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- W2272000009 abstract "9541 Background: To investigate the clinical impact of the different types of disease progression (focal v extensive) in patients (pts) with metastatic gastrointestinal stromal tumors (GIST) after initial response to imatinib. Methods: Pts who received imatinib for metastatic GIST at three Cancer Centers and who have been followed up for at least 2.5 years were eligible for the study. Disease progression was classified as focal or extensive as defined by protocol. Responses were evaluated according to WHO criteria. Progression-free survival (PFS) and overall survival (OS) were calculated according to the Kaplan-Meier-method. In three pts with focal progressions, serial biopsies were obtained for mutation analysis. Results: Thirty-eight patients (21 men; mean age 58.4 years; range, 37–73 years) were included in the analysis. After a median follow-up of 31.8 mos, 25 of 38 (65.8%) patients had progressed. Nine of 25 progressions were classified as focal and 16 as extensive. Salvage therapies included dose escalation of imatinib with or without surgical resection. Median and 6- and 12-mos PFS were 11.3 mos, 89%, and 40% in pts with focal progression, and 2.5 mos, 39%, and 32%, in patients with extensive progression, respectively. The median OS was 22.8 mos in pts with extensive progression, and was not reached in pts with focal progression. Two subsequent focal progressions in one pt were associated with 2 different secondary KIT-mutations, whereas non-progressive disease harbored the original KIT-mutation alone. Conclusions: Imatinib resistance seems to be partial in a subset of progressing GIST pts. These pts may benefit from local treatment and imatinib continuation and further investigation of imatinib combinations with other compounds appears warranted. Extensive progression is associated with a dismal survival. No significant financial relationships to disclose." @default.
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- W2272000009 date "2006-06-20" @default.
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- W2272000009 title "Pattern of progression and its impact on outcome in patients with gastrointestinal stromal tumors after initial response to imatinib mesylate: A retrospective multicenter long-term follow-up study" @default.
- W2272000009 doi "https://doi.org/10.1200/jco.2006.24.18_suppl.9541" @default.
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