CD34 and neoplasm: The diagnosis of malignancy depends on the occurrence of metastases, which is rare and can have a latency of many years.[11] Considering the concept that induction of angiogenesis is necessary for tumor growth and metastases, and because PCCs are highly vascularized tumors, we analyzed the vascular pattern of 184 PCC/PGL, immunohistochemically stained with anti-CD34 antibody.