CD44 and neoplasm: Immunohistochemical staining of the tumour was reported to have confirmed the diagnosis of leiomyosarcoma of the prostate gland in that the tumour cells on immunohistochemistry expressed positive staining with smooth muscle actin (see Figure 2(a)), vimentin (see Figure 2(b)), and CD44, and the tumours on immunohistochemistry exhibited negative staining for S-100, cytokeratins, and CD117 (c-KIT).