MedGen

Lynch syndrome is characterized by an increased risk for colorectal cancer (CRC) and cancers of the endometrium, ovary, stomach, small bowel, urinary tract, biliary tract, brain (usually glioblastoma), skin (sebaceous adenomas, sebaceous carcinomas, and keratoacanthomas), pancreas, and prostate. Cancer risks and age of onset vary depending on the associated gene. Several other cancer types have been reported to occur in individuals with Lynch syndrome (e.g., breast, sarcomas, adrenocortical carcinoma). However, the data are not sufficient to demonstrate that the risk of developing these cancers is increased in individuals with Lynch syndrome. [from GeneReviews]

Colorectal cancer-12 (CRCS12) is an autosomal dominant disorder characterized by a high-penetrance predisposition to the development of colorectal adenomas and carcinomas, with a variable tendency to develop multiple and large tumors. Onset usually occurs before age 40 years. The histologic features of the tumors may be unremarkable (Palles et al., 2013) or show microsatellite instability (MSI) (Elsayed et al., 2015). For a general phenotypic description and a discussion of genetic heterogeneity of colorectal cancer, see 114500. [from OMIM]

The hereditary mixed polyposis syndrome (HMPS) is characterized by atypical juvenile polyps, colonic adenomas, and colorectal carcinomas (CRC). Genetic Heterogeneity of Hereditary Mixed Polyposis HMPS2 (610069) is caused by mutation in the BMPR1A gene (601299) on chromosome 10q23. [from OMIM]