CD31分子
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	CD31 分子  
	CD31
	常用单克隆抗体或代号: SG134,TM3,HEC- 75;(PECAM、EndoCAM)
	主要表达细胞: Pt,M,G,B,NK,Tsub [AS]
	分子质量(kDa)和结构: gp140,血小板GPⅡa(IgSF)
	功    能: 嗜同性或嗜异性(与CD38互为受体)粘附,炎症,En功能 
		CD31
	
		Aka platelet endothelial cell adhesion molecule, PECAM-1 
	
		Encoded on #17
	
		Most sensitive and specific endothelial marker in paraffin sections
	
		Important role in diapedesis step of leukocyte emigration in inflammation; also angiogenesis
	
		Note: don’t confuse CD31+ macrophages (granular, membranous expression) with a vascular tumor, AJSP 2001;25:1167
	
		Sensitive for malignant vascular tumors; may be less sensitive for benign lesions
	
		Interpretation: membranous stain (not cylasmic); endothelium is a positive internal control
	
		Positive staining (normal): endothelium, platelets, macrophages and Kupffer cells, granulocytes, T / NK cells, lymphocytes, megakaryocytes, fibroblasts, osteoclasts, neutrophils
	
		Positive staining (tumors): epithelioid hemangioendothelioma; epithelioid sarcoma-like hemangioendothelioma (AJSP 2003;27:48); other vascular tumors, histiocytic malignancies, plasmacytomas; rare carcinomas and sarcomas
	
		Micro images: epithelioid angiosarcoma (figure 1A)
	
		Micro images (AJSP subscribers): epithelioid sarcoma-like hemangioendothelioma, epithelioid hemangioendothelioma, epithelioid angiosarcoma, CD31+ macrophages, malignant histiocytosis
	
		Micro images (Hum Path subscribers): hepatic cavernous hemangiomas (figure 2B) 
	
		Micro images (Mod Path subscribers): angiosarcoma (figure E)
	
		References:  AJSP 2001;25:684, Mod Path 2002:15;434








