Sentence: The authors report the case of a 4-year-old boy with a diagnosis of stage IV neuroblastoma ( NB ) , who had been treated with 6 cycles of cyclophosphamide , doxorubicin , cisplatin , and etoposide for 12 months .
Drug combination annotation:
[{'class': 'COMB', 'spans': ['cyclophosphamide', 'doxorubicin', 'cisplatin', 'etoposide'], 'is_context_needed': True}]