Publication Date:
2010-11-19
Description:
Abstract 2271 Introduction: Imatinib 400 mg/day represents the current standard treatment for de novo as well as pre-treated CML patients in chronic phase (CP). Recent randomized phase III trials revealed conflicting results concerning the potential higher efficacy of dose-increased imatinib in de novo treated CP-CML. Methods: We here present the final analyses including response data, OS, EFS and PFS of the multicenter, randomised, 2-arm phase III CELSG “ISTAHIT” trial evaluating imatinib high dose (HD) induction (800 mg/day, 6 months) followed by 400 mg/day as maintenance (experimental arm B) compared to continuous imatinib standard dose (400mg/day; arm A) in pre-treated CP CML patients. ClinicalTrials.gov Identifier: NCT0032726. Results: From a total of 243 patients screened for inclusion, 16 patients were not eligible (mainly due to non sufficient numbers of metaphases obtainable from the bone marrow before the start of the study). Of the remaining 227 patients, 113 patients were randomized into arm A and 114 patients into the experimental arm B. Subsequent data are presented as per protocol. No significant differences between treatment groups were observed regarding sex (55.5% female, 44.5% male), age (median: 46.3 years, range 18 –76), Sokal scores at diagnosis (30% low, 41% intermediate, 16% Sokal high risk, 13% unknown) and different pre-treatments, which included hydroxyurea (96%), interferon (72%), busulfan (17%) and “others” (26%; mainly Ara-C). The median observation time was 673 days. Cytogenetic responses were generally higher in the experimental arm B and revealed statistically significant differences in major cytogenetic responses (MCyR) at 3 and 6 months (month 3: 25.8% arm A, 48.3% arm B, p=0.002; month 6: 41.9% arm A, 58.8% arm B, p=0.029) as well as in complete cytogenetic responses (CCyR) not only during imatinib HD therapy (month 3: 7.5% arm A, 29.9% arm B, p
Print ISSN:
0006-4971
Electronic ISSN:
1528-0020
Topics:
Biology
,
Medicine
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