Sentence: Patients with clinically localized , intermediate- or high-grade non-Hodgkin 's lymphoma usually receive initial treatment with a doxorubicin-containing regimen such as cyclophosphamide , doxorubicin , vincristine , and prednisone ( CHOP ) .
Drug combination annotation:
[{'class': 'POS', 'spans': ['cyclophosphamide', 'doxorubicin', 'vincristine', 'prednisone'], 'is_context_needed': False}]