CD31 (JC70)

CD31 is expressed by stem cells of the hematopoietic system and is primarily used to identify and concentrate these cells for experimental studies as well as for bone marrow transplantation. Endothelial cells also express this marker; therefore, antibodies to CD31 have been used as a tool to identify the vascular origin of neoplasms.1-3 Anti-CD31 has shown to be highly specific and sensitive for vascular endothelial cells.4 Staining of nonvascular tumors (excluding hematopoietic neoplasms) has not been observed.