B2M and neoplasm: The expression levels of B2M(p = 2.926e-05), HLA-C(p = 2.628e-03), HLA-E(p = 5.5166e-08), HLA-F(p = 9.376e-03), TAP1(p = 1.972e-09), TAP2(p = 1.245e-04) and TAPBP (p = 2.652e-12)in tumor tissues of dMMR patients were significantly higher than those of pMMR patients.