Sentence: No study has evaluated the significance of CD30 expression in DLBCL patients treated with rituximab , etoposide , prednisone , vincristine , cyclophosphamide , and doxorubicin ( R-EPOCH ) .
Drug combination annotation:
[{'class': 'COMB', 'spans': ['rituximab', 'etoposide', 'prednisone', 'vincristine', 'cyclophosphamide', 'doxorubicin'], 'is_context_needed': True}]