8-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported) August 31, 2010

Progenics Pharmaceuticals, Inc.

(Exact name of registrant as specified in its charter)

Delaware	000-23143	13-3379479
(State or other jurisdiction of incorporation)	(Commission File Number)	(IRS Employer Identification No.)
777 Old Saw Mill River Road, Tarrytown, New York		10591
(Address of principal executive offices)		(Zip Code)
Registrant's telephone number, including area code (914) 789-2800

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

o Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Item 8.01. Other Events.

Progenics Pharmaceuticals, Inc. (NASDAQ: PGNX) today announced that it will present preclinical findings for its humanized monoclonal antibodies that bind and neutralize toxins produced by the bacterium Clostridium difficile in a September 13th poster session at the forthcoming 50th annual Interscience Conference on Antimicrobial Agents and Chemotherapy (ICAAC) to be held in Boston next month.

A copy of Progenics’ press release is attached hereto as Exhibit 99.1 and the information contained therein is incorporated by reference into this Item 8.01 of this Current Report on Form 8-K.

Item 9.01   Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.     Description

99.1     Press Release dated August 31, 2010.

SIGNATURES

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 hereunto duly authorized.

PROGENICS PHARMACEUTICALS, INC.

          By:  /s/ ROBERT A. MCKINNEY                            

Robert A. McKinney

                                                Chief Financial Officer, Senior Vice President,

                              Finance & Operations and Treasurer

Date:  August 31, 2010

EX-99.1

Contact:   Investors:   Dory A. Kurowski Director, Corporate Affairs (914) 789-2818 dkurowski@progenics.com     Media:   Aline Schimmel Scienta Communications (312) 238-8957 aschimmel@scientapr.com

PROGENICS PHARMACEUTICALS TO PRESENT PRECLINICAL STUDY OF NOVEL MONOCLONAL ANTIBODIES AGAINST C. DIFFICILE AT 2010 ICAAC

Tarrytown, NY, August 31, 2010 – Progenics Pharmaceuticals, Inc. (Nasdaq: PGNX) announced today that the Company will present preclinical findings for its humanized monoclonal antibodies that bind and neutralize the potentially life-threatening toxins produced by the bacterium, Clostridium difficile (C. difficile).  The findings will be presented in a poster session at the 50th annual Interscience Conference on Antimicrobial Agents and Chemotherapy (ICAAC) in Boston, MA.

Presentation details are as follows:

Poster Title: Mechanism of Action Studies of Novel Monoclonal Antibodies against Clostridium difficile Toxins

Date/Time: Monday September 13, from 11:15 am to 1:15 pm Eastern Time

Session: 094. New Discovery Methodologies

Abstract Number: F2-881

Location: Exhibit Hall B1

About Clostridium difficile

Clostridium difficile (C. difficile) is an anaerobic, spore-forming bacterium that represents the leading cause of hospital-acquired diarrhea and life-threatening pseudomembranous colitis.  C. difficile-associated disease (CDAD) affects more than 750,000 individuals each year in the U.S. and is responsible for more deaths than all other intestinal infections combined. Recent outbreaks of hypervirulent strains have been reported globally, significantly increasing the economic burden of CDAD and requiring new treatment strategies to combat this worldwide public health challenge.

CDAD is mediated by two toxins, A and B, that can damage the cells that line the colon. CDAD often occurs when an individual is exposed to C. difficile while taking antibiotics, since a course of antibiotic treatment can disrupt the normal intestinal bacteria, providing opportunities for C. difficile to become established. Although current therapies are generally effective in treating CDAD, the disease frequently relapses.  Progenics’ monoclonal antibodies are designed to block the cytotoxic effects of C. difficile toxins and enable the normal bacteria in the colon to become re-established.

(PGNX-G)

About Progenics

Progenics Pharmaceuticals, Inc., of Tarrytown, NY, is a biopharmaceutical company focusing on the development and commercialization of innovative therapeutic products to treat the unmet medical needs of patients with debilitating conditions and life-threatening diseases. Principal programs are directed toward supportive care, oncology and virology. Progenics is developing RELISTOR®(methylnaltrexone bromide) for the treatment of opioid-induced constipation. RELISTOR is now approved in over 50 countries, including the U.S., E.U., Canada, Australia and Brazil. Progenics is pursuing strategic alternatives for RELIST OR, including licensing, collaboration, strategic alliances and U.S. commercialization or co-promotion, following termination of its 2005 collaboration with Wyeth Pharmaceuticals*, which is continuing manufacturing, sales, marketing, clinical, and certain development and regulatory activities for RELISTOR during the transition. Ono Pharmaceutical Co., Ltd. has an exclusive license from Progenics for development and commercialization of subcutaneous RELISTOR in Japan. In oncology, the Company is conducting a phase 1 clinical trial of PSMA ADC, a human monoclonal antibody-drug conjugate for the treatment of prostate cancer. PSMA is a protein found on the surface of prostate cancer cells as well as in blood vessels supplying other solid tumors. In virology, Progenics is also developing the viral-entry inhibitor PRO 140, a humanized monoclonal antibody which binds to co-receptor CCR5 to inhibit human immunodeficiency virus (HIV) infection. PRO 140 is currently in phase 2 clinical testing. In early development, P rogenics is evaluating novel antibodies to toxins produced by the bacteria C. difficile, as well as single-agent multiplex PI3-Kinase inhibitors as a potential strategy to combat some of the most aggressive forms of cancer, and is also seeking to identify novel inhibitors of HCV entry.

PROGENICS DISCLOSURE NOTICE: This document contains statements that do not relate strictly to historical fact, any of which may be forward-looking statements within the meaning of the U.S. Private Securities Litigation Reform Act of 1995. When we use the words "anticipates," "plans," "expects" and similar expressions, we are identifying forward-looking statements. Forward-looking statements involve known and unknown risks and uncertainties which may cause our actual results, performance or achievements to be materially different from those expressed or implied by forward-looking statements. While it is impossible to identify or predict all such matters, these differences may result from, among other things, t he inherent uncertainty of the timing and success of, and expense associated with, research, development, regulatory approval and commercialization of our products and product candidates, including the risks that clinical trials will not commence or proceed as planned; products appearing promising in early trials will not demonstrate efficacy or safety in larger-scale trials; clinical trial data on our products and product candidates will be unfavorable; our products will not receive marketing approval from regulators or, if approved, do not gain sufficient market acceptance to justify development and commercialization costs; competing products currently on the market or in development might reduce the commercial potential of our products; we, our collaborators or others might identify side effects after the product is on the market; or efficacy or safety concerns regarding marketed products, whether or not originating from subsequent testing or other activities by us, governmental regulators, other entities or organizations or otherwise, and whether or not scientifically justified, may lead to product recalls, withdrawals of marketing approval, reformulation of the product, additional pre-clinical testing or clinical trials, changes in labeling of the product, the need for additional marketing applications, declining sales or other adverse events.

We are also subject to risks and uncertainties associated with the actions of our corporate, academic and other collaborators and government regulatory agencies, including risks from market forces and trends; potential product liability; intellectual property, litigation, environmental and other risks; the risk that we may not be able to enter into favorable collaboration or other relationships or that existing or future relationships may not proceed as planned; the risk that current and pending patent protection for our products may be invalid, unenforceable or challenged, or fail to provide adequate market exclusivity, or that our rights to in-licensed intellectual property may be terminated for our failure to satisfy performance milestones; the risk of difficulties in, and regulat ory compliance relating to, manufacturing products; and the uncertainty of our future profitability.

Risks and uncertainties also include general economic conditions, including interest and currency exchange-rate fluctuations and the availability of capital; changes in generally accepted accounting principles; the impact of legislation and regulatory compliance; the highly regulated nature of our business, including government cost-containment initiatives and restrictions on third-party payments for our products; trade buying patterns; the competitive climate of our industry; and other factors set forth in our Annual Report on Form 10-K and other reports filed with the U.S. Securities and Exchange Commission. In particular, we cannot assure you that RELISTOR will be commercially successful or be approved in the future in other formulations, indications or jurisdictions, or that any of our other programs will result in a commercial product.

We do not have a policy of updating or revising forward-looking statements and we assume no obligation to update any statements as a result of new information or future events or developments. It should not be assumed that our silence over time means that actual events are bearing out as expressed or implied in forward-looking statements.

* Wyeth is now part of Pfizer Inc.

Editors Note:

For more information, please visit www.progenics.com.