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Yamaguchi, M., Matsumoto, T., Tate, G. et al. Secondary resistance to imatinib mesylate in a patient with unresectable duodenal GIST without mutations in exons 9, 11, 13, or 17 of the c-kit protooncogene. J Gastroenterol 39, 904–905 (2004). https://doi.org/10.1007/s00535-003-1409-z
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DOI: https://doi.org/10.1007/s00535-003-1409-z