Sentence: Three interventions exhibited significantly improved OS results over chemotherapy ( all HR < 1 ): Ipilimumab , Nivolumab and Ipilimumab + Chemotherapy .
Drug combination annotation:
[{'class': 'POS', 'spans': ['Ipilimumab', 'Nivolumab', 'Ipilimumab', 'Chemotherapy'], 'is_context_needed': False}]