1. Medical Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, Laboratory of Proteomics and Analytical Technologies, SAIC-Frederick, Inc., National Cancer Institute at Frederick, Frederick, Maryland 21702, Laser Microdissection Core Facility, Laboratory of Pathology, National Cancer Institute, Bethesda, Maryland 20892, Pathogenetics Unit, Laboratory of Pathology, National Cancer Institute, Bethesda, Maryland 20892