There was no decidual-like reaction of the stromal cells in the FT wall except in two cases with localized endometriosis. Only very few submucosal stromal cells away from the implantation site were positive for uPAR. The tubal epithelium, circumferential muscular cells, and serosal mesothelium were uPAR negative. No maternal stromal zone of uPAR-positive cells directed against the implanting ectopic pregnancy. This evidence concerns the gene PLAUR and endometriosis.