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GIST-T1 and GIST-T1 IR cells. (A) GIST-T1 cell density was adjusted to 5, 000 cells/100 µl, and the cells were cultured in 2.5, 10, 15, 20, 25, 30, 40 and 50 µM IM. (B) GIST-TI IR cell medium contained 5, 25, 30, 35, 40, 50, 62.5 and 75 µM IM, and the cells were cultured at the same cell density. GIST, gastrointestinal stromal tumour; IM, imatinib mesylate; IR, IM-resistant.
