Colorectal Cancer, Hereditary Nonpolyposis, Type 7, also known as hnpcc7, is related to mismatch repair cancer syndrome and lynch syndrome 1. An important gene associated with Colorectal Cancer, Hereditary Nonpolyposis, Type 7 is MLH3 (MutL Homolog 3). Affiliated tissues include colon and small intestine, and related phenotype is hereditary nonpolyposis colorectal carcinoma.