Using flow cytometry, we monitored MHC class I expression with the BB7.2 antibody [45, 46] that recognizes peptide-bound HLA-A2 (an MHC class I molecule that is expressed by S2-013 pancreatic cancer cells [55]), and with an antibody that recognizes HLA-B and HLA-C (B1.23.2) [47]. The gene discussed is HLA-B; the disease is pancreatic neoplasm.