R306465, a histone deacetylase (HDAC) inhibitor, is a new drug in development for cancer. In this study, the safety (the effect on the body) of R306465 in patients with advanced cancer will be studied and the maximum dose that can be tolerated by these patients will be determined. The absorption, break down, and elimination of the drug will be studied. Antitumor activity of R306465 will be evaluated.