Sentence: Patients treated on CCG-3881 ( n = 116 ) received four-drug chemotherapy for 9 months ( cisplatin , cyclophosphamide , doxorubicin , and etoposide ) , with surgery and local radiation to residual disease .
Drug combination annotation:
[{'class': 'POS', 'spans': ['cisplatin', 'cyclophosphamide', 'doxorubicin', 'etoposide'], 'is_context_needed': True}]