Hereditary colorectal cancer diagnostics: morphological features of familial colorectal cancer type X versus Lynch syndrome
Background The hereditary non-polyposis colorectal cancer (HNPCC) subset of tumours can broadly be divided into tumours caused by an underlying mismatch-repair gene mutation, referred to as Lynch syndrome, and those that develop in families with similar patterns of heredity but without disease-predisposing germline mismatch repair mutations, referred to as familial colorectal cancer type X (FCCTX)