Fig. 2: Box plot of percentage of tumor cells expressing mismatch repair proteins by immunohistochemistry.

The percentage of tumor cells expressing (a) MLH1, (b) MSH2, (c) MSH6, and (d) PMS2 was in general lower for microsatellite instability-high cases with retained mismatch repair protein expression (right, green) in comparison to microsatellite stable cases (left, red).