EXAM Trial Design
EXAM is an international, randomized, placebo-controlled, double-blinded study of cabozantinib in patients with progressive, unresectable, locally advanced, or metastatic MTC. Patients were randomized in a 2:1 ratio to receive cabozantinib or placebo administered at a daily dose of 175 mg. The study did not allow for cross-over from the placebo arm to cabozantinib. With an enrollment target of 315 patients and a planned event-driven analysis, the trial provides 90% power to detect a 75% increase in progression-free survival, the primary endpoint of the study. Additionally the study is designed to assess overall survival at a later time point once those events have been achieved, and is powered to detect a 50% improvement in survival compared with placebo. Exelixis is conducting this trial under a SPA from the FDA, which allows for full approval on the basis of PFS if the data are supportive. EXAM completed enrollment in the first quarter of 2011.
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