title: Long-term pill use appears to increase risk of rare benign liver tumors; announce study to find incidence.
mesh_terms: D003276:Contraceptives, Oral / Q000009:adverse effects*; D005260:Female; D006801:Humans; D008113:Liver Neoplasms / Q000139:chemically induced*; D013997:Time Factors; D014481:United States
chemical_list: D003276:Contraceptives, Oral