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Oncothyreon Announces Data For L-BLP25 And PX-866 To Be Presented At American Society Of Clinical Oncology Meeting

SEATTLE, May 16, 2013 /PRNewswire/ - Oncothyreon Inc. (NASDAQ: ONTY) today announced that the following presentations of data for L-BLP25 (formerly known as Stimuvax) and PX-866 will take place at the American Society of Clinical Oncology (ASCO) 2013 Annual Meeting in Chicago:

Abstract #7500 START - A Phase III study of L-BLP25 cancer immunotherapy for unresectable stage III non-small cell lung cancer. Charles A. Butts, MD, FRCPC Oral Abstract Session - Lung Cancer Tuesday, June 4 9:45 AM - 10:00 AM

Abstract #2053 Phase II study of PX-866 in recurrent glioblastoma. Marshall W. Pitz, MD, FRCPC General Poster Session - CNS tumors Saturday, June 1 8:00 AM - 11:45 AM

Abstract #5042 NCIC CTG, IND-205: A phase II study of PX-866 in patients with recurrent or metastatic castration resistant prostate cancer (CRPC). Sebastien J. Hotte, MD, MSc General Poster Session - Genitourinary Cancer Monday June 3 8:00 AM - 11:45 AM

L-BLP25 - In connection with the upcoming presentation, Oncothyreon today announced detailed results from the randomized Phase III START trial of the investigational MUC1 antigen-specific cancer immunotherapy L-BLP25 (formerly referred to as Stimuvax) in patients with unresectable, locally advanced Stage III non-small cell lung cancer (NSCLC). The trial was conducted by Merck Serono, a division of Merck KGaA, Darmstadt, Germany, under a license agreement with Oncothyreon. The primary endpoint of improving overall survival (OS) was not met. In a predefined subgroup of patients receiving initial concurrent chemoradiotherapy (CRT), a combination of chemotherapy and radiotherapy given at the same time, a median overall survival of 30.8 months versus 20.6 months was observed based on a post hoc analysis in patients treated with L-BLP25 versus placebo respectively (HR 0.78, 95% CI 0.64-0.95, p=0.016, n=806).

The START trial is assessing the safety, efficacy and tolerability of L-BLP25 in patients with unresectable, locally advanced Stage III NSCLC who have not progressed after initial CRT, which is the current standard of care. Before receiving treatment with either L-BLP25 or placebo in the START trial, two-thirds of patients had received concurrent CRT and one-third had received sequential CRT (radiotherapy started after completion of chemotherapy). The trial did not meet its primary objective of demonstrating a significantly improved OS with L-BLP25 compared to placebo in the primary analysis study population (n=1,239). Median OS was 25.6 months for patients in the L-BLP25 group compared with 22.3 months for those in the placebo group (adjusted HR 0.88, 95% CI 0.75-1.03, p=0.123). In a post hoc analysis of the predefined subgroup of patients receiving initial concurrent CRT (n=806), patients receiving L-BLP25 had a median OS of 30.8 months compared to patients receiving placebo, who had a median OS of 20.6 months [HR 0.78; 95% CI 0.64-0.95; p=0.016]). In patients receiving sequential CRT followed by L-BLP25 or placebo a median OS of 19.4 months was observed for the L-BLP25 group compared with 24.6 months for the placebo group (n=433; HR 1.12; 95% CI 0.87-1.44; p=0.38). Predefined subgroup analyses included, among others, disease stage (IIIA or IIIB), response to initial CRT (stable disease versus objective response), type of initial CRT (concurrent versus sequential) and geographic region.

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