As previously detailed [5, 19, 21], our primary cell cultures were negative for markers of hematopoietic cells (CD45), tumor-associated macrophages (CD163), activated hepatic stellate cells (GFAP), endothelial cells (CD31), fibroblast-activation protein (FAP), and stromal-derived factor (SDF1). Here, PECAM1 is linked to neoplasm.