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90Y-Epratuzumab Study Shows Improvement Of Therapy Results Following R-CHOP

Stocks in this article: IMMU

VANCOUVER, British Columbia, June 10, 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 reported that adding two doses of epratuzumab labeled with the radioisotope, yttrium-90 ( 90Y), to a combination of rituximab and CHOP chemotherapy (R-CHOP), the standard of care for patients with diffuse large B-cell lymphoma (DLBCL), appeared to improve elderly patients' responses to treatment.

DLBCL is the most common type of aggressive non-Hodgkin lymphoma (NHL), with approximately 20,000 new patients diagnosed each year in the United States. Although the standard therapy for DLBCL is R-CHOP, elderly patients who fail R-CHOP have a poor outcome. Due to advanced age, chemo-resistant disease, and/or concurrent co-morbid medical conditions, a significant percentage of these patients are not eligible for high-dose salvage therapy or stem cell transplant. Consequently, there is a need for an alternative therapy for high-risk patients with a lower chance of being cured with standard R-CHOP.

Epratuzumab is a humanized antibody that binds to the CD22 receptor on B cells. In various clinical trials, epratuzumab was found to be active as an unlabeled antibody in patients with NHL or lupus. Previous clinical studies have also demonstrated that repeated administration of small doses of 90Y-epratuzumab (fractionated RAIT) produced high rates of durable responses in NHL patients. 1

Results from a multicenter Phase II trial sponsored by the GOELAMS/LYSA French study group were updated by Françoise Kraeber-Bodéré, MD, PhD, Nuclear Medicine Department, Hôtel-Dieu University Hospital,, Nantes, France, in an oral presentation at the Society of Nuclear Medicine and Molecular Imaging 2013 Annual Meeting. The objective of this study is to evaluate 90Y-epratuzumab given in multiple, small doses as consolidation therapy after R-CHOP in previously untreated elderly patients with advanced DLBCL, using 2-year event-free survival (EFS) as the primary end-point.

At the time of reporting, a total of 75 patients between the ages of 60 and 79 years had been enrolled to receive 3 cycles of R-CHOP therapy. Patients who reported a partial response or better proceeded to receive 3 additional cycles of R-CHOP, followed 6 – 8 weeks later by 2 once-a-week infusions of 90Y-epratuzumab at the 15 mCi/m 2 dose level. In all, 61 patients were eligible for the radioimmunotherapy (RIT) with 90Y-epratuzumab.

The overall response rate (ORR) after 6 cycles of R-CHOP therapy was 94.6% (71/75), with 52 patients (69.3%) achieving a complete or unconfirmed complete response (CR/CRu) and 19 patients (25.3%) reporting a partial response (PR). At a median follow-up of 27.5 months (range from 1 - 46), 18 patients had disease progression and/or related death, yielding an estimated 2-year EFS of 75.4% (63.7 - 83.9%) and an estimated 2-year overall survival (OS) of 83.2% (72.6 - 90.7%).

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