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Case report timeline. Cell images were obtained using hematoxylin-eosin as the staining method and ×10 magnification. MSI-H/dMMR, microsatellite instability-high/deficient mismatch repair; AM, anal margin; XELOX, capecitabine 2,000 mg/m2 days 1 to 14 and oxaliplatin 130 mg/m2 day 1 every 21 days.
