title: Trial of tamoxifen at a dose of 40 mg daily after disease progression during tamoxifen therapy at a dose of 20 mg daily.
mesh_terms: D000368:Aged; D001943:Breast Neoplasms / Q000188:drug therapy*; D002986:Clinical Trials as Topic; D004334:Drug Administration Schedule; D005260:Female; D006801:Humans; D008875:Middle Aged; D011446:Prospective Studies; D013629:Tamoxifen / Q000008:administration & dosage*
chemical_list: D013629:Tamoxifen