Sentence: The EVA regimen ( etoposide , vinblastine , doxorubicin ) is an attempt to substitute a known active agent , etoposide , for bleomycin and dacarbazine .
Drug combination annotation:
[{'class': 'POS', 'spans': ['etoposide', 'vinblastine', 'doxorubicin'], 'is_context_needed': True}, {'class': 'COMB', 'spans': [1, 2, 4, 5], 'is_context_needed': True}]