REOLYSIN® Overview

The KRAS Opportunity

In mid-2009, the U.S. FDA approved revisions to labeling of the epidermal growth factor receptor (EGFR) class of antibodies, indicating that colorectal patients who have KRAS mutations in their tumours do not respond to EGFR-inhibiting antibodies and that the use of this class of pharmaceuticals is not recommended for these patients.

REOLYSIN, Oncolytics’ proprietary formulation of the reovirus, preferentially replicates in cancer cells that have an activated RAS pathway. Approximately two-thirds of all cancers have an activated RAS pathway, including most metastatic disease. A large number of mutations, including mutations in EGFR, Her2 or KRAS along the RAS pathway lead to RAS pathway activation. A significant clinical opportunity for REOLYSIN is in the treatment of patients with metastatic cancers including colorectal and non-small cell lung cancer who have a mutated KRAS gene and are unlikely to respond to treatment with anit-EGFR monoclonal antibodies.