PECAM1 and pancreatic neoplasm: Circulating CD133+/Lin−/CD45−/CD34+ cells enriched for HSCs, CD105+/STRO-1+/CD45− cells enriched for MSCs, CD34+/KDR+/CD31+/CD45− cells enriched for EPCs and small CXCR4+CD34+CD133+ subsets of Lin−CD45− cells that correspond to VSELs were enumerated and sorted from blood samples derived from 29 patients with pancreatic cancer, and 19 healthy controls.