Case control study finds long-term pill use is associated with higher risk of benign liver tumors.
D000328:Adult; D003276:Contraceptives, Oral / Q000009:adverse effects*; D004341:Drug Evaluation; D004997:Ethinyl Estradiol / Q000009:adverse effects; D005260:Female; D006801:Humans; D008113:Liver Neoplasms / Q000139:chemically induced*; D008656:Mestranol / Q000009:adverse effects; D012306:Risk; D013997:Time Factors
D003276:Contraceptives, Oral; D004997:Ethinyl Estradiol; D008656:Mestranol