Abstract
Microsatellite instability (MSI) is a key feature in colorectal carcinomas (CRCs), but its role in diagnosis and prognosis, particularly through immunohistochemical markers like MSH6 and PMS2, remains underexplored. Conducted at Sree Balaji Medical College and Hospital, 50 histologically confirmed CRC samples were analyzed. Combined loss of MSH6 and PMS2 (MSI-H) was found in 30% of cases, particularly in poorly differentiated tumors, T3 stage tumors, stage II and III cancers, and node-positive groups. Thus, understanding of microsatellite instability (MSI) detection in colorectal carcinomas (CRCs) using immune histochemical markers MSH6 and PMS2, improving diagnostic and prognostic approaches for CRC.