Immunohistochemistry analysis of diagnostic FFPE tumor samples were performed for MMR protein (MLH1, PMS2, MSH2, MSH6), ARID1A, and p53 expression status in 46 patients and PD-1, PD-L1, and PD-1/PD-L1 combined in 45 patients. The gene discussed is PMS2; the disease is neoplasm.