Interestingly, the overexpression of proinflammatory cytokines (IL-1β, TNF-α, IL-8), as well as the TNF-stimulated gene-6 factor (TSG-6), in the endometrium of patients with endometriosis was confirmed in a small cohort study conducted by Matteo et al. [35]. The gene discussed is CXCL8; the disease is endometriosis.