Sentence: Furthermore , VPA significantly increased chemosensitivity to fludarabine , flavopiridol , bortezomib , thalidomide and lenalidomide .
Drug combination annotation:
[{'class': 'POS', 'spans': ['VPA', 'fludarabine'], 'is_context_needed': False}, {'class': 'POS', 'spans': [0, 2], 'is_context_needed': False}, {'class': 'POS', 'spans': [0, 3], 'is_context_needed': False}]