Finally, the lack of association found in women with bipolar disorder in this study may be due to limited statistical power, as only 49 (9.0%) of the cases within this subgroup had used prolactin-elevating antipsychotics for 1–4 years and 30 (5.5%) had used prolactin-elevating antipsychotics for ≥5 years. The gene discussed is PRL; the disease is bipolar disorder.