MKI67 and neoplasm: Microscopic examination revealed: The tumor tissue was arranged irregularly, with significant atypia and pleomorphism of the tumor cells, presence of bizarre tumor giant cells and multinucleated tumor cells, interspersed with varying numbers of spindle-shaped cells, and chronic inflammatory cell infiltration in the stroma (Figure 3A); Immunohistochemical staining showed: Vimentin (+, Figure 3B), CD10 (+, Figure 3C), CD68 (+), Ki-67 (approximately 30%, Figure 3D).