In the proliferative group, three proteins were more expressed in the plasma samples of controls compared to those of endometriosis patients: integrin beta 3 (ITB3), serine threonine-protein kinase receptor R3/activin receptor-like kinase 1 (ACVL-1/ALK-1), and integrin alpha-IIb (ITA2B) (Table 2). This evidence concerns the gene ACVRL1 and endometriosis.