Sentence: Fifty-seven patients with advanced measurable urothelial tract cancer , 52 of whom had an adequate trial , were treated weekly with 3 to 4 mg . per m.2 vinblastine and 30 to 40 mg . per m.2 methotrexate .
Drug combination annotation:
[{'class': 'POS', 'spans': ['vinblastine', 'methotrexate'], 'is_context_needed': True}]