TNF and endometriosis: Potential immunomodulatory strategies targeting NK cells in endometriosis include glucocorticoids, intravenous immunoglobulins (IVIGs), intralipids [12], anti-TNFα medications (e.g., pentoxifylline and recombinant antagonists) [48], Bacillus of Calmette–Guerin (BCG) [49], lipiodol uterine infusion via hysterosalpingogram (HSG) [50], protopanaxadiol [51], NK cell infusion or modulation of NK cell receptors [49,52,53].