POLD1 and hereditary cancer: Using a commercial Hereditary Cancer Risk Test on 12/31/16, no mutations were identified in 31 DNA homologous or mismatch repair genes, including BRCA1/2, ATM, POLD1/POLE, RAD51D, TP53, NBN, PALB2, PMS2, MLH1, MSH2, MSH6, MYTYH, and EpCAM. In addition, immunohistochemistry analysis of his prostate biopsy did not reveal loss of MLH1, MSH2, MSH6, or PMS2, and his tumor was found to be microsatellite stable.