JOURNAL ARTICLE
MULTICENTER STUDY
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A multicenter long-term study of imatinib treatment for Japanese patients with unresectable or recurrent gastrointestinal stromal tumors.

BACKGROUND AND OBJECTIVES: This multicenter study, which was conducted in northern Kanto, Japan, aimed to assess the efficacy of imatinib mesylate against advanced or recurrent gastrointestinal stromal tumors (GIST).

METHODS: The clinicopathological data of 234 GIST patients who were treated at one of the 11 participating hospitals from 2001-2011 were retrospectively reviewed. Imatinib was administered as a first-line therapy in cases involving unresectable disease or postoperative recurrence (41 cases). The median follow-up period was 4.0 years.

RESULTS: After a median follow-up period of 4.0 years, the patients treated with imatinib (n = 41) exhibited 1-, 3-, and 5-year overall survival (OS) rates of 92.3%, 74.9%, and 53.8%, respectively. In univariate and multivariate analyses, imatinib dose reduction and achieving a complete or partial response were found to be associated with increased OS.

CONCLUSIONS: Long-term imatinib treatment is recommended for patients with non-progressive disease. If patients experience significant toxicities, temporary dose reduction might be useful.

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