Abstract
Purpose
To evaluate the efficacy and safety of 2-year adjuvant imatinib for patients at high risk of recurrence after complete resection of localized gastrointestinal stromal tumor with KIT exon 11 mutation.
Methods
Imatinib 400 mg/d was administered until disease recurrence, intolerable toxicities, or for 2 years. The primary end point was recurrence-free survival.
Results
Patients (n = 47) from 4 centers in Korea were enrolled. Treatment was well tolerated. Grade 3–4 toxicities included neutropenia (27.7 %), skin rash (8.5 %), anorexia (4.3 %), and constipation (2.1 %). At a median follow-up of 56.7 months, 19 patients had recurrences. Median recurrence-free survival was 58.9 months, which was significantly longer than 22.7 months from historical data of 27 patients in the pre-imatinib era (P < 0.0001). Imatinib was rechallenged for 15 patients with recurrence after completion of adjuvant imatinib. Thirteen patients had partial response, and two had stable disease. There was only one death so far.
Conclusions
Postoperative adjuvant imatinib for 2 years was safe and could prolong the recurrence-free survival in patients with a high risk of recurrence after complete resection of localized KIT exon 11 mutated gastrointestinal stromal tumor. Reintroduction of imatinib after recurrence appears to be effective if the recurrence develops after completion of adjuvant imatinib.
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Acknowledgments
We thank Novartis Korea Ltd. (Seoul, Korea), which provided imatinib mesylate and partial funding for this study. All authors reviewed and approved the paper. Financial support for medical editorial assistance was provided by Novartis Pharmaceuticals. We thank Jinling Wu, MD, PhD, for her medical editorial assistance with this manuscript.
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Kang, YK., Kang, B.W., Im, SA. et al. Two-year adjuvant imatinib mesylate after complete resection of localized, high-risk GIST with KIT exon 11 mutation. Cancer Chemother Pharmacol 71, 43–51 (2013). https://doi.org/10.1007/s00280-012-1970-3
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DOI: https://doi.org/10.1007/s00280-012-1970-3