Sentence: Phase Ib Study of the Oral Proteasome Inhibitor Ixazomib ( MLN9708 ) and Fulvestrant in Advanced ER+ Breast Cancer Progressing on Fulvestrant .
Drug combination annotation:
[{'class': 'POS', 'spans': ['Ixazomib', 'Fulvestrant'], 'is_context_needed': True}]