TNF and endometriosis: The chronic inflammatory response of the ectopic endometrium exacerbates cell-mediated and humoral immune dysfunction in women with endometriosis, with higher levels of proinflammatory cytokines such as interleukin-1, -6, -8 and  -10, tumor necrosis factor-α, and vascular endothelial growth factor, in the peritoneal fluid of infertile women with endometriosis.