Table 2.

Different types of EPC (EPC can be subdivided into early and late EPC).

	Early EPC		Late EPC
Types of endothelial progenitor cells	Colony forming unit-Hill (CFU-Hill)	Circulating angiogenic cells (CAC)	Endothelial colony forming cells (ECFC)
Markers	CD34+, CD31+, CD45+, KDR+	CD34+, CD31+, CD45+, KDR+	CD34+, CD31+, CD45-, KDR+, CD144+, vWf+
Origin	Hematopoietic cells	Hematopoietic cells	Endothelial cell
Properties	Do not proliferate but express paracrine factors	Participate to angiogenesis through secretion of paracrine factors. Do not incorporate into vasculature and do not differentiate into endothelial cells	Participate to angiogenesis through differentiation into mature endothelial cells and incorporation into new vessels