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MMR expression in colorectal cancer before and after preoperative treatment. (A) Heatmap of MMR proteins expression scores pre- and post-treatment; (B) Representative cases of MMR expression conversion after preoperative treatment (↑ positive staining of normal cells, ↑ negative staining of tumor cells); (C) Comparison of MMR scores between pre- and post- treatment and the control group. *P < 0.05, ** P < 0.01, ***P < 0.001
