Patients undergo blood sample, tissue biopsy, mucosal scraping, and saliva collection at baseline and periodically during study. Samples are analyzed for markers of angiogenic activity (VEGF, sVEGFR-2, sKIT, ICAM, and PDGF), pharmacokinetic studies, gene expression profile, and human papilloma virus DNA by enzyme linked immunosorbent assay (ELISA), immunohistochemistry, fluorescence in situ hybridization (FISH), and PCR.