Primary gastrointestinal stromal tumor of the liver treated with sequential therapy

Figure 2 Microscopic and immunohistochemical findings of the resected specimen obtained in August 2009. A: Microscopically, the tumor was composed of spindle cells and epithelioid cells with high mitotic activity (8/50 HPF) (hematoxylin-eosin, original magnification × 400); B, C: Immunohistochemical staining with antibodies against CD117 (B) and CD34 (C) showed diffuse cytoplasmic staining of almost all tumor cells when compared with the lack of staining in adjacent liver tissue (original magnification × 400).