Exhibit 99.1

ARIAD Announces Temporary Suspension of Iclusig Marketing in the United States

Investor conference call today, October 31, at 9:00 a.m. E.T.

CAMBRIDGE, Mass.--(BUSINESS WIRE)--October 31, 2013--ARIAD Pharmaceuticals, Inc. (NASDAQ:ARIA) today announced that it is temporarily suspending the marketing and commercial distribution of Iclusig^® (ponatinib), a treatment for patients with resistant or intolerant chronic myeloid leukemia (CML) and Philadelphia-chromosome positive acute lymphoblastic leukemia (Ph+ ALL), in the United States, while it continues to negotiate updates to the U.S. prescribing information for Iclusig and implementation of a risk mitigation strategy.

The Company’s actions have been taken in response to a request by the U.S. Food and Drug Administration (FDA) yesterday afternoon. ARIAD believes that Iclusig is an important medicine for patients with resistant or intolerant Philadelphia-positive leukemias and is actively working with the FDA on actions to achieve the resumption of marketing of Iclusig.

Today’s Conference Call at 9:00 a.m. ET

ARIAD management will host a conference call and webcast to discuss these actions today, October 31 at 9:00 a.m. ET. The live webcast can be accessed by visiting the investor relations section of the Company’s website at http://investor.ariad.com. The call can be accessed by dialing 800-510-0146 (U.S.) or +1 617-614-3449 (international) and providing the participant code 74034136. A replay of the call will be available on the ARIAD website approximately two hours after completion of the call and will be archived for three weeks.

About Iclusig^® (ponatinib)

Iclusig is a kinase inhibitor. The primary target for Iclusig is BCR-ABL, an abnormal tyrosine kinase that is expressed in chronic myeloid leukemia (CML) and Philadelphia-chromosome positive acute lymphoblastic leukemia (Ph+ ALL). Iclusig was designed using ARIAD’s computational and structure-based drug design platform specifically to inhibit the activity of BCR-ABL. Iclusig targets not only native BCR-ABL but also its isoforms that carry mutations that confer resistance to treatment, including the T315I mutation, a common mutation which has been associated with resistance to other approved TKIs.

Indication, Usage and Dosing

Iclusig is indicated for the treatment of adult patients with chronic phase, accelerated phase, or blast phase chronic myeloid leukemia (CML) that is resistant or intolerant to prior tyrosine kinase inhibitor (TKI) therapy or Philadelphia chromosome-positive acute lymphoblastic leukemia (Ph+ ALL) that is resistant or intolerant to prior TKI therapy.

This indication is based upon response rate. There are no trials verifying an improvement in disease-related symptoms or increased survival with Iclusig.

The recommended dose of Iclusig is a 45 mg tablet taken once-daily with or without food.

Important Safety Information

Boxed Warning

Arterial Thrombosis: Cardiovascular, cerebrovascular, and peripheral vascular thrombosis, including fatal myocardial infarction and stroke have occurred in Iclusig-treated patients. In clinical trials, serious arterial thrombosis occurred in 8% of Iclusig-treated patients. Interrupt and consider discontinuation of Iclusig in patients who develop arterial thrombotic events.

Hepatotoxicity: Hepatotoxicity, liver failure and death have occurred in Iclusig-treated patients. Monitor hepatic function prior to and during treatment. Interrupt and then reduce or discontinue Iclusig for hepatotoxicity.

Warnings and Precautions

Congestive Heart Failure: Twenty patients treated with Iclusig (4%) experienced serious congestive heart failure (CHF) or left ventricular dysfunction (LVD), with 4 fatalities. Thirty-three patients treated with Iclusig (7%) experienced any grade of CHF or LVD. Monitor patients for signs or symptoms consistent with CHF and treat as clinically indicated, including interruption of Iclusig. Consider discontinuation of Iclusig in patients who develop serious CHF.

Hypertension: Eight patients treated with Iclusig (2%) experienced treatment-emergent symptomatic hypertension as a serious adverse reaction, including hypertensive crisis. Treatment-emergent hypertension (defined as systolic BP≥140 mm Hg or diastolic BP≥90 mm Hg on at least one occasion) occurred in 67% of patients (300/449). Monitor and manage blood pressure elevations.

Pancreatitis: Clinical pancreatitis occurred in 6% of patients (5% Grade 3) treated with Iclusig. The incidence of treatment emergent lipase elevation was 41%. Check serum lipase every 2 weeks for the first 2 months and then monthly thereafter or as clinically indicated. Dose interruption or reduction may be required. In cases where lipase elevations are accompanied by abdominal symptoms, interrupt treatment with Iclusig and evaluate patients for pancreatitis.

Hemorrhage: Serious bleeding events occurred in 5% (22/449) of patients treated with Iclusig, including fatalities. Hemorrhagic events occurred in 24% of patients. The incidence of serious bleeding events was higher in patients with AP-CML, BP-CML, and Ph+ ALL. Most events occurred in patients with grade 4 thrombocytopenia. Interrupt Iclusig for serious or severe hemorrhage.

Fluid Retention: Serious fluid retention events occurred in 3% of patients treated with Iclusig. One instance of brain edema was fatal. Monitor patients for fluid retention and manage patients as clinically indicated. Interrupt, reduce, or discontinue Iclusig as clinically indicated.

Cardiac Arrhythmias: Symptomatic bradyarrhythmias that led to a requirement for pacemaker implantation occurred in 3 (1%) Iclusig-treated patients. Advise patients to report signs and symptoms suggestive of slow heart rate (fainting, dizziness, or chest pain). Supraventricular tachyarrhythmias occurred in 5% of Iclusig-treated patients. Atrial fibrillation was the most common supraventricular tachyarrhythmia and occurred in 20 patients. For 13 patients, the event led to hospitalization. Advise patients to report signs and symptoms of rapid heart rate (palpitations, dizziness).

Myelosuppression: Severe (Grade 3 or 4) myelosuppression occurred in 48% (215/449) of patients treated with Iclusig. The incidence of these events was greater in patients with AP-CML, BP-CML and Ph+ ALL than in patients with CP-CML. Obtain complete blood counts every 2 weeks for the first 3 months and then monthly or as clinically indicated, and adjust the dose as recommended.

Tumor Lysis Syndrome: Two patients (<1%) with advanced disease (AP-CML, BP-CML, or Ph+ ALL) treated with Iclusig developed serious tumor lysis syndrome. Hyperuricemia occurred in 7%(30/449) of patients overall; the majority had CP-CML (19 patients). Ensure adequate hydration and treat high uric acid levels prior to initiating therapy with Iclusig.

Compromised Wound Healing and Gastrointestinal Perforation: Since Iclusig may compromise wound healing, interrupt Iclusig for at least 1 week prior to major surgery. Serious gastrointestinal perforation (fistula) occurred in one patient 38 days post-cholecystectomy.

Embryo-Fetal Toxicity: Iclusig can cause fetal harm. If Iclusig is used during pregnancy, or if the patient becomes pregnant while taking Iclusig, the patient should be apprised of the potential hazard to the fetus. Advise women to avoid pregnancy while taking Iclusig.

Adverse Reactions

The most common non-hematologic adverse reactions (≥20%) were hypertension, rash, abdominal pain, fatigue, headache, dry skin, constipation, arthralgia, nausea, and pyrexia. Hematologic adverse reactions included thrombocytopenia, anemia, neutropenia, lymphopenia, and leukopenia. Please see the full U.S. Prescribing Information for Iclusig, including the Boxed Warning.

About ARIAD

ARIAD Pharmaceuticals, Inc., headquartered in Cambridge, Massachusetts and Lausanne, Switzerland, is an integrated global oncology company focused on transforming the lives of cancer patients with breakthrough medicines. ARIAD is working on new medicines to advance the treatment of various forms of chronic and acute leukemia, lung cancer and other difficult-to-treat cancers. ARIAD utilizes computational and structural approaches to design small-molecule drugs that overcome resistance to existing cancer medicines. For additional information, visit http://www.ariad.com or follow ARIAD on Twitter (@ARIADPharm).

This press release contains “forward-looking statements” including, but not limited to, statements about ongoing regulatory discussions regarding the suspension of marketing of Iclusig in the United States and negotiations concerning U.S. prescribing information and the risk mitigation strategy for Iclusig. Forward-looking statements are based on management's expectations and are subject to certain factors, risks and uncertainties that may cause actual results, outcome of events, timing and performance to differ materially from those expressed or implied by such statements. These risks and uncertainties and other factors are detailed under the heading “Risk Factors” in Part I, Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2012 and any updates to those risk factors contained in our subsequent periodic and current reports filed with the U.S. Securities and Exchange Commission. The information contained in this press release is believed to be current as of the date of original issue. We do not intend to update any of the forward-looking statements after the date of this document to conform these statements to actual results or to changes in our expectations, except as required by law.

CONTACT:
ARIAD Pharmaceuticals, Inc.
For Investors
Maria Cantor, 617-621-2208
maria.cantor@ariad.com
or
Kendra Adams, 617-503-7028
kendra.adams@ariad.com
or
For Media
Jeffrey Krasner, 617-503-7390
jeffrey.krasner@ariad.com