Paired eutopic (E-Eutopic) and ectopic endometrial MSCs (passage 5) derived from patients with endometriosis and eutopic (C-Eutopic) endometrial MSCs (passage 5) derived from patients without endometriosis were identified for the expression of positive MSC markers CD44, CD73, CD90 and CD105, and negative MSC markers CD34 and CD45. This evidence concerns the gene CD34 and endometriosis.