Mutation frequencies were similar between the groups, except for mutations in KRAS, which were less frequent in PSC–IBD–CRC (5%) versus IBD–CRC (38%) and sCRC (31%; p = 0.034) and in APC which were less frequent in PSC–IBD–CRC (5%) and IBD–CRC (0%) versus sCRC (50%; p < 0.001). The gene discussed is KRAS; the disease is inflammatory bowel disease.