MSH2 and cancer: The analysis of correlation between MSH2 expression and TMB and MSI in 33 common cancers reflected that the expression of MSH2 in ACC, BLCA, BRCA, HNSC, LGG, LUAD, LUSC, MESO, OV, PRAD, READ, SKCM, STAD, and UCEC was significantly positively correlated with TMB.