CD274 and neoplasm: The immunohistochemistry results were as follows: CK(widespread+), CD56(+), CK8/18(+), CD117(partial weak+), CgA(−), Syn(−), TTF-1(−), PD-1(−), PD-L1:(tumor cells, 90%+; immune cells, 20%+), MLH1(+), MSH2(+), MSH6(+), PMS2(+), Ki-67: 80%.