Sentence: Eighty-three patients were treated with rituximab , cyclophosphamide , doxorubicin , vincristine , prednisone ( R-CHOP ) , 7 with rituximab , etoposide , cyclophosphamide , doxorubicin , vincristine , prednisone ( R-EPOCH ) , and 6 with R-CHOP with methotrexate , 3 g/m(2 ) .
Drug combination annotation:
[{'class': 'NEG', 'spans': ['rituximab', 'cyclophosphamide', 'doxorubicin', 'vincristine', 'prednisone'], 'is_context_needed': True}, {'class': 'NEG', 'spans': [6, 7, 8, 9, 10, 11], 'is_context_needed': True}, {'class': 'NEG', 'spans': [12, 13], 'is_context_needed': True}]