Sentence: Sorafenib monotherapy and combinations with taxanes , bevacizumab and ixabepilone showed inadequate efficacy , while efficacy results from combinations with gemcitabine and/or capecitabine and possibly tamoxifen were more promising .
Drug combination annotation:
[{'class': 'POS', 'spans': ['Sorafenib', 'gemcitabine'], 'is_context_needed': False}, {'class': 'POS', 'spans': [0, 4], 'is_context_needed': False}, {'class': 'POS', 'spans': [0, 5], 'is_context_needed': False}, {'class': 'COMB', 'spans': [0, 1], 'is_context_needed': True}, {'class': 'COMB', 'spans': [0, 2], 'is_context_needed': True}]