The concentration values of serum IL-1β determined in the study (mean values: 0.50 pg/mL for endometriosis, 0.50 pg/mL for non-endometriosis and 0.27 pg/mL for the control group) are on a similar level as the results obtained by Oku et al. [29] for endometriosis and control groups (mean values: 0.12 pg/mL and 0.17 pg/mL, respectively). The gene discussed is IL1B; the disease is endometriosis.