Biopsies of a sentinel lesion (with CT guidance or laparoscopy) are obtained at baseline and at 4 weeks. Skin biopsies of unaffected areas are also obtained at these time points. Tissue is examined using immunohistochemical methods. Proteomic profiling using surface-enhanced laser desorption/ionization with time-of-flight (SELDI-TOF) mass spectrometry is conducted on serum at baseline and then every 4 weeks.