Sentence: Carboplatin and paclitaxel versus cisplatin , paclitaxel and doxorubicin for first-line chemotherapy of advanced ovarian cancer : a Hellenic Cooperative Oncology Group ( HeCOG ) study .
Drug combination annotation:
[{'class': 'POS', 'spans': ['Carboplatin', 'paclitaxel'], 'is_context_needed': True}, {'class': 'POS', 'spans': [2, 3, 4], 'is_context_needed': True}]