Sentence: The study was conducted in 90 patients operated on for unilateral breast cancer who were then assigned to receive either 12 intravenous cycles of cyclophosphamide , methotrexate and fluorouracil ( CMF ) every three weeks , or no further treatment .
Drug combination annotation:
[{'class': 'POS', 'spans': ['cyclophosphamide', 'methotrexate', 'fluorouracil'], 'is_context_needed': True}]