
GastroenterologyDNA mismatch repairMLH3
Germline MSH3 and MLH3 Mutations as Tumor Suppressors Elevating Colorectal Cancer Risk via Hypermutation Signature ID4
By MedXY|Sep 15, 2026
Heterozygous germline mutations in MSH3 and likely MLH3 confer an increased colorectal cancer risk through somatic second hits, inducing hypermutant, microsatellite-stable tumors characterized by signature ID4 and excess somatic deletions.