MKI67 and neoplasm: Immunohistochemical staining of the tumor cells showed positive expression of caldesmon (Fig. 2C), cluster of differentiation (CD) 68 (Fig. 2D), Ki67 (Fig. 2E) and vimentin (Fig. 2F), but negative expression of α-fetoprotein (AFP), creatine kinase (CK), desmin, hepatocyte, muscle specific actin (MSA), myogenic differentiation (myod) 1, myoglobin and smooth muscle actin (SMA).