VX-222 is a small molecule non-nucleoside inhibitor of HCV NS5B polymerase that is being investigated for the treatment of hepatitis C virus infection.
Vertex is currently conducting the first clinical trial to evaluate telaprevir dosed in combination with VX-222. This Phase 2 proof-of-concept trial is designed to evaluate SVR, or viral cure, rates using multiple 12-week response-guided regimens of telaprevir/VX-222-based combination therapy, including two-drug regimens that contain only telaprevir and VX-222. Vertex expects to obtain on-treatment clinical data from this trial in the second half of 2010.