title: Letrozole in second-line therapy of advanced breast cancer: more questions than answers.
authors.forename: J R
authors.initials: JR
authors.lastname: Mackey
authors.forename: A A
authors.initials: AA
authors.lastname: Joy
mesh_terms: D000970:Antineoplastic Agents / Q000008:administration & dosage*; D047072:Aromatase Inhibitors; D001943:Breast Neoplasms / Q000188:drug therapy* / Q000473:pathology; D002170:Canada; D017326:Clinical Trials, Phase III as Topic; D004334:Drug Administration Schedule; D005060:Europe; D005260:Female; D006801:Humans; D000077289:Letrozole; D019290:Megestrol Acetate / Q000008:administration & dosage; D009362:Neoplasm Metastasis; D009570:Nitriles / Q000008:administration & dosage*; D010166:Palliative Care; D017698:Postmenopause; D016896:Treatment Outcome; D014230:Triazoles / Q000008:administration & dosage*
chemical_list: D000970:Antineoplastic Agents; D047072:Aromatase Inhibitors; D009570:Nitriles; D014230:Triazoles; D000077289:Letrozole; D019290:Megestrol Acetate