Results of a randomised trial in this week’s issue of THE LANCET suggest that a single daily 400 mg dose of imatinib—known to be a first-choice treatment for gastro-intestinal stromal tumours (GIST)—is sufficient to induce a therapeutic response; a doubling of a daily dose can slightly improve progression-free survival for patients.
Imatinib is approved worldwide for use in GIST, tumours which do not respond to conventional chemotherapy, which have a prevalence of around 20 per 100,000 population. Jaap Verweij (Erasmus University Medical Center, Netherlands) and colleagues from the European Organisation for Research and Treatment of Cancer (EORTC), the Italian Sarcoma Group (IRG), and the australasian Gastrointestinal Trials Group (AGITG) studied 946 patients with metastatic GIST who were randomly allocated either imatinib 400 mg once or twice a day.
50% of patients receiving two doses of imatinib a day, compared with 56% of patients given a single dose, were alive and free of disease progression at around 2 years follow-up. There was no difference in the proportion of patients (99%) who reported treatment side-effects; the optimum time for therapeutic effect after the start of treatment did not differ between the two groups (around 4 months).
Richard Lane | alfa
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