title: Letter: Liver tumours and steroid hormones.
mesh_terms: D000818:Animals; D006528:Carcinoma, Hepatocellular / Q000139:chemically induced*; D003276:Contraceptives, Oral / Q000009:adverse effects* / Q000494:pharmacology; D004958:Estradiol / Q000009:adverse effects; D005260:Female; D006801:Humans; D008099:Liver / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D008113:Liver Neoplasms / Q000139:chemically induced*; D008297:Male; D009641:Norethynodrel / Q000009:adverse effects; D051381:Rats
chemical_list: D003276:Contraceptives, Oral; D004958:Estradiol; D009641:Norethynodrel