Sentence: Treatment of GIST882-R with imatinib in combination with gefitinib , an EGFR inhibitor , partially prevented cell growth , implying that EGFR may be involved in acquisition of secondary imatinib resistance in GIST .
Drug combination annotation:
[{'class': 'POS', 'spans': ['imatinib', 'gefitinib'], 'is_context_needed': False}]