title: Phase II study of maytansine in advanced breast cancer.
mesh_terms: D000328:Adult; D000368:Aged; D001943:Breast Neoplasms / Q000188:drug therapy*; D004341:Drug Evaluation; D005260:Female; D006801:Humans; D008453:Maytansine / Q000009:adverse effects / Q000627:therapeutic use*; D008875:Middle Aged; D010078:Oxazines / Q000627:therapeutic use*
chemical_list: D010078:Oxazines; D008453:Maytansine