SEATTLE, Sept. 25, 2013 /PRNewswire/ - Oncothyreon Inc. (NASDAQ: ONTY) today announced that Merck Serono, the biopharmaceutical division of Merck KGaA, has decided to continue clinical development of the investigational MUC1 antigen-specific cancer immunotherapy tecemotide (also known as L-BLP25 and formerly known as Stimuvax®). Merck Serono, which is developing tecemotide under a license agreement with Oncothyreon, will conduct a new Phase 3 trial called START2 for patients with unresectable, locally advanced Stage III non-small cell lung cancer (NSCLC). This decision is based on the outcome of the prior START trial. While the START trial did not meet the primary endpoint of improving overall survival (OS) in the overall patient population, data from an exploratory analysis of a predefined subgroup of patients, who received tecemotide after concurrent chemoradiotherapy (CRT), showed that these patients achieved a median OS of 30.8 months versus 20.6 months in patients treated with placebo (n=806; HR: 0.78; 95% CI 0.64-0.95; p=0.016). Concurrent CRT is a combination of chemotherapy and radiotherapy given at the same time. START2 is a Phase 3, multicenter, randomized, double-blind, placebo-controlled clinical trial designed to assess the efficacy, safety and tolerability of tecemotide in patients with unresectable, locally advanced (Stage IIIA or IIIB) NSCLC who have had a response or stable disease after at least two cycles of platinum-based concurrent CRT. Concurrent CRT is the current standard of care for these patients. The trial's primary endpoint is OS. Merck Serono also announced that it received Scientific Advice from the European Medicines Agency (EMA) on the program and has reached an agreement with the U.S. Food and Drug Administration (FDA) on a Special Protocol Assessment (SPA) for the Phase 3 international randomized trial. "The results from the START trial provided insights into the potential clinical utility of tecemotide and raised a lot of interest in the scientific community. We haven't seen this type of clinically meaningful survival benefit with any other investigational therapy in unresectable Stage III NSCLC. Further investigation might help to better understand the potential role that tecemotide could play in successfully treating these patients," said Dr. Charles Butts, Cross Cancer Institute, University of Alberta, Edmonton, Canada, clinical investigator of the START trial and member of the corresponding steering committee. Dr. Annalisa Jenkins, Head of Global Drug Development and Medical for Merck Serono, said: "The START data delivered important insights that we believe justify further investigation in a new Phase 3 program. NSCLC is a devastating disease, and we are pleased to be able to continue supporting innovation in this important emerging field of immuno-oncology." "We are pleased that Merck Serono will be moving forward with the development of tecemotide," said Robert L. Kirkman, M.D., President and Chief Executive Officer of Oncothyreon. "We believe the data from START support the validity of MUC1 as a target for immunotherapy and are gratified that Merck Serono will seek to confirm the results seen in START in patients receiving concurrent CRT in a new Phase 3 trial." About Tecemotide Tecemotide is an investigational MUC1 antigen-specific cancer immunotherapy that is designed to stimulate the body's immune system to identify and target cells expressing the cell-surface glycoprotein MUC1. MUC1 is expressed in many cancers, such as non-small cell lung cancer (NSCLC), and has multiple roles in tumor growth and survival. Tecemotide is currently being investigated in the Phase 3 START and INSPIRE trials for the treatment of unresectable, locally advanced Stage III NSCLC.