FDA Grants Priority Review For ISTODAX® sNDA For Treatment of Progressive or Relapsed PTCL

Celgene Corporation (Nasdaq:CELG) today announced that the U.S. Food and Drug Administration (FDA) has granted Priority Review classification to its Supplemental New Drug Application (sNDA) regarding ISTODAX (romidepsin) for injection for the treatment of peripheral T-cell lymphoma (PTCL) in patients who have received at least one prior therapy. The Prescription Drug User Fee Act (PDUFA) date is June 17, 2011. Priority Review is granted to a pharmaceutical product that, if approved, would meet an unmet medical need for a serious and life-threatening condition.

The ISTODAX sNDA submission is based upon the safety and efficacy results of a Phase II, multicenter, international, open-label study of ISTODAX in progressive or relapsed PTCL following prior systemic therapy. Clinical data from this study were presented during the December 2010 meeting of the American Society of Hematology (ASH).

ISTODAX is not approved as a treatment in progressive or relapsed PTCL.

About ISTODAX

ISTODAX^® (romidepsin) for injection is a member of a class of cancer drugs known as histone deacetylase (HDAC) inhibitors. HDACs catalyze the removal of acetyl groups from acetylated lysine residues in histones, resulting in the modulation of gene expression. HDACs also deacetylate non-histone proteins, such as transcription factors. In vitro, ISTODAX causes the accumulation of acetylated histones, and induces cell cycle arrest and apoptosis of some cancer cell lines. For full prescribing information, visit www.ISTODAX.com.

ISTODAX is approved in the United States for the treatment of cutaneous T-cell lymphoma (CTCL) in patients who have received at least one prior systemic therapy.

Important Safety Information

ISTODAX® (romidepsin) for injection is indicated for treatment of cutaneous T-cell lymphoma (CTCL) in patients who have received at least one prior systemic therapy.

Important Safety Information

WARNINGS AND PRECAUTIONS:

• Due to the risk of QT prolongation, ensure that potassium and magnesium are within the normal range before administration

• Treatment with ISTODAX has been associated with thrombocytopenia, leukopenia (neutropenia and lymphopenia), and anemia; therefore, monitor these hematological parameters during treatment with ISTODAX and modify the dose as necessary

• Electrocardiographic (ECG) changes have been observed with ISTODAX

• In patients with congenital long QT syndrome, a history of significant cardiovascular disease, and patients taking anti-arrhythmic medicines or medicinal products that lead to significant QT prolongation, appropriate cardiovascular monitoring precautions should be considered, such as monitoring electrolytes and ECGs at baseline and periodically during treatment

• Based on its mechanism of action, ISTODAX may cause fetal harm when administered to a pregnant woman. If this drug is used during pregnancy, or if the patient becomes pregnant while taking ISTODAX, the patient should be apprised of the potential hazard to the fetus (Pregnancy Category D)

• ISTODAX binds to estrogen receptors. Advise women of childbearing potential that ISTODAX may reduce the effectiveness of estrogen-containing contraceptives

ADVERSE REACTIONS:

The most common Grade 3/4 adverse reactions (>5%) regardless of causality reported in Study 1 (n=102) were infections (11%) and asthenia/fatigue (8%) and in Study 2 (n=93) were lymphopenia (37%), infections (33%), neutropenia (27%), leukopenia (22%), anemia (16%), asthenia/fatigue (14%), thrombocytopenia (14%), hypophosphatemia (10%), vomiting (10%), dermatitis/exfoliative dermatitis (8%), hypermagnesemia (8%), hyperuricemia (8%), hypocalcemia (6%), nausea (6%), and pruritus (6%).

The most common adverse reactions regardless of causality in Study 1 (n=102) were nausea (56%), asthenia/fatigue (53%), infections (46%), vomiting (34%), and anorexia (23%), and in Study 2 (n=83) were nausea (86%), asthenia/fatigue (77%), anemia (72%), thrombocytopenia (65%), ECG ST-T wave changes (63%), neutropenia (57%), and lymphopenia (57%).

DRUG INTERACTIONS:

• ISTODAX is metabolized by CYP3A4. Avoid concomitant use with strong CYP3A4 inhibitors and potent CYP3A4 inducers if possible

• Caution should also be exercised with concomitant use of moderate CYP3A4 inhibitors and P-glycoprotein (P-gp, ABCB1) inhibitors

• Physicians should carefully monitor prothrombin time (PT) and International Normalized Ratio (INR) in patients concurrently administered ISTODAX and warfarin sodium derivatives

USE IN SPECIFIC POPULATIONS:

• Because many drugs are excreted in human milk and because of the potential for serious adverse reactions in nursing infants from ISTODAX, a decision should be made whether to discontinue nursing or discontinue the drug, taking into account the importance of the drug to the mother

• Patients with moderate and severe hepatic impairment and/or patients with end-stage renal disease should be treated with caution

Please see full Prescribing Information, including WARNINGS AND PRECAUTIONS, and ADVERSE REACTIONS.

About PTCL

Peripheral T-cell lymphoma comprises a heterogeneous group of malignancies of T-cell origin that account for about 10-15% of all cases of non-Hodgkin's lymphoma. PTCL can occur from young adulthood to old age and is slightly more common in men than in women. It is a particularly aggressive form of lymphoma with a short median duration of survival (approximately two years) from diagnosis.

About Celgene

Celgene Corporation, headquartered in Summit, New Jersey, is an integrated global biopharmaceutical company engaged primarily in the discovery, development and commercialization of novel therapies for the treatment of cancer and inflammatory diseases through gene and protein regulation. For more information, please visit the company’s Web site at www.celgene.com.

This release contains certain forward-looking statements which involve known and unknown risks, delays, uncertainties and other factors not under the Company's control, which may cause actual results, performance or achievements of the Company to be materially different from the results, performance or other expectations implied by these forward-looking statements. These factors include results of current or pending research and development activities, actions by the FDA and other regulatory authorities, and those factors detailed in the Company's filings with the Securities and Exchange Commission such as 10K, 10Q and 8K reports.