Sentence: A 29-year-old white man with recurrent Hodgkin 's disease received doxorubicin , bleomycin , vinblastine , and dacarbazine ( ABVD ) chemotherapy once every two weeks for 12 cycles .
Drug combination annotation:
[{'class': 'COMB', 'spans': ['doxorubicin', 'bleomycin', 'vinblastine', 'dacarbazine'], 'is_context_needed': True}]