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Expression of the human mismatch repair gene hMSH2

The human mismatch repair (MMR) gene hMSH2 (human mutS homolog‐2) is a DNA repair gene that has been reported to be mutated in 40% of hereditary nonpolyposis colon cancer (HNPCC) kindreds and a small percentage of sporadic tumors. HNPCC is a cancer predisposition syndrome with an increased risk of carcinoma of the colon, endometrium, stomach, small intestine, ovary, ureter, and renal pelvis. Immunohistochemical analysis demonstrated increased hMSH2 expression in sporadic colon carcinoma and in the replicative compartment of normal epithelium. A recent immunohistochemical analysis of hMSH2 in bladder tumors correlated reduced hMSH2 expression with recurrence and higher tumor grade. In the current study, we examined hMSH2 expression in urothelial malignancy using immunohistochemical analysis and developed a molecular assay for the detection of hMSH2 expression in bladder washes.