Figure 1. Immunohistochemical analyses of the biopsied colonic adenocarcinoma.
Biopsy of the cecal mass reveals sheet of cancerous cells (A, H&E stain). The cells show loss of nuclear immunoreactivity for MLH1 (B, immunostain) and PMS2 (C, immunostain) in the cancer. The overall features support a diagnosis of colonic adenocarcinoma with mismatch repair deficient.