Health / Medical Topics |
Lynch 1 Syndrome
A rare genetic neoplastic syndrome with an autosomal dominant pattern of inheritance but incomplete penetrance. It is associated with a greater than 70 % risk of developing colorectal carcinoma. It is caused by a mutation in one of the mismatch repair genes: MSH2, MLH1, MSH6 or PMS2. It usually manifests at age 50 or younger with multiple synchronous or metachronous colorectal carcinomas. Clinical course is rapidly progressive. Prognosis is variable with a high risk for the development of additional colorectal carcinomas. However, survival is significantly better than non-HNPCC carcinomas of equivalent stage. (NCI Thesaurus)
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