In a study of 35 cases (15 infertile patients with endometriosis, 10 infertile patients with nonendometriotic ovarian cysts, and 10 healthy fertile women), the mean expression of NF-κB1 was remarkably higher in the ectopic endometrium of infertile patients with endometriosis than in the endometria of patients with nonendometriotic cysts and fertile patients 89. The gene discussed is NFKB1; the disease is endometriosis.