Has Mismatch Repair–Deficient Cancer Met Its MATCH?

Mismatch repair (MMR) deficiency (dMMR) was first described in the familial condition Lynch syndrome, which is a result of germline mutations in one of four MMR genes (MLH1, MSH2, MSH6, or PMS2) or, less commonly, deletions near the MSH2 gene on chromosome 2p21 at the epithelial cell adhesion molecule–locus (EpCAM).1-4 The loss of function in an MMR gene leads to hypermutation and high…

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