|Year : 2016 | Volume
| Issue : 5 | Page : 23-26
Clinical efficacy and safety of high-dose imatinib for chronic myeloid leukemia patients: An updated meta-analysis
Yonghua Liu1, Bingmu Fang1, Jinhong Jiang1, Peng Wang2
1 Department of Hematology, The 6th Affiliated Hospital of Wenzhou Medical University, Lishui 323000, Zhejiang Province, P.R. China
2 Department of Clinical Laboratory, The 6th Affiliated Hospital of Wenzhou Medical University, Lishui 323000, Zhejiang Province, P.R. China
|Date of Web Publication||7-Oct-2016|
Department of Clinical laboratory, The 6th Affiliated Hospital of Wenzhou Medical University, Lishui 323000, Zhejiang Province
Source of Support: None, Conflict of Interest: None
Objective: The aim of this study was to evaluate the clinical efficacy and safety of high-dose imatinib (IM) for chronic myeloid leukemia (CML) patients by pooled published studies.
Methods: Through searching the databases of PubMed, EMBASE, ASCO, ESMO, CNKI, and Wanfang, we collected open published clinical controlled trials-related high-dose IM treatment of CML. The pooled complete cytogenetic response (CCyR) and hematologic toxicities were calculated by the statistical software.
Results: Seven studies were included in this study with 1137 cases received high-dose IM treatment and 958 cases received regular-dose IM treatment. The pooled results showed that patients received high-dose IM had higher CCyR compared with regular-dose with the odds ratio (OR) of 1.75 (95% confidence interval [95% CI]: 1.44–2.1, P < 0.05) and 1.58 (95% CI: 1.38–1.81, P < 0.05) in 6 and 12 months. However, the hematologic toxicities risk of neutropenia (OR = 1.76, 95% CI: 1.22–2.54) and thrombopenia (OR = 1.88, 95% CI: 1.42–2.50) were much higher in the high-dose group.
Conclusion: High-dose IM for CML treatment was superior to standard-dose IM in the aspects of CCyR, but the risk of developing neutropenia and thrombopenia was much higher.
Keywords: Chronic myeloid leukemia, complete cytogenetic response, imatinib, meta-analysis
|How to cite this article:|
Liu Y, Fang B, Jiang J, Wang P. Clinical efficacy and safety of high-dose imatinib for chronic myeloid leukemia patients: An updated meta-analysis. J Can Res Ther 2016;12:23-6
|How to cite this URL:|
Liu Y, Fang B, Jiang J, Wang P. Clinical efficacy and safety of high-dose imatinib for chronic myeloid leukemia patients: An updated meta-analysis. J Can Res Ther [serial online] 2016 [cited 2018 May 22];12:23-6. Available from: http://www.cancerjournal.net/text.asp?2016/12/5/23/191623
| > Introduction|| |
Chronic myeloid leukemia (CML), also known as chronic granulocytic leukemia, is a malignant tumor of the white blood cells., CML was the first cancer to be linked to a clear genetic abnormality, the chromosomal translocation known as the Philadelphia chromosome. In this translocation, parts of two chromosomes (the 9th and 22nd) switch places. As a result, part of the “breakpoint cluster region” gene from chromosome 22 is fused with the ABL gene on chromosome 9. This abnormal “fusion” gene generates a protein of p210 or sometimes p185 weight with abnormal function.
Imatinib (IM) has been approved by the US Food and Drug Administration (FDA) as a first-line treatment for CML. The standard treatment dosage is 400 mg/day., However, several studies reported the high-dose IM can improve the complete cytogenetic response (CCyR) compared with standard dosage. However, for small cases included in each study, the statistical power is limited.
| > Methods|| |
Publication search strategy and inclusion criteria
Through searching the databases of PubMed, EMBASE, ASCO, ESMO, CNKI, and Wanfang, we collected open published clinical controlled trials-related high-dose IM treatment of CML. The searching terms were “CML” and “IM/Glivec” and no language restriction. The inclusion criteria were: (1) CML should be confirmed by cytology; (2) patients received high-dose or standard-dose IM; (3) without other types of malignant tumor history; (4) the CCyR can be extracted from the original studies.
Data extraction and quality assessment
Two reviewers (Yonghua Liu and Jinhong Jiang) extracted the data from the original included publications independently. The disagreement for data extraction was discussed and consulted to the third reviewer (Bingmu Fang) for consensus. The general information such as first and correspondence author name, the paper publication year, publication language, median age of included cases, and risk of prognosis distribution were extracted. Moreover, the number of CCyR was carefully extracted from each of the included study and cross-checked by the reviewers. The methodological qualities of the publications were evaluated according to the Cochrane Reviews Handbook 5.0 for the aspects of adequate sequence generation, blinding, incomplete outcome data address, free of selective reporting, and free of other biases.
Stata 11.0 (http://www.stata.com; Stata Corporation, College Station, TX, USA) and Review Manager (RevMan 5.0 provided by The Cochrane Collaboration, http://ims.cochrane.org/revman/download) were used to do the statistical analysis. Dichotomous data were calculated as the odds ratio (OR) with the 95% confidence interval (95% CI). Statistical heterogeneity across the included studies was assessed by Chi-square test, and the inconsistency was calculated by I2. If heterogeneity was existed (P < 0.05 or I2 > 50%), the random-effect method was used to pool the data otherwise, without significant heterogeneity, fixed-effect method was used.
| > Results|| |
General characteristics of included publications
According to the inclusion and exclusion criteria, several clinical trials were included in our meta-analysis. For the included seven studies, 1137 cases received high-dose IM treatment and 958 cases received regular-dose IM treatment. Six studies published in English and one study published in Chinese. Six trials provide the prognosis risk distribution. The general information is demonstrated in [Table 1].
Quality of included studies
The general methodological quality was assessed by a five-question instrument described in the Cochrane Reviews Handbook 5.0. In general, the methodological quality for the included studies was considered to be of moderate risk of bias. Three papers reported the adequate sequence generation, none of the seven studies reported the blinding, six papers reported the incomplete outcome address, six studies addressed free of selective reporting, and four papers addressed free of other biases. The general outcome of methodological quality for each study is shown in [Figure 1].
Complete cytogenetic response
Six and five studies reported the CCyR in the time of 6 and 12 months. No significant heterogeneity was found across the included studies; the pooled results indicated that patients received high-dose IM had higher CCyR compared with standard-dose with the OR of 1.75 (95% CI: 1.44–2.1, P < 0.05) and 1.58 (95% CI: 1.38–1.81, P < 0.05) in 6 and 12 months, respectively, by fixed-effects model [Figure 2]. Funnel plot was eudipleural for the evaluation of publications, which indicated no significant publication bias [Figure 3].
|Figure 2: The forest plot of complete cytogenetic response between high-dose imatinib and regular-dose imatinib|
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|Figure 3: The funnel plot of evaluation of publication bias for complete cytogenetic response|
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Five and four studies reported the neutropenia and thrombopenia toxicity, respectively. The data were pooled by fixed-effect model for lack of heterogeneity among the studies. The pooled data indicated that the hematologic toxicities risk of neutropenia (OR = 1.76, 95% CI: 1.22–2.54) and thrombopenia (OR = 1.88, 95% CI: 1.42–2.50) was much higher in the high-dose group compared to standard-dose group [Figure 4]. Moreover, the funnel plot indicated no statistical publication bias [Figure 5].
|Figure 4: The forest plot of hematologic toxicities between high-dose imatinib and regular-dose imatinib|
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|Figure 5: The funnel plot of evaluation of publication bias for hematologic toxicities|
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| > Discussion|| |
IM (marketed as Gleevec or Glivec), the first drug that was approved by the US FDA in 2001 for the treatment of CML. IM was found to inhibit the progression of CML in the majority of the CML patients sufficiently to achieve regrowth of their normal bone-marrow stem-cell population with stable proportions of maturing white blood cells. Because some leukemic cells persist in nearly all patients, the treatment has to be continued indefinitely. The standard dosage of IM for the treatment of CML was 400 mg/day. The prospective, randomized controlled trial (RCT) International Research InstituteS (IRIS) showed a promising results with 8-year follow-up for patients with CML in chronic phase (CP-CML) treated with 400 mg IM orally once daily (IM 400) with an 83% cumulative CCyR rate. With the promising results, IM 400 mg/day is considered an option for first-line treatment of CML by the National Comprehensive Cancer Network (http://www.nccn.org) and the European LeukemiaNet. Subsequently, several prospective RCTs reported the results of IM 400 mg/day for the treatment of CML. Deininger et al. reported a RCT of IM 800 mg daily induces deeper molecular responses than IM 400 mg daily: Results of SWOG S0325, an intergroup randomized Phase II trial in newly diagnosed CP-CML. They found that IM 800 could induce deeper molecular responses than IM 400, with a trend for improved progression-free and overall survival, but more severe toxicity also was found. However, Petzer et al. believed that standard-dose IM remains the standard of care for pretreated patients with CP-CML.
In our present meta-analysis, we included seven prospective clinical trials reported the clinical efficacy and safety of high-dose versus standard-dose IM for CML. The pooled results indicated that high-dose IM for CML treatment was superior to standard-dose IM in the aspects of CCyR, but the risk of developing neutropenia and thrombopenia was much higher. The pooled results were in accordance with most of the previously published studies.
However, an obvious limitation of this meta-analysis was existed. The methodology quality of included studies was not high with none of the seven publications reported the blinding. This limitation may affect the results stability of this meta-analysis.
Financial support and sponsorship
Project of science and Technology Department of Zhejiang Province(No.2012C33110);Project of Zhejiang Provincial Administration of traditional Chinese Medicine(No.2016ZQ036) ;Lishui Municipal Science and Technology Bureau(2014ZDXK04).
Conflicts of interest
There are no conflicts of interest.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5]