In this case-control study, the IL-1α -889C>T, IL-1 receptor antagonist (IL-1RA) 86-bp microsatellite, IL-1 receptor 1 (IL-1R1) 52C>A, 294C>T, 1498T>C, 1632A>G, IL-1R2 rs2072472 C>T and rs7561460 C>T polymorphisms were analyzed in women with (n = 138) and without (n = 214) endometriosis using restriction fragment length polymorphism (RFLP) analysis, TaqMan assay, or DNA sequencing.