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Immunomedics Announces Orphan Drug Designation For IMMU-132 For Small Cell Lung Cancer Therapy

MORRIS PLAINS, N.J., Dec. 4, 2013 (GLOBE NEWSWIRE) -- Immunomedics, Inc. (Nasdaq:IMMU), a biopharmaceutical company primarily focused on the development of monoclonal antibody-based products for the targeted treatment of cancer, autoimmune and other serious diseases, today announced that IMMU-132, the Company's antibody-drug conjugate for solid cancer therapy, has received orphan drug status from the Office of Orphan Products Development of the U.S. Food and Drug Administration (FDA) for the treatment of small cell lung cancer (SCLC).

"We are pleased to receive the orphan designation for IMMU-132 from the FDA," remarked Cynthia L. Sullivan, President and Chief Executive Officer. "In addition to small cell lung cancer, the agent is currently in Phase II clinical development focusing on a few select types of solid cancers," Ms. Sullivan added.

In an early Phase I clinical study, IMMU-132 has produced partial responses in patients with small cell lung cancer, colorectal cancer, and triple negative breast cancer.

IMMU-132 is an active antibody-drug conjugate containing the humanized anti-TROP-2 antibody, hRS7, conjugated by a pH sensitive linker to SN-38. TROP-2 is expressed by many human tumors, such as cancers of the breast, cervix, colon and rectum, kidney, liver, lung, ovary, pancreas, and prostate, but with only limited expression in normal human tissues. hRS7 internalizes into cancer cells following binding to TROP-2, making it a suitable candidate for the delivery of cytotoxic drugs.

SN-38 is the active metabolite of irinotecan, which is a standard therapy for patients with metastatic colorectal cancer, but has major gastrointestinal and hematologic toxicity. By attaching SN-38 to tumor-targeting antibodies, delivery of SN-38 to the tumor may be increased several-fold while mitigating systemic toxicity.

Orphan drug status is granted by the FDA to a drug or biological product to treat a rare disease or condition upon request of a sponsor. Orphan drug designation qualifies the Company for various development incentives, including tax credits for qualified clinical testing, a waiver from the FDA's application User Fee for marketing application, and a seven-year period of marketing exclusivity in the United States for IMMU-132, if it is approved by the FDA for the treatment of patients with SCLC.

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