Safety and Pharmacokinetics of XL647 Administered Orally to Subjects With Solid Tumors

Administered orally as a solution with mass-based dosing in early cohorts or as 50-mg tablets at a fixed dose at the MTD. A minimum of 3 subjects was planned for each dosing cohort with dose escalation dependent on subject tolerance of the prior dose. During the Treatment Period, subjects in each cohort were administered a single dose of XL647 on Day 1 followed by a 72-hour period of observation. If there were no XL647-related dose limiting toxicities, subjects received 5 daily doses of XL647 on Days 4-8. Twenty-one days after the initial dose, in the absence of unacceptable toxicity or disease progression, subjects could enter a Treatment Extension Period that consisted of repeated 2-week cycles of five oral doses of XL647 followed by a 9-day observation period.