BCL6 and endometriosis: Previous studies demonstrated that endometrial B-cell lymphoma-6 (BCL6) protein levels are significantly higher in patients with RPL, unexplained infertility or endometriosis (eutopic endometrium) when compared with controls (Evans-Hoeker et al., 2016; Almquist et al., 2017; Fox et al., 2020; Sansone et al., 2021).