MKI67 and soft tissue sarcoma: Meanwhile, it was negative for SMA, CK, S-100, and desmin.[3,9,15] However, the diagnostic immunostaining pattern has not been determined.[2] Ki-67 is used to evaluate tumor cell proliferation.[16] The mean Ki-67 percentage of soft tissue sarcoma is 20%–25%.[17,18] Based on previous reports, the Ki-67 positivity rate of malignant GCST reached up to 20-30%.[9,19] In the current case, the tumor was positive for CD68, and this finding was consistent with the previous reports.