LBH589 is a drug that may slow down the growth of cancer cells or kill cancer cells by blocking certain enzymes (proteins produced by cells). LBH589 has shown effects against cancer in laboratory studies and in studies using animals; however, it is not known if this medicine will show the same activity in humans. As of May 2006, approximately 100 patients have received treatment with either an intravenous or capsule form of LBH589. Only the capsule form of LBH589 will be used in this study.