Sentence: Combining erlotinib with doxorubicin or docetaxel or SN-38 resulted in additive or even synergistic antiproliferative effects .
Drug combination annotation:
[{'class': 'POS', 'spans': ['erlotinib', 'doxorubicin'], 'is_context_needed': False}, {'class': 'POS', 'spans': [0, 2], 'is_context_needed': False}, {'class': 'POS', 'spans': [0, 3], 'is_context_needed': False}]