............. 56 9.1 Tumor Tissue Studies ................................ ................................ ............................ 56 9.2 Peripheral Blood Mononuclear Cells (PBMCs) ................................ .................... 57 9.3 Serum and Plasma Marker Studies ................................ ................................ ........ 57 9.4 Stool and Oral Wash Samples Studies ................................ ................................ ...57 9.5 Diagnostic Tissue Samples ................................ ................................ .................... 58 9.6 Genomic Analysis ................................ ................................