CD34 and neoplasm: Immunohistochemical staining results show that tumor cells usually express vimentin, CD34, and PR, and to varying degrees express SMA and desmin.[11] In terms of histomorphology of prostatic synovial sarcoma, the tumor cells can present as spindle-shaped, arranged in fascicles, or epithelioid, forming tubular or trabecular structures, with frequent mitotic figures.