common shares outstanding—diluted		72,525			61,895			70,090			58,291
Net loss per common share:
Basic	$	(0.12	)	$	(0.20	)	$	(0.26	)	$	(0.45	)
Diluted	$	(0.15	)	$	(0.20	)	$	(0.26	)	$	(0.45	)

The following table represents the potential common shares issuable pursuant to outstanding securities as of the related period end dates that were excluded from the computation of diluted loss per common share because their inclusion would have had an anti-dilutive effect (in thousands):

	Three months ended June 30,				Six months ended June 30,
	2015		2014		2015		2014
Warrants to purchase shares of common stock		9,040		16,139		11,960		19,171
Options to purchase shares of common stock		10,422		9,321		10,422		9,321
Restricted stock units		233		—		233		—
Outstanding securities not included in calculations		19,695		25,460		22,615		28,492

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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue:
License and other revenue	$ 854	$ 1,989	$ 1,708	$ 3,984
Total revenues	854	1,989	1,708	3,984
Operating expenses:
Research and development	6,302	7,206	10,814	14,758
General and administrative	5,175	6,387	10,286	9,804
Total operating expenses	11,477	13,593	21,100	24,562
Loss from operations	(10,623)	(11,604)	(19,392)	(20,578)
Interest expense	(233)	(470)	(472)	(1,017)
Other income (expense), net	1,907	293	1,787	(4,759)
Net loss	(8,949)	(11,781)	(18,077)	(26,354)
Unrealized gain (loss) on available-for-sale securities		(11)	2	(4)
Comprehensive loss	(8,949)	(11,792)	(18,075)	(26,358)
Net loss:
Basic	(8,949)	(11,781)	(18,077)	(26,354)
Diluted	$ (10,816)	$ (12,114)	$ (18,077)	$ (26,354)
Shares used in computing net loss per common share:
Basic	72,513	60,246	70,090	58,291
Diluted	72,525	61,895	70,090	58,291
Net loss per common share:
Basic	$ (0.12)	$ (0.20)	$ (0.26)	$ (0.45)
Diluted	$ (0.15)	$ (0.20)	$ (0.26)	$ (0.45)

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Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value of Company's Financial Assets Measured on Recurring Basis

The following tables summarize the estimated fair value of the Company’s financial assets measured on a recurring basis as of the dates indicated, which were comprised solely of available-for-sale marketable securities with remaining contractual maturities of one year or less (in thousands):

June 30, 2015	Input Level	Amortized Cost			Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Money market funds	Level 1	$	7,422		$	—	$	—		$	7,422
U.S. certificates of deposit	Level 1		8,246			—		—			8,246
U.S. corporate debt obligations	Level 2		8,447			—		(4	)		8,443
U.S. commercial paper	Level 2		3,498			—		(1	)		3,497
Total available-for-sale securities			27,613			—		(5	)		27,608
Less amounts classified as cash equivalents			(8,354	)		—		—			(8,354	)
Amounts classified as marketable securities		$	19,259		$	—	$	(5	)	$	19,254

December 31, 2014	Input Level	Amortized Cost			Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Money market funds	Level 1	$	9,287		$	—	$	—		$	9,287
U.S. certificates of deposit	Level 1		6,360			—		—			6,360
U.S. corporate debt obligations	Level 2		11,789			—		(7	)		11,782
U.S. commercial paper	Level 2		2,898			—		—			2,898
Total available-for-sale securities			30,334			—		(7	)		30,327
Less amounts classified as cash equivalents			(9,532	)		—		—			(9,532	)
Amounts classified as marketable securities		$	20,802		$	—	$	(7	)	$	20,795

Summary of Available-for-Sale Securities in Unrealized Loss Position

The following table summarizes the available-for-sale securities that were in an unrealized loss position as of the date indicated, having been in such a position for less than 12 months, and none having been deemed to be other-than-temporarily impaired (in thousands):

June 30, 2015	Gross Unrealized Losses		Estimated Fair Value
U.S. corporate debt obligations	$	4	$	7,274
U.S. commercial paper		1		2,498
	$	5	$	9,772

Summary of Assumptions and Estimated Fair Value of Company's Financial Liabilities Measured on Recurring Basis

The following table summarizes the inputs and assumptions and estimated fair value of the Company’s financial liabilities measured at fair value on a recurring basis as of the dates indicated, which were comprised solely of a liability for warrants issued in connection with the 2010 Offering:

	June 30, 2015			December 31, 2014
Inputs and assumptions:
Fair market value of Company’s common stock	$	3.01		$	2.55
Exercise price	$	2.52		$	2.52
Expected term (years)		0.3			0.8
Expected volatility		52.2	%		144.9	%
Risk-free interest rate		0.02	%		0.19	%
Expected dividend yield		0.00	%		0.00	%
Fair value:
Estimated fair value per warrant share	$	0.60		$	1.21
Shares underlying outstanding warrants classified as    liabilities (in thousands)		2,920			2,920
Total estimated fair value of outstanding warrants    (in thousands)	$	1,765		$	3,543

Summary of Changes in Fair Value of Company's Level 3 Financial Liabilities

The following table summarizes the changes in the fair value of the Company’s Level 3 financial liabilities for the period indicated (in thousands):

	Warrant Liability
Balance as of December 31, 2014	$	3,543
Change in fair value of warrant liability		(1,778	)
Exercise of warrants		—
Balance as of June 30, 2015	$	1,765

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Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Trading Symbol	SNSS
Entity Registrant Name	SUNESIS PHARMACEUTICALS INC
Entity Central Index Key	0001061027
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		75,470,899

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Notes Payable (Tables)

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Summary of Future Minimum Payments Under Loan Agreement

Aggregate future minimum payments due under the Loan Agreement as of June 30, 2015 were as follows (in thousands):

Year ending December 31,	Total
2015	$	306
2016		7,154
Total minimum payments		7,460
Less amount representing interest		(640	)
Notes payable, gross		6,820
Unamortized discount on notes payable		(114	)
Accretion of final payment		968
Notes payable, balance		7,674
Less current portion of notes payable		(3,253	)
Non-current portion of notes payable	$	4,421

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015		Jun. 30, 2014
Cash flows from operating activities
Net loss	$ (18,077)		$ (26,354)
Adjustments to reconcile loss to net cash used in operating activities:
Stock-based compensation expense	3,332		2,770
Depreciation and amortization	22		11
Amortization of debt discount and debt issuance costs	75		217
Change in fair value of warrant liability	(1,778)		4,604
Changes in operating assets and liabilities:
Prepaids and other assets	54		57
Accounts payable	(895)		(440)
Accrued clinical expense	(863)		(812)
Accrued compensation	(1,042)		(431)
Other accrued liabilities	1,074		2,730
Deferred revenue	(1,709)		(3,978)
Net cash used in operating activities	(19,807)		(21,626)
Cash flows from investing activities
Purchases of property and equipment			(23)
Purchases of marketable securities	(18,927)		(32,934)
Proceeds from maturities of marketable securities	20,470		25,320
Net cash provided by (used in) investing activities	1,543		(7,637)
Cash flows from financing activities
Principal payments on notes payable	(1,642)		(4,573)
Proceeds from issuance of common stock and warrants in underwritten offering, net			40,012
Proceeds from issuance of common stock through controlled equity offering facilities, net	17,675		4,726
Proceeds from exercise of warrants, stock options and stock purchase rights	347		738
Net cash provided by financing activities	16,380		40,903
Net (decrease) increase in cash and cash equivalents	(1,884)		11,640
Cash and cash equivalents at beginning of period	22,186	[1]	15,121
Cash and cash equivalents at end of period	20,302		$ 26,761
Supplemental disclosure of non-cash activities
Fair value of warrants issued in connection with notes payable	$ 100

[1] The condensed consolidated balance sheet as of December 31, 2014 has been derived from the audited financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.

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Stockholders' Equity

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Stockholders' Equity

8. Stockholders’ Equity

Controlled Equity Offerings

In August 2011, the Company entered into a Controlled Equity Offering^SM sales agreement (the “Sales Agreement”), with Cantor Fitzgerald & Co. (“Cantor”), as agent and/or principal, pursuant to which the Company could issue and sell shares of its common stock having an aggregate gross sales price of up to $20.0 million. In April 2013, the Sales Agreement was amended to provide for an increase of $30.0 million in the aggregate gross sales price under the Sales Agreement. In March 2015, the Sales Agreement was further amended to provide for an additional increase of $30.0 million in the aggregate gross sales price under the Sales Agreement. The Company will pay Cantor a commission of up to 3.0% of the gross proceeds from any common stock sold through the Sales Agreement, as amended.

During the six months ended June 30, 2015, the Company sold 6,834,978 shares of common stock under the Sales Agreement, as amended, at an average price of approximately $2.65 per share for gross proceeds of $18.1 million and net proceeds of $17.7 million, after deducting Cantor’s commission. As of June 30, 2015, $18.7 million of common stock remained available to be sold under this facility, subject to certain conditions as specified in the Sales Agreement, as amended.

In July 2015, the Company has sold 124,100 shares of common stock under the Sales Agreement, as amended, at $3.70 per share for gross proceeds of $0.5 million and net proceeds of $0.4 million, after deducting Cantor’s commission. As of July 30, 2015, $18.2 million of common stock remains available to be sold under this facility.

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Notes Payable

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Notes Payable

7. Notes Payable

In October 2011, the Company entered into a Loan and Security Agreement (the “Loan Agreement”) with Oxford Finance LLC, Silicon Valley Bank and Horizon Technology Finance Corporation (collectively, the “Lenders”), under which the Company could borrow up to $25.0 million in two tranches (the “Loan Facility”). The first tranche of $10.0 million was funded upon closing of the transaction in October 2011, and the second tranche of $15.0 million was drawn by the Company in September 2012. In connection with the Loan Agreement, the Lenders were granted a perfected first priority security interest in substantially all of the Company’s assets, other than intellectual property.

The interest rates for the first and second tranche are 8.95% and 9.00% per annum, respectively. Payments under the Loan Agreement are monthly in arrears and were interest-only until February 1, 2013, and were to be followed by 32 equal monthly payments of principal and interest from March 1, 2013 to the original maturity date of October 1, 2015. In addition, a final payment equal to $937,500 was to be due on October 1, 2015, or such earlier date as specified in the Loan Agreement.

On February 27, 2015, the Company entered into an amendment (the “Amendment”), to the Loan Agreement with the Lenders. The Amendment modifies the loan repayment terms to be interest-only from March 1, 2015 to February 1, 2016, followed by eight equal monthly payments of principal and interest through the new maturity date of October 1, 2016. In addition, the final payment was increased to $1,162,500, and will become due on the new maturity date, or such earlier date specified in the Loan Agreement. If the Company repays all or a portion of the loan prior to February 29, 2016 as part of a refinancing with another lender, a prepayment fee equal to 2% of the then outstanding principal balance will be due to the Lenders. The remaining balance of the final payment that has yet to be expensed is being accreted as interest expense through the new maturity date using the effective interest method.

In connection with the Amendment, the Lenders were issued five-year warrants to purchase an aggregate of up to 61,467 shares of the Company’s common stock at a per share exercise price of $2.22. The fair value of these warrants was estimated to be $0.1 million using the Black-Scholes valuation model. The fair value of these warrants was recorded at issuance as a debt discount within notes payable and an increase to additional paid-in capital on the Company’s balance sheet. The balance of the debt discount, including the fair value of these warrants, is being amortized as interest expense over the remaining term of the Loan Agreement, as amended, using the effective interest method.

The weighted average annual effective interest rate of the notes payable under the revised amortization schedule is 13.8%.

Aggregate future minimum payments due under the Loan Agreement as of June 30, 2015 were as follows (in thousands):

Year ending December 31,	Total
2015	$	306
2016		7,154
Total minimum payments		7,460
Less amount representing interest		(640	)
Notes payable, gross		6,820
Unamortized discount on notes payable		(114	)
Accretion of final payment		968
Notes payable, balance		7,674
Less current portion of notes payable		(3,253	)
Non-current portion of notes payable	$	4,421

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Loss per Common Share - Schedule of Potential Common Shares Issuable Pursuant to Outstanding Securities Excluded from Computation of Diluted Loss per Common Share (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Outstanding securities not included in calculations	19,695	25,460	22,615	28,492
Warrants to purchase shares of common stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Outstanding securities not included in calculations	9,040	16,139	11,960	19,171
Options to purchase shares of common stock [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Outstanding securities not included in calculations	10,422	9,321	10,422	9,321
Restricted stock units [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Outstanding securities not included in calculations	233		233

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Stock-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2015

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Stock-Based Compensation Expense Related to Company's Stock-Based Awards

The following table summarizes stock-based compensation expense related to the Company’s stock-based awards for the periods indicated (in thousands):

	Three months ended June 30,				Six months ended June 30,
	2015		2014		2015		2014
Research and development	$	595	$	519	$	1,293	$	978
General and administrative		718		837		1,876		1,564
Employee stock-based compensation expense		1,313		1,356		3,169		2,542
Non-employee stock-based compensation expense		55		108		163		228
Total stock-based compensation expense	$	1,368	$	1,464	$	3,332	$	2,770

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Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2015

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The financial statements include all adjustments (consisting only of normal recurring adjustments) that management believes are necessary for a fair presentation of the periods presented. The balance sheet as of December 31, 2014 was derived from the audited financial statements as of that date. These interim financial results are not necessarily indicative of results to be expected for the full year or any other period. These unaudited condensed consolidated financial statements and the notes accompanying them should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”), that will supersede most existing revenue recognition guidance under US GAAP. The core principle of the guidance is that an entity should recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. Entities can choose to apply the standard using either the full retrospective approach or a modified retrospective approach. Entities electing the full retrospective adoption will apply the standard to each period presented in the financial statements. This means that entities will have to apply the new guidance as if it had been in effect since the inception of all its contracts with customers presented in the financial statements. Entities that elect the modified retrospective approach will apply the guidance retrospectively only to the most current period presented in the financial statements. This means that entities will have to recognize the cumulative effect of initially applying the new standard as an adjustment to the opening balance of retained earnings at the date of initial application. The new revenue standard will be applied to contracts that are in progress at the date of initial application. As currently issued, the standard will be effective for annual and interim periods beginning after December 15, 2016; however in July 2015, the FASB agreed to defer the effective date of the new standard by one year to annual and interim periods beginning after December 15, 2017. The Company has yet to evaluate which adoption method it plans to use or the potential effect of the new standard on its consolidated financial statements.

In August 2014, the FASB issued Accounting Standards Update No. 2014-15, Disclosure of Uncertainties about an Entity's Ability to Continue as a Going Concern (“ASU 2014-15”), which will require a reporting entity to evaluate, at each annual and interim reporting period, whether there are conditions or events that raise substantial doubt about the reporting entity's ability to continue as a going concern within one year after the date the financial statements are issued and provide related disclosures. The standard will be effective for annual and interim periods beginning after December 15, 2016, with early adoption permitted. The Company has yet to evaluate the potential effect of the new standard on its consolidated financial statements.

Principles of Consolidation

Principles of Consolidation

The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries, Sunesis Europe Limited, a United Kingdom corporation, and Sunesis Pharmaceuticals (Bermuda) Ltd., a Bermuda corporation, as well as a Bermuda limited partnership, Sunesis Pharmaceuticals International LP. All intercompany balances and transactions have been eliminated in consolidation.

Segment Reporting

Segment Reporting

Management has determined that the Company operates as a single reportable segment.

Significant Estimates and Judgments

Significant Estimates and Judgments

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the Company’s consolidated financial statements and accompanying notes thereto. Actual results could differ materially from these estimates. Estimates, assumptions and judgments made by management include those related to the valuation of equity and related instruments, revenue recognition, stock-based compensation and clinical trial accounting.

Cash Equivalents and Marketable Securities

Cash Equivalents and Marketable Securities

Invoices for certain services provided to the Company are denominated in foreign currencies. To manage the risk of future movements in foreign exchange rates that would affect such amounts, the Company may purchase certain European currencies or highly-rated investments denominated in those currencies, subject to similar criteria as for other investments defined in the Company’s investment policy. There is no guarantee that the related gains and losses will substantially offset each other, and the Company may be subject to significant exchange gains or losses as currencies fluctuate from quarter to quarter. To date, the Company has purchased Euros and Euro-denominated obligations of foreign governments and corporate debt. As of June 30, 2015 and December 31, 2014, the Company held cash and investments denominated in Euros with an aggregate fair value of $0.7 million and $0, respectively. Any cash, cash equivalent and marketable securities balances denominated in foreign currencies are recorded at their fair value based on the current exchange rate as of each balance sheet date. The resulting exchange gains or losses and those from amounts payable for services originally denominated in foreign currencies are recorded in other income (expense), net in the statements of operations and comprehensive loss.

Fair Value Measurements

Fair Value Measurements

The Company measures cash equivalents, marketable securities and warrant liabilities at fair value on a recurring basis using the following hierarchy to prioritize valuation inputs, in accordance with applicable GAAP:

Level 1 - quoted prices (unadjusted) in active markets for identical assets and liabilities that can be accessed at the measurement date.

Level 2 - inputs other than quoted prices included within Level 1 that are observable, either directly or indirectly.

Level 3 - unobservable inputs.

The Company’s Level 2 valuations of marketable securities are generally derived from independent pricing services based upon quoted prices in active markets for similar securities, with prices adjusted for yield and number of days to maturity, or based on industry models using data inputs, such as interest rates and prices that can be directly observed or corroborated in active markets.

The fair value of the Company’s liability for warrants issued in connection with an underwritten offering completed in October 2010 (the “2010 Offering”) is determined using the Black-Scholes model, which requires inputs such as the expected term of the warrants, share price volatility, expected dividend yield and risk-free interest rate. As some of these inputs are unobservable, and require significant analysis and judgment to measure, these variables are classified as Level 3.

The Company does not measure cash, prepayments, accounts payable, accrued liabilities, deferred revenue and notes payable at fair value, as their carrying amounts approximated their fair value as of June 30, 2015 and December 31, 2014.

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Stock-Based Compensation

6 Months Ended

Jun. 30, 2015

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation

9. Stock-Based Compensation

Employee stock-based compensation expense is calculated based on the grant-date fair value of awards ultimately expected to vest, and is recorded on a straight-line basis over the vesting period of the awards. Forfeitures are estimated at the time of grant, based on historical option cancellation information, and revised in subsequent periods if actual forfeitures differ from those estimates.

The following table summarizes stock-based compensation expense related to the Company’s stock-based awards for the periods indicated (in thousands):

	Three months ended June 30,				Six months ended June 30,
	2015		2014		2015		2014
Research and development	$	595	$	519	$	1,293	$	978
General and administrative		718		837		1,876		1,564
Employee stock-based compensation expense		1,313		1,356		3,169		2,542
Non-employee stock-based compensation expense		55		108		163		228
Total stock-based compensation expense	$	1,368	$	1,464	$	3,332	$	2,770

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Subsequent Events

6 Months Ended

Jun. 30, 2015

Subsequent Events [Abstract]

Subsequent Events

10. Subsequent Events

In July 2015, the Company has sold 124,100 shares of common stock under the Sales Agreement, as amended, at $3.70 per share for gross proceeds of $0.5 million and net proceeds of $0.4 million, after deducting Cantor’s commission. See Note 8 for further details.

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Loss per Common Share (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Computation of Basic and Diluted Loss per Common Share

The following table sets forth the computation of basic and diluted loss per common share for the periods presented (in thousands, except per share amounts):

	Three months ended June 30,						Six months ended June 30,
	2015			2014			2015			2014
Numerator:
Net loss—basic	$	(8,949	)	$	(11,781	)	$	(18,077	)	$	(26,354	)
Adjustment for change in fair value of warrant liability		(1,867	)		(333	)		—			—
Net loss—diluted	$	(10,816	)	$	(12,114	)	$	(18,077	)	$	(26,354	)
Denominator:
Weighted-average common shares outstanding—basic		72,513			60,246			70,090			58,291
Dilutive effect of warrants		12			1,649			—			—
Weighted-average common shares outstanding—diluted		72,525			61,895			70,090			58,291
Net loss per common share:
Basic	$	(0.12	)	$	(0.20	)	$	(0.26	)	$	(0.45	)
Diluted	$	(0.15	)	$	(0.20	)	$	(0.26	)	$	(0.45	)

Schedule of Potential Common Shares Issuable Pursuant to Outstanding Securities Excluded from Computation of Diluted Loss per Common Share

The following table represents the potential common shares issuable pursuant to outstanding securities as of the related period end dates that were excluded from the computation of diluted loss per common share because their inclusion would have had an anti-dilutive effect (in thousands):

	Three months ended June 30,				Six months ended June 30,
	2015		2014		2015		2014
Warrants to purchase shares of common stock		9,040		16,139		11,960		19,171
Options to purchase shares of common stock		10,422		9,321		10,422		9,321
Restricted stock units		233		—		233		—
Outstanding securities not included in calculations		19,695		25,460		22,615		28,492

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Stock-Based Compensation - Summary of Stock-Based Compensation Expense Related to Company's Stock-Based Awards (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation, Allocation and Classification in Financial Statements
Total stock-based compensation expense	$ 1,368	$ 1,464	$ 3,332	$ 2,770
Employee stock-based compensation expense [Member]
Share-based Compensation, Allocation and Classification in Financial Statements
Total stock-based compensation expense	1,313	1,356	3,169	2,542
Non-employee stock-based compensation expense [Member]
Share-based Compensation, Allocation and Classification in Financial Statements
Total stock-based compensation expense	55	108	163	228
Research and development [Member]
Share-based Compensation, Allocation and Classification in Financial Statements
Total stock-based compensation expense	595	519	1,293	978
General and administrative [Member]
Share-based Compensation, Allocation and Classification in Financial Statements
Total stock-based compensation expense	$ 718	$ 837	$ 1,876	$ 1,564

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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($) Segment	Dec. 31, 2014 USD ($)
Accounting Policies [Abstract]
Number of reportable segment | Segment	1
Fair value of investments denominated in Euros	$ 0.7	$ 0.0

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Financial Instruments - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Sales of available-for-sale securities	$ 0	$ 0
2010 Offering [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Warrants exercised for cash, shares	0

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Company Overview

6 Months Ended

Jun. 30, 2015

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Company Overview

1. Company Overview

Description of Business

Sunesis Pharmaceuticals, Inc. (the “Company” or “Sunesis”) was incorporated in the state of Delaware on February 10, 1998, and its facilities are located in South San Francisco, California. Sunesis is a biopharmaceutical company focused on the development and commercialization of new oncology therapeutics for the treatment of solid and hematologic cancers. The Company’s primary activities since incorporation have been conducting research and development internally and through corporate collaborators, in-licensing and out-licensing pharmaceutical compounds and technology, conducting clinical trials and raising capital.

In October 2014, the Company announced the results of a Phase 3, multi-national, randomized, double-blind, placebo-controlled, clinical trial of vosaroxin in combination with cytarabine in patients with relapsed or refractory acute myeloid leukemia (the “VALOR trial”). The trial did not meet its primary endpoint of demonstrating a statistically significant improvement in overall survival. Based upon the results of other predefined analyses of the data and feedback from meetings held in June 2015 with its European Rapporteur and Co-Rapporteur, who are two appointed members of the European Medicines Agency (“EMA”) Committee of Human Medicinal Products, Sunesis plans to file a marketing authorization application (“MAA”) with the EMA as soon as practicable. Based upon a meeting with the U.S. Food and Drug Administration (“FDA”) held in July 2015, the FDA recommended that the Company provide additional clinical evidence prior to any regulatory filing in the U.S. As a result, the Company plans to evaluate regulatory and clinical strategies with the goal of gaining future marketing approval in the U.S.

Significant Risks and Uncertainties

The Company has incurred significant losses and negative cash flows from operations since its inception, and as of June 30, 2015, had cash, cash equivalents and marketable securities totaling $39.6 million and an accumulated deficit of $540.8 million.

The Company will need to raise substantial additional capital to pursue a regulatory strategy for the potential commercialization of QINPREZO^TM(vosaroxin), its product candidate for the potential treatment of acute myeloid leukemia, and to continue the development of vosaroxin and the Company’s other programs. The Company expects to finance its future cash needs primarily through equity issuances, debt arrangements, one or more possible licenses, collaborations or other similar arrangements with respect to development and/or commercialization rights to vosaroxin and its other development programs, or a combination of the above. However, the Company does not know whether additional funding will be available on acceptable terms, or at all. If the Company is unable to raise required funding on acceptable terms or at all, it will need to reduce operating expenses, enter into a collaboration or other similar arrangement with respect to development and/or commercialization rights to vosaroxin, outlicense intellectual property rights to vosaroxin or our other development programs, sell unsecured assets, or a combination of the above, or be forced to delay or reduce the scope of its vosaroxin development program, potentially including any regulatory filings related to the VALOR trial, and/or limit or cease its operations.

Concentrations of Credit Risk

In accordance with its investment policy, the Company invests cash that is not currently being used for operational purposes. The policy allows for the purchase of low risk debt securities issued by: (a) the United States and certain European governments and government agencies, and (b) highly rated banks and corporations, denominated in U.S. dollars, Euros or British pounds, subject to certain concentration limits. The policy limits maturities of securities purchased to no longer than 24 months and the weighted average maturity of the portfolio to 12 months. Management believes these guidelines ensure both the safety and liquidity of any investment portfolio the Company may hold.

Financial instruments that potentially subject the Company to concentrations of credit risk generally consist of cash, cash equivalents and marketable securities. The Company is exposed to credit risk in the event of default by the institutions holding its cash, cash equivalents and any marketable securities to the extent of the amounts recorded in the balance sheets.

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License Agreements

6 Months Ended

Jun. 30, 2015

Goodwill And Intangible Assets Disclosure [Abstract]

License Agreements

6. License Agreements

Biogen Idec

In December 2013, the Company entered into a second amended and restated collaboration agreement with Biogen Idec MA, Inc. (the “Biogen Idec 2nd ARCA”), to provide the Company with an exclusive worldwide license to develop, manufacture and commercialize SNS-062, a BTK inhibitor synthesized under the first amended and restated collaboration agreement with Biogen Idec (the “Biogen Idec 1st ARCA”), solely for oncology indications. The Company may be required to make a $2.5 million milestone payment depending on its development of SNS-062 and royalty payments depending on related product sales of SNS-062. All other of Sunesis’ rights and obligations contained in the Biogen Idec 1st ARCA remain unchanged, except that potential future royalty payments to Sunesis were reduced to equal those amounts due to Biogen Idec for potential future sales of SNS-062.

Millennium

In March 2011, Millennium Pharmaceuticals, Inc., a wholly-owned subsidiary of Takeda Pharmaceutical Company Limited (“Millennium”) purchased and exclusively licensed Biogen Idec’s rights to a PDK1 inhibitor program and a pan-Raf inhibitor program which were both originally developed through a collaboration agreement between Sunesis and Biogen Idec. In January 2014, the Company entered into an amended and restated license agreement with Millennium (the “Amended Millennium Agreement”), to provide the Company with an exclusive worldwide license to develop and commercialize preclinical inhibitors of PDK1. In connection with the execution of the Amended Millennium Agreement, the Company paid an upfront fee and may be required to make up to $9.2 million in pre-commercialization milestone payments depending on its development of PDK1 inhibitors and royalty payments depending on related product sales, if any.

With respect to the pan-Raf inhibitor program, the Company may in the future receive up to $57.5 million in pre-commercialization event-based payments related to the development by Millennium of the first two indications for each of the licensed products directed against the Raf target and royalty payments depending on related product sales. Under this program, Millennium is currently conducting Phase 1 clinical studies of an oral investigative drug, MLN2480.

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Financial Instruments - Summary of Assumptions and Estimated Fair Value of Company's Financial Liabilities Measured on Recurring Basis (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Inputs and assumptions:
Fair market value of Company’s common stock	$ 3.01	$ 2.55
Exercise price	$ 2.52	$ 2.52
Expected term (years)	3 months 18 days	9 months 18 days
Expected volatility	52.20%	144.90%
Risk-free interest rate	0.02%	0.19%
Expected dividend yield	0.00%	0.00%
Fair value:
Estimated fair value per warrant share	$ 0.60	$ 1.21
Shares underlying outstanding warrants classified as liabilities (in thousands)	2,920	2,920
Total estimated fair value of outstanding warrants (in thousands)	$ 1,765	$ 3,543	[1]

[1] The condensed consolidated balance sheet as of December 31, 2014 has been derived from the audited financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.

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Company Overview - Additional Information (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014	[1]
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Date of incorporation	Feb. 10, 1998
Cash, cash equivalents and marketable securities	$ 39,600
Accumulated deficit	$ 540,774	$ 522,697
Maturity limits period	24 months
Dollars weighted average maturity limit period	12 months

[1] The condensed consolidated balance sheet as of December 31, 2014 has been derived from the audited financial statements as of that date included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014.