EPCAM and endometriosis: The validated cmHsp70.1 mAb- and EpCAM mAb-based bead approaches for isolating circulating tumor cells (CTCs) from EDTA anti-coagulated blood from patients with different tumor entities [16] was used to isolate circulating endometriotic cells (CECs) from patients with histologically confirmed endometriosis (n = 12) and patients with (n = 5) and without extra-uterine endometriosis (n = 7); as a negative control, the EDTA blood of two healthy donors (n = 2) was used in the testing of the isolation approaches.