SYP and neoplasm: On immunohistochemical examination, tumor cells were positive for vimentin, α1-antichymotrypsin, CD68, CD163, G-CSF, p53, and Ki-67, some tumor cells were positive for alpha SMA, HHF35, and calponin, but tumor cells were negative for EMA, CK AE1/AE3, CK CAM5.2, c-kit, CD34, DOG1, desmin, caldesmon, S-100 protein, synaptophysin, hCG, HMB45, myoglobin, and CD30.