In the menstrual phase, the peritoneal fluid of patients with endometriosis had higher levels of miR-106b-3p, miR-130a-3p, miR-150-5p, miR-185-5p, miR-451a, miR-486-5p, VEGF-A, IL-8, macrophage inflammatory protein 1β (MIP 1β), uPA, and plasminogen activator inhibitor-1 (PAI-1) compared to the proliferative and secretory phases. This evidence concerns the gene CXCL8 and endometriosis.