Sentence: However , when a lung mass was noted two months later , he started to receive combination chemotherapy consisting of cyclophosphamide , adriamycin , vincristine , and prednisolone every three months .
Drug combination annotation:
[{'class': 'COMB', 'spans': ['cyclophosphamide', 'vincristine', 'prednisolone', 'adriamycin'], 'is_context_needed': True}]