Stimuvax investigational lung cancer vaccine phase III study starts

Feb 26 2007

Merck KGaA today announced that the first patient has been enrolled in its global Phase III clinical study, START (Stimulating Targeted Antigenic Responses To NSCLC), assessing the efficacy and safety of Stimuvax (BLP25 liposome vaccine) as a potential treatment for patients with unresectable stage III non-small cell lung cancer (NSCLC).

Enrollment in the study, which will involve more than 1,300 patients in approximately 30 countries, is now open to patients in the U.S. where the first randomization has occurred. Enrollment will subsequently expand to additional countries. Currently, there are no approved maintenance therapies for patients responding to first-line treatment for unresectable stage III NSCLC.

"Patients with advanced lung cancer are in need of new therapies that effectively target cancer cells while providing better safety and tolerability," said Dr. Frances Shepherd, Director of Medical Oncology at Princess Margaret Hospital in Toronto, Ontario and lead investigator of the START study. "Novel therapeutic vaccines such as Stimuvax may help the body's immune system identify and destroy cancer cells without targeting normal, healthy cells."

Lung cancer is the leading cause of cancer-related deaths in both men and women worldwide with approximately 80 percent of cases classified as NSCLC. Further, only about 15 percent of people diagnosed with NSCLC survive this disease after five years. For most patients with NSCLC, current treatments provide limited success.

"The START study is the first Phase III program to evaluate a cancer vaccine in unresectable stage III non-small cell lung cancer and marks an important milestone for the company in its growing oncology business," said Dr. Wolfgang Wein, Senior Executive Vice President, Oncology, Merck Serono. "Our continued investment in research reflects our confidence in Stimuvax and commitment to developing innovative targeted therapies to advance treatment options for patients with cancer."

The START study is a randomized, double-blind, placebo-controlled study that will evaluate patients with documented unresectable stage III NSCLC who have had a response or stable disease after at least two cycles of platinum-based chemo-radiotherapy. The study has been designed considering scientific advice from the European Medicines Agency (EMEA/CHMP) and has been agreed upon with the U.S. Food and Drug Administration (FDA) through a Special Protocol Assessment (SPA). Data from a randomized phase IIb study encouraged the initiation of the Phase III program.

Stimuvax is an innovative cancer vaccine designed to induce an immune response to cancer cells that express MUC1, a protein antigen widely expressed on common cancers. MUC1 is over expressed on many cancers such as lung cancer, breast cancer and colorectal cancer. Stimuvax is thought to work by stimulating the body's immune system to identify and destroy cancer cells expressing MUC1.

A randomized Phase IIb study was conducted in 171 patients with stage IIIb and IV NSCLC with response or stable disease after first line therapy. While the overall study results were not statistically significant, in the randomization stratum of patients with stage IIIb locoregional disease, Stimuvax showed a median survival of 30.6 months versus 13.3 months in the control group -- an improvement of 17.3 months. In the Phase IIb study, side effects were primarily limited to mild-to-moderate flu-like symptoms, GI disturbances, and mild injection site reactions.