Vertex Pharmaceuticals Incorporated engages in discovering, developing, manufacturing, and commercializing small molecule drugs for patients with serious diseases. Its products include telaprevir for the treatment of adults with genotype 1 hepatitis C virus (HCV) infection, which is marketed in the United States and Canada under the INCIVEK brand name; and ivacaftor for the treatment of cystic fibrosis that is marketed in the United States, Canada, and Europe under the KALYDECO brand name. The company, through its collaboration agreement with Janssen Pharmaceutica, N.V., also markets telaprevir in Europe and other countries in Janssen's territories under the INCIVO brand name, as well as in Japan under TELAVIC brand name. It is also developing drug candidates for the treatment of cystic fibrosis, including VX-809, which is in Phase III clinical trial and VX-661 that is in Phase II clinical trial; and drug candidates for the treatment of HCV infection, such as VX-135 (ALS-2200), which is in Phase II clinical trial and VX-222 that is in Phase II clinical trial. In addition, the company develops VX-509, which is in Phase II clinical trial for the treatment of autoimmune disease; and VX-787 that is in Phase II clinical trial for the treatment of influenza. Vertex Pharmaceuticals Incorporated was founded in 1989 and is headquartered in Cambridge, Massachusetts.