title: Long-term tamoxifen therapy: can an antagonist become an agonist?
authors.forename: R J
authors.initials: RJ
authors.lastname: Santen
mesh_terms: D001943:Breast Neoplasms / Q000188:drug therapy; D004965:Estrogen Antagonists / Q000494:pharmacology*; D004967:Estrogens / Q000819:agonists*; D005260:Female; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D013629:Tamoxifen / Q000627:therapeutic use*; D013997:Time Factors
chemical_list: D004965:Estrogen Antagonists; D004967:Estrogens; D013629:Tamoxifen