In the context of endometrial epithelial progenitor/stem cells, it will be important in future studies to determine if the other suggested epithelial progenitor cells expressing N-cadherin (Nguyen et al., 2017), or LGR5 (Tempest et al., 2018) play a role in the pathogenesis of endometriosis. This evidence concerns the gene LGR5 and endometriosis.