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The aim of this study was to investigate the associations between secondary mutations of c-KIT/PDGFRα and acquired imatinib resistance or efficacy of sunitinib in Chinese patients with gastrointestinal stromal tumors (GISTs). Mutations of c-KIT (exons 9, 11, 13, 14, 17, and 18) and PDGFRα (exons 12 and 18) in tumor samples of 50 patients were analyzed by direct sequencing. A total of 50 samples before...
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