Challenges in the Identification of MSH6-Associated Colorectal Cancer: Rectal Location, Less Typical Histology, and a Subset With Retained Mismatch Repair Function.
Identification of Lynch syndrome tumors is challenging. This relates particularly to MSH6-associated cases, which show reduced penetrance of colorectal cancer and a higher age at diagnosis. We recorded the clinical and morphologic features of 52 MSH6-associated colorectal cancers in comparison with MLH1/MSH2-mutant tumors and sporadic mismatch repair-deficient cancers. In the MSH6 subset, we confi