MLH1 methylated cases consisted predominantly of endometrioid tumors (323/404, 80.0%), followed by high-grade ECs (16/404, 4.0%), mixed histology ECs (11/404, 2.7%), dedifferentiated/undifferentiated carcinomas (7/404, 1.7%), carcinosarcomas (6/404, 1.5%), mucinous (3/404, 0.7%) and clear cell (2/404, 0.5%). Here, MLH1 is linked to undifferentiated carcinoma.