An Extension Treatment Protocol for Subjects Who Have Participated in a Study of Tivozanib Versus Sorafenib in Kidney Carcinoma (Protocol AV-951-09-301).

Open-label, multi-center extension treatment protocol to allow access to tivozanib and sorafenib for subjects who have participated on the AV-951-09-301 protocol. Eligible subjects who were randomized to receive sorafenib on AV-951-09-301 and had documented progression of disease will receive a tivozanib dose of 1.5 mg/day. Eligible subjects who were randomized to tivozanib or sorafenib in AV-951-09-301, and displayed clinical benefit and acceptable tolerability to treatment, will continue to receive tivozanib or sorafenib at the same dose and schedule as in AV-951-09-301.