scholarly journals Which One, Generic Vs Original Glivec Is More Effective in Patients with Chronic Myeloid Leukemia?

Blood ◽  
2019 ◽  
Vol 134 (Supplement_1) ◽  
pp. 4156-4156
Author(s):  
Ekin Kircali ◽  
Guldane Cengiz Seval ◽  
Sinem Civriz Bozdag ◽  
Selami Kocak Toprak ◽  
Meltem Kurt Yuksel ◽  
...  
Keyword(s):  
Treatment Failure ◽  
Research Funding ◽  
Chronic Phase ◽  
Response Rates ◽  
Molecular Response ◽  
Optimal Response ◽  
Generic Group ◽  
Significant Difference ◽  
Generic Groups ◽  
Support Research

Introduction:Generic imatinib formulations are increasingly being used as more affordable alternatives worldwide and a few studies have evaluated the safety and efficacy of these formulations prospectively. We have retrospectively analyzed our CML cohort in terms of first line treatment of Glivec versus generic imatinib. This study aims to evaluate the safety and efficacy of generic imatinib products in chronic phase chronic myeloid leukemia as first line treatment. Methods:We have retrospectively analyzed our CML cohort from January 2000 to December 2018 treated with either Glivec or one of generic imatinib formulations. All of our patients (with 1 exception) were initiated imatinib in chronic phase in less than 56 days from diagnosis. All of our patients were followed in accordance with European Leukemia Net (ELN) 2013 recommendations and national hematology association CML guidelines and response definitions were applied according to ELN 2013 criteria. Event free survival (EFS) was defined as the time between treatment initiation and either loss of hematological response, progression to accelerated phase (AP) or blastic phase (BP), or death from any cause. Progression free survival was defined as the time between treatment initiation and transformation to AP, BP or death while on imatinib. For statistical analyses SPSS version 21.0 was used. All p values < 0.05 were considered statistically significant. Results:A total of 192 patients were analyzed comparing 102 (53.1 %) patients on Glivec with 90 patients on (476.9 %) generic formulations. 99 (51.6 %) were female patients. The median age of our population was median 46 years (14-88 years) for Glivec and median 51 years (19-79 years) for generic group (p=0.01). Risk stratifications according to Sokal, Hasford and ELTS scores were run for both Glivec and generic formulation groups. Most of the patients had low risk according to Sokal (137, 71.4%) and Hasford (116, 60.4 %) but intermediate risk according to ELTS (113, 58.9 %) scoring systems. There was no statistically significant difference in the gender distribution, Sokal, Hasford, ELTS scores and ECOG between the two groups. The median time to initiate imatinib treatment was 23.5 (1- 156) days for Glivec group and 13 (1- 51) days generic group (p< 0.05). But the late onset of the treatment was not associated with treatment failure or death. The median follow up was 119.8 (3.7- 250.5) months for Glivec group and 43.6 (2- 150) months for generic groups, respectively (p< 0.05). This difference might be explained by the fact that Glivec has been on the market for about two decades. Similar rates of grade> 2 hematological and non- hematological toxicity were seen in Glivec (4.9 %) and generic groups (3.3 %), respectively (p> 0.05). The rates of treatment failure at 3 months were significantly higher in generic formulation (6.7 %) group than Glivec (2.9 %) group (p< 0.05). Also, the rates of treatment failure at 6 months were significantly higher in generic formulation (3.3 %) group than Glivec (0.9 %) group (p< 0.05). Optimal molecular response rate at 3 months was 76.5 % (n=78) for Glivec and 32.2 % (n=29) for generic groups (p< 0.001). Also, optimal molecular response rate at 6 months was 69.6 % (n=71) for Glivec and 45.6 % (n=41) for generic groups (p= 0.01). Median EFS was found significantly higher for Glivec group compared to generic group (168 mos (95% CI: 159-177 mos) vs 74.6 mos (95% CI: 56-93); p<0.001) (Figure). Conclusion: We found that complete hematological response rates at 3 and 6 months were similar in both groups, but in early phase of treatment the optimal response rates of Glivec group was statistical significantly higher than generic group. Generic group presented with a lower rate of optimal response at 3 months but 13.4 % improvement in optimal response rates was observed at six months. No significant difference in safety concerns was observed between the groups. We recommend that these results from single center should be clarified in a prospective, randomized study including larger population. Figure Disclosures Özcan: AbbVie: Other: Travel support, Research Funding; MSD: Research Funding; Novartis: Research Funding; Amgen: Honoraria, Other: Travel support; BMS: Other: Travel support; Jazz: Other: Travel support; Sanofi: Other: Travel support; Abdi Ibrahim: Other: Travel support; Janssen: Other: Travel support, Research Funding; Bayer: Research Funding; Celgene Corporation: Research Funding, Travel support; Takeda: Honoraria, Other: Travel support, Research Funding; Archigen: Research Funding; Roche: Other: Travel support, Research Funding. Beksac:Celgene: Speakers Bureau; Janssen: Research Funding, Speakers Bureau; Amgen: Membership on an entity's Board of Directors or advisory committees, Speakers Bureau; Takeda: Membership on an entity's Board of Directors or advisory committees, Speakers Bureau.

scholarly journals Discontinuation of Dasatinib after Deep Molecular Response for over 2 Years in Patients with Chronic Myelogenous Leukemia and the Unique Profiles of Lymphocyte Subsets for Successful Discontinuation: A Prospective, Multicenter Japanese Trial (D-STOP Trial)

Blood ◽  
2016 ◽  
Vol 128 (22) ◽  
pp. 791-791 ◽  
Author(s):  
Takashi Kumagai ◽  
Chiaki Nakaseko ◽  
Kaichi Nishiwaki ◽  
Chikashi Yoshida ◽  
Kazuteru Ohashi ◽  
...  
Keyword(s):  
Research Funding ◽  
Lymphocyte Subsets ◽  
Chronic Phase ◽  
Myelogenous Leukemia ◽  
Molecular Response ◽  
Consolidation Therapy ◽  
Cd8 Cells ◽  
Stop Trial ◽  
Significant Difference ◽  
Group B

Abstract Introduction The tyrosine kinase inhibitor (TKI), imatinib, dramatically improves the prognosis of chronic myelogenous leukemia (CML) by suppressing the function of BCR-ABL gene. It was shown that imatinib could be discontinued in a proportion of patients with CML who maintained deep molecular response (DMR) for at least 2 years. (Lancet Oncol. 2010; 11:p1029) Treatment with second generation TKI, dasatinib, after imatinib resistance/intolerance could also be discontinued after maintaining DMR for over 1 year in a proportion of patients with CML (Lancet Haematol. 2015; 2:p528). In this Japanese prospective multicenter trial (D-STOP trial by Shimousa Hematology and Kanto CML Study Groups, ClinicalTrials.gov Identifier: NCT01627132), we aimed to discontinue dasatinib in patients with CML who maintained DMR for over 2 years. Methods: Chronic phase CML patients treated with TKIs who had undetectable BCR-ABL1 mRNA were enrolled. After confirmation of undetectable BCR-ABL1 mRNA (International Scale <0.01%) using real-time quantitative polymerase chain reaction (RQ-PCR) in the central laboratory, the patient received additional dasatinib treatment for another 2 years as consolidation therapy. Patients who maintained DMR during the consolidation therapy proceeded to discontinue dasatinib. BCR-ABL1 mRNA was monitored every month in year 1 and every 3 months in year 2. Molecular relapse was defined as two successive positive RQ-PCRs for BCR-ABL1 within 1 month. The relapsed patients restarted dasatinib. The primary endpoint was treatment-free survival after 12 months of discontinuation. Lymphocyte subsets were analyzed using flow cytometry during and after the consolidation therapy. Results: Sixty-five patients received consolidation therapy, and 54 discontinued dasatinib treatment after maintenance of DMR for 2 years. Mean age of the patients was 54.2 (25-82) years, and median follow-up period after cessation of dasatinib was 16.2 (7-30) months. Twenty patients relapsed during the observation period. Using Kaplan-Meier analysis, the estimated overall treatment-free survival (TFS) was 62.9% (48.5-74.2) at 12 months (Fig.1). Most relapses occurred within 6 months after discontinuation of dasatinib. All relapsed patients responded again to dasatinib. There was no significant difference either in estimated TFS between males and females or Sokal scores at diagnosis. During the consolidation therapy, the proportion (%) of CD4+CD8−, CD3−CD56+, CD16+CD56+, and CD57+CD56+ cells among total lymphocytes were monitored using flow cytometry in patients who could discontinue dasatinib during the observation periods (group A) and those who relapsed (group B). At the start of the consolidation therapy, there was no significant difference between groups A and B (CD4+CD8−%: 33.6 vs 34.0, p = 0.89, CD3−CD56+%: 24.3 vs 24.1, p = 0.95; CD16+CD56+%: 22.1 vs 23.9, p = 0.57; CD57+CD56+%: 19.7 vs 21.8, p = 0.51, respectively). In group B, the proportion of CD4+CD8− cells gradually decreased, whereas CD3−CD56+, CD16+CD56+, and CD57+CD56+ cells gradually increased during the consolidation therapy. All four types of cells were relatively stable in group A. At the end of the consolidation therapy, there was a significant group difference in the proportion of these subsets (CD4+CD8−%: 29.6 vs 22.2, p = 0.018*; CD3−CD56+%: 25.9 vs 37.3, p < 0.01*; CD16+CD56+%: 23.2 vs 34.4, p < 0.01*; CD57+CD56+%: 21.9 vs 32.1, p < 0.001*; respectively). We concluded that patients with CD4+CD8− cells ≥23.1%, CD3−CD56+ cells ≤40.1%, CD16+CD56+ ≤35.6% or CD57+CD56+ ≤26.6% at the end of the consolidation therapy had significantly higher estimated overall TFS at 12 months than those without each condition (CD4+CD8−%: 84% vs 32%, p < 0.0001* (Fig.2); CD3−CD56+%: 77% vs 25%, p < 0.001* (Fig.3), CD16+CD56+%: 77% vs 25%, p < 0.0001*; CD57+CD56+%; 84% vs 46%, p < 0.01*, respectively). Although increased large granular lymphocytes and NK cells were reported to be associated with high responses to dasatinib (Int J Hematol. 2014; 99:p41), the unique profiles of lymphocyte subsets could predict successful discontinuation of dasatinib. Conclusion: Discontinuation of TKI in patients with chronic phase CML after consolidation therapy with dasatinib for 2 years was feasible with relatively high TFS. The unique profile of lymphocyte subsets might be able to predict successful discontinuation. Disclosures Kumagai: Bristol-Myers Squibb: Speakers Bureau; Novartis: Speakers Bureau; Pfizer: Speakers Bureau. Nakaseko:Bristol-Myers Squibb: Honoraria, Research Funding; Novartis: Honoraria; Pfizer: Honoraria, Research Funding. Nishiwaki:Novartis: Research Funding. Yoshida:Bristol-Myers Squibb: Honoraria, Speakers Bureau; Otsuka Pharmaceutical: Honoraria, Research Funding, Speakers Bureau; Pfizer: Honoraria, Speakers Bureau. Morita:Bristol-Myers Squibb: Speakers Bureau. Sakamoto:Takeda Pharmaceutical: Consultancy; Yakult: Other: Remuneration. Inokuchi:Bristol-Myers Squibb: Honoraria, Research Funding; Novartis: Honoraria; Celgene: Honoraria; Pfizer: Honoraria.

Molecular Response at 3 Months Measured with Genexpert BCR-ABL (IS) Platform Predicts Further Outcome in Chronic Myeloid Patients but the Cutoff Differs from the 10% Commonly Used with BCR-ABL (IS) EUTOS Method

Blood ◽  
2015 ◽  
Vol 126 (23) ◽  
pp. 2776-2776 ◽  
Author(s):  
Valentín García-Gutierrez ◽  
Maria Teresa Gómez Casares ◽  
Jimenez Velasco Antonio ◽  
Alonso Juan Manuel ◽  
Santiago Osorio ◽  
...  
Keyword(s):  
High Risk ◽  
Board Of Directors ◽  
Sensitivity And Specificity ◽  
Research Funding ◽  
Detection System ◽  
Chronic Phase ◽  
Molecular Response ◽  
Advisory Committees ◽  
Optimal Response ◽  
Historical Series

Abstract INTRODUCTION: In chronic myeloid leukemia (CML) patients in chronic phase (CML-CP), BCR-ABL levels ≤10% at 3 months measured by RT-qPCR (IS) has been consistently correlated with probabilities to obtain an optimal response at 12 months. Monitoring molecular response with automated cartridge-based detection system GeneXpert BCR-ABL (Cepheid®) method has shown an optimal correlation with standardized BCR-ABL (IS) EUTOS method in patients with complete cytogenetic response (CCyR). However, is not known if both methods are also equivalent when measuring BCR-ABL levels above 1%, and therefore, the utility of GeneXpert in order to evaluate response at 3 months must be confirmed. AIMS: To validate the predictive value of molecular response at 3 months with GeneXpert method METHODS: We have studied 125 new consecutive CML-CP patients treated with tyrosine kinase inhibitors (TKIs) followed in 13 centers. Median age at diagnosed was 55 years. The percentage of low, intermediate and high risk Sokal groups were 42%, 40% and 18% . First line treatment was imatinib (IM), nilotinib (NI), dasatinib (DA) or bosutinib (BO) in 58%, 28%, 13% and 1% of the patients, respectively. BCR-ABL level was measured by GeneXpert platform, where all necessary steps to measure BCR-ABL levels are automatically performed. ABL was used as gene control. The study was approved by the Ethics Committee. RESULTS: Median follow up was 43 months. The proportion of patients that achieved CCyR by 12 months, analyzed by intention to treat, was 84% (108/123). Probabilities for each specific TKI were 78%, 93%, 100% and 100% for IM, NI, DA and BO respectively. 23% (96/125) of patients required treatment changed due to resistance or intolerance. Treatment discontinuation probabilities were 32%, 11%, 5% and 0% for IM, NI, DA and BO respectively. Only 4% (5/125) did not achieve an optimal response at 3 months (BCR-ABL ≤10%), which is significant lower compare to results obtain with historical series when using EUTOS IS method. 10% cut-off at 3 month was unable to identify patients that achieved an optimal response in further evaluations. By 12 months, this cutoff did not correlate with probabilities to obtain CCyR (50% vs 86% (p=0.1) or major molecular response (MMR) (60% vs 79% (p=0.21)). In order to find a cutoff that could correlate with optimal response at 12 months, we used a receiver operating characteristic curve to identify the optimal cutoff in transcript level that would allow us to classify the patients as high risk or low risk with maximal sensitivity and specificity for each individual outcome. At 3 months, patients with transcript levels ≤ 1.6% had significantly better probabilities to obtain an optimal response by 12 months, with 81% and 94% sensitivity and specificity for CCyR. With this new cutoff, probabilities for CCyR and MMR at 12 months were 98% vs 54% (p<0.001) and 88% vs 56% (p<0.001) respectively (OR:. Finally, this cutoff has also been correlated with probability for treatment changed at any time (46% vs 16% (p=0.005)) CONCLUSIONS: The results of our study seem to show that the 10% threshold, commonly used to evaluate response at 3 months when using BCR-ABL (IS) EUTOS method, is not associated with probabilities to achieve further optimal responses when using the GeneXpert platform. We have shown how a new cutoff of 1,6% % at 3 months when using GeneXpert could better identify patients with lower risk to achieve an optimal response at 12 months. Disclosures García-Gutierrez: Pfizer: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; BMS: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Ariad: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding; Novartis: Consultancy, Membership on an entity's Board of Directors or advisory committees, Research Funding. Steegmann:Novartis: Consultancy, Honoraria, Research Funding, Speakers Bureau; BMS: Consultancy, Honoraria, Research Funding, Speakers Bureau; Pfizer: Consultancy, Honoraria, Research Funding, Speakers Bureau; Ariad: Consultancy, Honoraria, Research Funding, Speakers Bureau.

Propensity Score Matching Analysis Demonstrates the Use of Statin Enhances Chance of Achieving MR4.5 in Chronic Myeloid Leukemia Patients in Chronic Phase Following Imatinib Therapy Regardless of Other Clinical Features Including Age of the Patients

Blood ◽  
2015 ◽  
Vol 126 (23) ◽  
pp. 4026-4026
Author(s):  
Dennis Dong Hwan Kim ◽  
Feras Alfraih ◽  
Tanya Adityan ◽  
Jeffrey H. Lipton
Keyword(s):  
Propensity Score ◽  
Treatment Failure ◽  
Research Funding ◽  
Risk Group ◽  
Chronic Phase ◽  
Demographic Characteristics ◽  
Imatinib Therapy ◽  
Molecular Response ◽  
Cytogenetic Abnormalities ◽  
Statin Group

Abstract BACKGROUND: HMG-CoAreducatase inhibitor, or statin was suggested to increase therapeutic efficacy of anti-cancer therapy, to improve response rate of chemotherapy and to improve survival of cancer patients. Statin family of drugs is known to trigger tumor specific apoptosis and to result in growth arrest in leukemias (Penn, Leukemia 2002). Our previous study (Kim, ASH 2014) suggested the use of statin could enhance chance of achieving MR4.5 with imatinib therapy by 78.5% in 503 chronic myeloid leukemia (CML) patients in chronic phase. A concern has remained regarding that the clinical features of patients receiving statins are more related to the adherence to medication including age. For example, elderly patient who is known to be more adherent to medication dosing, is more likely to take statins. Thus clinical and demographic characteristics of patients should be taken account into the interpretation of enhancing therapeutic effect of statin in combination with imatinib. Propensity score matching (PSM) analysis is a statistical method to adjust for the clinical factors which affect the choice of treatment between different treatment options. Using PSM analysis, clinical and demographic characteristics between the groups with vs without statin can be balanced out, thus mimicking randomized controlled prospective trial. METHODS: Out of 408 patients treated with imatinib at 400mg daily dose as a frontline for CML in CP, 88 patients was identified as "statin" group, while remaining 320 as "non-statin" group. The statin group was defined as those on statin for cholesterol control at the time of imatinib commencement and remaining on statin while on at least 3 years or longer. There was significant difference in age between the statin vs non-statin group (median 62 vs 49, p<0.001). Other clinical factors did not show an difference between the 2 groups including gender, sokal risk group or additional cytogenetic abnormalities at the time of imatinib commencement. Using PSM analysis, we performed a case-control study with well-balanced pairs of patients treated with vs without statin. Pre-treatment variables included in the PSM were age, gender, Sokal risk group and additional cytogenetic abnormalities. A total of 84 case-control pairs were selected within 0.05 of a difference in propensity score. Paired analysis was adopted throughout the PSM analysis. Treatment outcomes were evaluated for the response to TKI therapy with respect to complete cytogenetic response (CCyR), major molecular response (MMR), molecular response at 4.5 (MR4.5) and for long-term outcomes including treatment failure, progression free- (PFS) and overall survival (OS). Cumulative incidence method considering competing risk was adopted to calculate the incidences of MCyR, CCyR, MMR and MR4.5. Discontinuation of imatinib was accounted as competing risk in the analysis. Treatment failure, PFS and OS was also evaluated. RESULT: After the PSM matching, each of 84 patients was selected, thus a total of 168 patients were included in the final analysis. With a median follow-up duration of 6 years (range 3 months to 14 years), clinical and demographic characteristics between the 2 groups did not show any differences including age (p=0.813), gender (p=0.440), Sokal risk group (p=0.888), and additional cytogenetic abnormalities (p=0.682), thus balancing all the confounding factors related to the use of statin. The statin group showed a higher MR4.5 rate than non-statin groups (p=0.019): 56.8±11.9% vs 47.0±11.6%, MR4.5 at 5 years. The use of statin increased the chance of achieving MR4.5 by 64.3% (hazard ratio 1.643 [1.080-2.501]). There is a trend of better MMR at 18 months in statin group compared to non-statin group: 68.2±10.7% vs 53.1±11.1% (p=0.072). However, the use of statin was not found to be associated with improvement in treatment failure (p=0.953), PFS (p=0.938) or OS (p=0.734). CONCLUSION: The use of statin is suggested to improve deeper molecular response following imatinib therapy in CML-CP patients. After taking account for potential confounding clinical variables using PSM analysis, we confirmed that independent of age or other clinical variables, the use of statin could enhance deeper molecular response following imatinib therapy in CML-CP patients. This approach of adopting statin in CML treatment could potentially increase the proportion of patients eligible for TKI discontinuation attempt. Disclosures Kim: Novartis Pharmaceuticals: Consultancy, Research Funding; Bristol-Myers Squibb: Consultancy, Research Funding. Lipton:Teva: Consultancy, Research Funding; Pfizer: Consultancy, Research Funding; Ariad: Consultancy, Research Funding; Bristol-Myers Squibb: Consultancy, Research Funding; Novartis Pharmaceuticals: Consultancy, Research Funding.

scholarly journals Efficacy of nilotinib in a young patient with high Sokal risk CML Ph+ in treatment failure after high dose imatinib

2015 ◽  
Vol 5 (5S) ◽  
pp. 7-14
Author(s):  
Sabina Russo ◽  
Giuseppa Penna ◽  
Arianna D’Angelo ◽  
Alessandro Allegra ◽  
Andrea Alonci ◽  
...  
Keyword(s):  
Treatment Failure ◽  
Standard Dose ◽  
Cytogenetic Response ◽  
High Dose ◽  
Molecular Response ◽  
Optimal Response ◽  
Mutational Screening ◽  
Therapeutic Choice ◽  
Lower Limits ◽  
Recent Evaluation

This article describes the case of a 44 year old man, at high-risk according to the Sokal Index, after CML Ph+ diagnosis, started imatinib at the standard dose (400 mg/day). Initially he reached optimal response, but at month 12, because of a loss of cytogenetic response, he was documented as a treatment failure. The mutational screening revealed no mutations and the blood level testing (BLT) showed values of ​​lower limits, therefore he increased imatinib to 800 mg/day. This therapeutic choice did not result in the achievement of an optimal response and the imatinib compliance was deteriorated. So, after nearly 12 months of treatment with high dose imatinib, we considered the treatment as a failure, and he switched to nilotinib, at the dose of 800 mg/day. After only 3 months of treatment, he reached complete cytogenetic response (CCyR) and major molecular response (MMolR), which the patient continues to maintain, as documented by the recent evaluation at month 30.

scholarly journals Chronic myeloid leukemia: successful therapy with nilotinib in a young patient with high Sokal risk and in sub-optimal response with imatinib

2015 ◽  
Vol 4 (6S) ◽  
pp. 13-16
Author(s):  
Fausto Palmieri
Keyword(s):  
Chronic Myeloid Leukemia ◽  
Young Patient ◽  
Myeloid Leukemia ◽  
Second Generation ◽  
Kinase Inhibitor ◽  
Standard Dose ◽  
Chronic Phase ◽  
Molecular Response ◽  
Optimal Response ◽  
Increased Risk

Here we describe a case of a young patient with chronic myeloid leukemia, at high-risk according to the Sokal index, who started imatinib at standard dose and obtained a sub-optimal response at 12 months. This condition was not automatically an indication to change therapy, but considering the patient as suboptimal, we decided to switch to a second-generation tyrosine kinase inhibitor (TKI), nilotinib 800 mg/die, obtaining soon a complete cytogenetic response (CCYR), thereafter a major molecular response (MMolR). Delayed achievement of cytogenetic and molecular is associated with increased risk of progression among patients with chronic myeloid leukemia in early chronic phase receiving imatinib therapy. Therefore we can hypothesise that this kind of patient could be elegible for an early switch to second-generation TKI.

scholarly journals Accumulation of DNA Damage and Alteration of the DNA Damage Response in Chronic Myeloid Leukemia

Blood ◽  
2019 ◽  
Vol 134 (Supplement_1) ◽  
pp. 5364-5364
Author(s):  
Henning D. Popp ◽  
Vanessa Kohl ◽  
Johanna Flach ◽  
Susanne Brendel ◽  
Helga Kleiner ◽  
...  
Keyword(s):  
Dna Damage ◽  
Myeloid Leukemia ◽  
Research Funding ◽  
De Novo ◽  
Chronic Phase ◽  
Molecular Response ◽  
Healthy Individuals ◽  
Blastic Transformation ◽  
Γh2ax Foci ◽  
Tki Treatment

The accumulation of DNA damage and the alteration of the DNA damage response (DDR) are critical features of genetic instability that is presumed to be implicated in BCR/ABL1-mediated blastic transformation of chronic myeloid leukemia (CML). The aim of our study was to analyze underlying mechanisms of genetic instability with regard to DNA damage such as DNA double-strand breaks (DSB), DSB repair and DDR signaling during blastic transformation of CML. Immunofluorescence microscopy of γH2AX was performed for quantification of DSB in peripheral blood mononuclear cells (PBMC) of 8 healthy individuals, 24 chronic phase (CP)-CML patients under current/discontinued tyrosine kinase inhibitor (TKI) treatment (21 patients in deep molecular response (DMR), 3 patients in major molecular response (MMR)), 5 CP-CML patients under current/discontinued TKI treatment with loss of MMR, 3 de novo non-treated CP-CML patients and 2 blast phase (BP)-CML patients. In addition, immunofluorescence microscopy of γH2AX/53BP1 was used for semi-quantification of error-prone DSB repair. Furthermore, immunoblotting of p-ATM, p-ATR, p-CHK1, p-CHK2 and p-TP53 was performed in PBMC of CML patients in comparison to PBMC of healthy individuals. Our analysis revealed an increase in numbers of γH2AX foci in PBMC of CP-CML patients under current/discontinued TKI treatment with loss of MMR (1.8 γH2AX foci per PBMC ± 0.4), in PBMC of de novo non-treated CP-CML patients (2.3 γH2AX foci per PBMC ± 0.7) and in PBMC of BP-CML patients (4.9 γH2AX foci per PBMC ± 0.9) as compared to the number of γH2AX foci in PBMC of healthy individuals (1.0 γH2AX foci per PBMC ± 0.1) and in PBMC of CP-CML patients under current/discontinued TKI treatment in DMR/MMR (1.0 γH2AX foci per PBMC ± 0.1) (Figure 1A and B). Analysis of co-localizing γH2AX/53BP1 foci in PBMC suggested progressive activation of error-prone nonhomologous end-joining repair mechanisms during blastic transformation in CML. Signatures of p-ATM, p-ATR, p-CHK1, p-CHK2 and p-TP53 indicated alterations of the DDR. In summary, our data provide evidence for an accumulation of DNA damage in PBMC of CML patients towards BP-CML patients. We hypothesize that ongoing DSB generation, error-prone DSB repair and DDR alterations might be critical mechanisms of blastic transformation in CML. Figure 1 Analysis of γH2AX foci in freshly isolated peripheral blood mononuclear cells (PBMC) of healthy individuals and chronic myeloid leukemia (CML) patients. (A) Exemplary immunofluorescence microscopic images of γH2AX foci (green, Alexa 488) and cell nuclei (blue, DAPI) in PBMC of a healthy individual (HEALTHY#3), a chronic phase CML patient with a deep molecular response to tyrosine kinase inhibitor (CP-CML DMR#16), a de novo non-treated chronic phase CML patient (CP-CML#1) and a blast phase CML patient (BP-CML#2). (B) γH2AX foci levels in PBMC of healthy individuals and in PBMC of CML patients. Figure 1 Disclosures Saussele: Pfizer: Honoraria; Novartis: Honoraria, Research Funding; Incyte: Honoraria, Research Funding; BMS: Honoraria, Research Funding. Fabarius:Novartis: Research Funding.

Does Previous Interferon Use Have Negative Effect on Imatinib Response in Chronic Myeloid Leukemia (CML)? A Single Center Study.

Blood ◽  
2006 ◽  
Vol 108 (11) ◽  
pp. 4821-4821
Author(s):  
Mustafa Yenerel ◽  
Reyhan Diz-Kucukkaya ◽  
Naciye Demirel ◽  
Mesut Ayer ◽  
Selim Yavuz ◽  
...  
Keyword(s):  
Bone Marrow ◽  
Chronic Phase ◽  
Cytogenetic Response ◽  
Molecular Response ◽  
First Line ◽  
Group I ◽  
Blastic Phase ◽  
Significant Difference ◽  
Group Ii ◽  
Ifn Treatment

Abstract Aim: Effectiveness of imatinib in CML was evaluated on a cohort of 104 patients with a median 29 months of observation time, recruited between 3/2002 and 2/2006. Patients and methods: 104 patients diagnosed as having CML between 1990–2006 were included in this study. Their median age was 44 years (19–77) and 55% of patients were male. Imatinib was used in a dose of 400mg/day for chronic phase and 600mg/day for accelerated and blastic phase. In chronic phase patients with no cytogenetic response in 1 year and in accelerated or blastic phase patients with no hematologic response in 3 months, doses were increased to 600mg/day and 800 mg/day respectively. Interferon (IFN) treatment had been used as α-IFN 5 MIU/m2 daily combined with or without monthly courses of cytosine arabinoside (Ara-C) 20 mg/m2 for 10 days in 50 patients before imatinib. Cytogenetic response (CR) was monitored on bone marrow metaphases collected at baseline, 3, 6, 9 and 12 months during the first year, and every 6 months thereafter. CR was quantified by 20 metaphases Ph in bone marrow: 0% as complete (CCR), 1–35% major as (MjCR) and &gt; 95% as imatinib failure. Molecular response followed by PCR in bone marrow samples. We stratified the patients according to previous IFN treatment in two groups. CML patients who were treated with imatinib as a first line therapy were analyzed as Group I. Other patients who were treated initially with IFN and ara-C and those were switched to imatinib because of intolerance or unresponsiveness were accepted as Group II. Results: Age, sex distribution and disease phases of both groups were quite similar. Therapy responses are summarized in Table 1. Hematological response (HR) was seen in 90,4 % of the patients (94/104) in median 54 days (11–149) for Group I and 41 days (15–193) for Group II. There wasn’t any difference according to the time elapsed for HR (p=0,79). Cytogenetic data were interesting in our patients. As a total result, CR were achieved in 77,8 % of the patients in median 5,1 months (84 days– 2,7 years). CR rate was significantly higher in Group I (p=0.019). When we compared two groups according to early cytogenetic response in first 6 months, Group I had also much better results (p=0.049). CCR were achieved 35,6 % of the patients (37/104) and there wasn’t any difference between the groups (p=0,25). Molecular response was achieved in 19,2% of the patients followed by PCR (19/87) and there was no significant difference (p=0,15). We conclude that imatinib is highly effective as a first line agent in CML patients. Advanced disease age probably is the most important factor for the lower response rates in the second group. But, the role of previous IFN therapy should also be questioned. As a summary, imatinib should be used in every CML patient without any delay in order to get higher and sooner CR. Tablo 1. Imatinib response of the 104 patients with CML. HR (p=0.89) CR (p=0.019) MjCR in 6 months(p=0.049) CCR(p=0.25) Mol. Response(p=0,15) Imatinibfailure (p=0.03) Imatinib Follow-up Group I 90,7% (49/54) 77,8% (42/54) 57,4% (31/54) 40,7% (22/54) 30% (12/40) 22,2% (12/54) 22,1 months (3,7 months -3,5 yrs) Group II 88% (44/50) 56% (28/50) 38% (19/50) 30% (15/50) 17% (8/47) 40% (20/50) 3 years (9months-5,1 yrs)

Dasatinib Efficacy in Patients with Chronic Myeloid Leukemia in Chronic Phase (CML-CP) and Pre-Existing BCR-ABL Mutations

Blood ◽  
2008 ◽  
Vol 112 (11) ◽  
pp. 449-449 ◽  
Author(s):  
Martin C Müller ◽  
Jorge Cortes ◽  
Dong-Wook Kim ◽  
Brian J. Druker ◽  
Philipp Erben ◽  
...  
Keyword(s):  
Amino Acids ◽  
Median Time ◽  
Chronic Phase ◽  
Response Rates ◽  
Cytogenetic Response ◽  
Molecular Response ◽  
Imatinib Treatment ◽  
Imatinib Resistant ◽  
Dasatinib Treatment

Abstract Dasatinib (SPRYCEL®) is an effective BCR-ABL inhibitor that is 325-fold more potent than imatinib and 16-fold more potent than nilotinib in vitro against unmutated BCR-ABL. Across a series of phase II and III trials, dasatinib has demonstrated durable efficacy in patients with CML following resistance, suboptimal response, or intolerance to imatinib. BCR-ABL mutations are an important cause of imatinib failure and suboptimal response. Here, the efficacy of dasatinib in patients with CML-CP who had baseline BCR-ABL mutations following imatinib treatment was analyzed using data from three trials (CA180-013, -017, and -034). Mutational assessment of the BCR-ABL kinase domain was performed using RT-PCR and direct sequencing of peripheral blood cell mRNA. Hematologic, cytogenetic, and molecular response rates were reported after ≥24 mos of follow-up. Duration of response, progression-free survival (PFS), and overall survival (OS; in 013/034) were calculated using Kaplan-Meier analysis, and rates were estimated at the 24-mo time point. Of 1,150 patients with CML-CP who received dasatinib, 1,043 had a baseline mutational assessment and were analyzed further. Of these, 402 patients (39%) had a BCR-ABL mutation, including 8% of 238 imatinib-intolerant and 48% of 805 imatinib-resistant patients. Excluding known polymorphisms, 64 different BCR-ABL mutations were detected affecting 49 amino acids, with G250 (n=61), M351 (n=54), M244 (n=46), F359 (n=42), H396 (n=37), Y253 (n=26), and E255 (n=25) most frequently affected. Dasatinib treatment in patients with or without a baseline BCR-ABL mutation, respectively, resulted in high rates of major cytogenetic response (MCyR; 56% vs 65%), complete cytogenetic response (CCyR; 44% vs 56%), major molecular response (MMR; 33% vs 45%); PFS (70% vs 83%), and OS (89% vs 94%) (Table). After 24 mos, CCyRs in patients with or without a BCR-ABL mutation had been maintained by 84% vs 85%, respectively, of those achieving this response. Among patients with mutations who received dasatinib 100 mg once daily, which has a more favorable clinical safety profile, efficacy and durability were similar (MCyR: 55%; CCyR: 41%; MMR: 36%; PFS: 73%; OS: 90%). In general, high response rates and durable responses were observed in patients with different mutation types, including highly imatinib-resistant mutations in amino acids L248, Y253, E255, F359, and H396. When responses were analyzed according to dasatinib cellular IC50 for individual BCR-ABL mutations, dasatinib efficacy was observed in 44 patients who had any of 5 imatinib-resistant mutations with a dasatinib cellular IC50 &gt;3 nM (Q252H, E255K/V, V299L, and F317L, excluding T315I), including MCyR in 34%, CCyR in 25%, MMR in 18%, PFS in 48%, and OS in 81%. Among patients whose mutations had a dasatinib IC50 ≤3 nM (n=254) or unknown IC50 (n=83), responses and durability were comparable to patients with no BCR-ABL mutation. As expected, few patients with a T315I mutation (IC50 &gt;200 nM; n=21) achieved a response. Among 70 patients with &gt;1 mutation, a MCyR was achieved in 53% and a CCyR in 37%. Among patients with mutational analysis at last follow-up (n=162), 42 (26%) retained a BCR-ABL mutation (20 retained a mutation with IC50 &gt;3 nM), 42 (26%) lost a mutation (5 lost a mutation with IC50 &gt;3 nM), and 44 (27%) developed a new mutation (39 developed a mutation with IC50 &gt;3 nM), with some patients counted in more than one category. Overall, this analysis demonstrates that dasatinib has broad efficacy against all BCR-ABL mutations except for T315l. For patients with BCR-ABL mutations, dasatinib treatment is associated with durable responses and favorable long-term outcomes. Table Analysis by dasatinib IC50 No BCR-ABL mutation BCR-ABL mutation BCR-ABL mutation treated with 100 mg QD &gt;3 nM (excl. T315I) 3 nM* Unknown IC50** Some patients had &gt;1 mutation. *Excluding patients with a concurrent mutation with dasatinib IC50 &gt;3 nM. **Excluding patients with a concurrent mutation with known dasatinib IC50. Patients, n 641 402 49 44 254 83 Response rates (≥24 mos of follow-up), % CHR 93 90 90 82 94 96 MCyR 65 56 55 34 58 73 CCyR 56 44 41 25 47 54 MMR 45 33 36 18 34 43 Median time to MCyR, mos 2.8 2.9 2.8 5.7 2.9 2.8 Median time to CcyR, mos 3.0 5.3 3.0 5.7 5.4 3.4 24-mo PFS (95% CI), % 83 (79.8–86.5) 70 (65.3–75.2) 73 (60.1–86.3) 48 (31.2–64.7) 73 (66.6–78.9) 89 (82.3–96.3) 24-mo OS (95% CI), % 94 (91.4– 95.7) 89 (85.1– 92.1) 90 (81.2– 98.3) 81 (68.8– 93.8) 90 (85.8– 94.2) 96 (91.2–100)

Long Term Follow up of Patients with CML in Chronic Phase Treated with First-Line Imatinib Suggests That Earlier Achievement of a Major Molecular Response Leads to Greater Stability of Response.

Blood ◽  
2008 ◽  
Vol 112 (11) ◽  
pp. 2113-2113 ◽  
Author(s):  
Susan Branford ◽  
Rebecca Lawrence ◽  
Andrew Grigg ◽  
John Francis Seymour ◽  
Anthony Schwarer ◽  
...  
Keyword(s):  
Chronic Phase ◽  
Low Risk ◽  
Initial Slope ◽  
Molecular Response ◽  
Average Dose ◽  
Major Molecular Response ◽  
First Line ◽  
Significant Difference

Abstract A major molecular response (MMR) by 12 or 18 months (m) of standard dose imatinib for patients (pts) with newly diagnosed chronic phase CML is associated with a low risk of progression to accelerated phase or blast crisis. Phase II/III trials suggest that MMR may be achieved earlier with higher doses of imatinib. We determined whether the timing of MMR affects the long term stability of response with regard to the acquisition of BCR-ABL mutations and/or loss of MMR (collectively defined as an “event”) for pts with up to 8 years of follow up since commencing first-line imatinib. All pts treated with 400 to 600mg of first-line imatinib who were monitored regularly at our institution for BCR-ABL levels by real-time quantitative PCR and mutation analysis by direct sequencing were evaluated: 181 pts were followed for a median of 45m (range (r) 3–96m). The event rate was compared for pts dependent on the time to MMR (≤0.1% IS (international scale)) in 6m intervals to 18m of imatinib. The events for pts with undetectable BCR-ABL (complete molecular response, CMR) were also determined. Strict sensitivity criteria were used for CMR: undetectable BCR-ABL where the sensitivity of analysis indicated BCR-ABL was &lt;0.003% IS, (equivalent to at least 4.5 log below the standardized baseline) which was confirmed on a subsequent analysis. Loss of MMR was defined as a confirmed &gt;2 fold rise from nadir to a level &gt;0.1% IS in pts who maintained imatinib dose. 144/181 pts (80%) achieved MMR at a median of 12m (r 3–53m). Consistent with other studies, maintaining a higher dose of imatinib in the first 6m of therapy was associated with a significantly higher frequency of pts achieving MMR by 6m. 118 pts received an average dose of &lt;600mg in the first 6m and 18/118 (15%) achieved MMR by 6m, whereas 63 pts received an average dose of 600mg in the first 6m and 23/63 (37%) achieved MMR by 6m, P=0.002. Mutations were detected in 14/181 pts (8%) at a median of 9m (r 3–42m). An event occurred in 8 pts with MMR at a median of 36m (r12–57m) after commencing imatinib, including one patient who had achieved CMR. Mutations were found in 4 pts and 3/4 lost MMR. The remaining 4 lost MMR without a mutation. The one patient with a mutation who did not lose MMR had a 3-fold rise in BCR-ABL at the time of mutation detection and responded to a higher imatinib dose. The other pts with mutations had therapeutic intervention upon cytogenetic relapse (2) or loss of MMR (1). The 4 pts with loss of MMR and no mutation had accelerated phase (1), cytogenetic relapse (2) and one maintained CCR with 3m of follow up. The median fold rise in BCR-ABL upon loss of MMR was 26 (r 4–220). The probability of an event if MMR was achieved by a) 6m was 0% (n=41 evaluable pts), b) &gt;6 to 12m was 12% (n=40) and c) 12 to 18m was 19% (n=33). The median follow up since MMR was achieved was not significantly different for the groups: 49m (r 3–87m), 38m (r 6–87m), 40m (r 9–78m), respectively, P=0.5. The risk of an event for pts with MMR achieved by 6m was significantly lower than in pts with MMR achieved by &gt;6 to 18m, P=0.04. CMR occurred in 55 pts who were followed for a median of 24m (r 3–55m) after its attainment. Only 1 event occurred in these 55 pts, which was at 6m after CMR was achieved and 57m after commencing imatinib. This patient had maintained MMR for 45m but loss of a major cytogenetic response occurred 6m after loss of MMR. There was a significant difference in the probability of CMR by 60m of imatinib dependent on the time to MMR, P&lt;0.0001 (Figure). All pts failed to achieve CMR by 60m if not in MMR at 18m whereas the actuarial rate of CMR at 60m was 93% in those with MMR by 6m. The initial slope of BCR-ABL decline correlated strongly with the decline over the longer term. The mean time to CMR after attainment of MMR was significantly faster for pts with MMR by 6m compared to those with MMR at &gt;6 to 12m and &gt;12 to 18m: 24m vs 37m vs 42m, respectively, P=0.001. This suggests the rate of BCR-ABL reduction below the level of MMR was faster in pts with MMR by 6m, which may be clinically beneficial as none of these pts had a subsequent event. Based on these findings we propose that inducing earlier molecular responses with higher dose imatinib or more potent kinase inhibitors may lead to more durable and deeper responses. It remains possible however, that early molecular response reflects a more biologically favourable disease rather than being the direct cause of more durable response. Finally, CMR was associated with an extremely low risk of events, making it an appropriate next target of therapy after MMR is achieved. Figure Figure

Response and Outcomes to Nilotinib at 24 Months in Imatinib-Resistant Chronic Myeloid Leukemia Patients in Chronic Phase (CML-CP) and Accelerated Phase (CML-AP) with and without BCR-ABL Mutations.

Blood ◽  
2009 ◽  
Vol 114 (22) ◽  
pp. 1130-1130 ◽  
Author(s):  
Jerald P. Radich ◽  
Giovanni Martinelli ◽  
Andreas Hochhaus ◽  
Enrico Gottardi ◽  
Simona Soverini ◽  
...  
Keyword(s):  
Board Of Directors ◽  
Median Time ◽  
Research Funding ◽  
Philadelphia Chromosome ◽  
Chronic Phase ◽  
Cytogenetic Response ◽  
Molecular Response ◽  
Advisory Committees ◽  
Imatinib Resistant

Abstract Abstract 1130 Poster Board I-152 Background Nilotinib is a selective and potent BCR-ABL inhibitor, with in vitro activity against most BCR-ABL mutants (excluding T315I) indicated for the treatment of patients with Philadelphia chromosome positive (Ph+) CML in CPor AP resistant or -intolerant to prior therapy, including imatinib. In a previous analysis of nilotinib in patients with BCR-ABL mutations, mutations occurring at three specific amino acid residues (E255K/V, Y253H, and F359C/V) were shown to be associated with less favorable response to nilotinib. The current analysis is based on mature data with a minimum follow-up of 24-months for all patients. Outcomes of patients at 24 months were analyzed by mutation type. Methods Imatinib-resistant CML-CP (n = 200) and CML-AP (n = 93) patients were subdivided into the following mutational subsets: no mutation, sensitive mutations (including mutations with unknown in vitro IC50). or E255K/V, Y253H, or F359C/V mutations at baseline. Patients with mutations of unknown in vitro sensitivity were classified as sensitive in this analysis based on a previous finding that patients with these mutations responded similarly to nilotinib as patients with sensitive mutation. Patients with baseline T315I mutations were excluded from this analysis. Patient groups were analyzed for kinetics and durability of cytogenetic and molecular response to nilotinib, as well as event-free survival (EFS), defined as loss of hematologic or cytogenetic response, progression to AP/BC, discontinuation due to disease progression, or death, and overall survival (OS). Results In CML-CP and -AP patients with no mutation, sensitive mutations, or E255K/V, Y253H, or F359C/V mutations, hematologic, cytogenetic and molecular responses are provided in the Table. Overall, patients with no mutations responded similarly to patients with sensitive mutations, whereas patients with E255K/V, Y253H, or F359C/V mutations had less favorable responses. This correlation was observed in both CML-CP and CML-AP patients, respectively. Median time to CCyR was 3.3 months (range, 1.0–26.7) for CML-CP patients with no mutations, and 5.6 months (range, 0.9–22.1) for patients with sensitive mutations. At 24 months, CCyR was maintained in 74% of CML-CP patients with no mutation and in 84% of patients with sensitive mutations. One patient with CML-CP and an E255K mutation achieved CCyR at 25 months and maintained until last assessment at 30 months. Median time to MMR was similar at 5.6 months (range, 0.9–25.8) for CML-CP patients with no mutations and 5.6 months (range, 2.7–22.1) for patients with sensitive mutations. No patient with a less sensitive mutation achieved MMR. Median EFS and 24-month estimated OS rate are provided in the Table. Conclusions Imatinib-resistant CML-CP and CML-AP patients treated with nilotinib therapy with BCR-ABL mutations (excluding E255K/V, Y253H, or F359C/V) achieved rapid and durable cytogenetic responses, and estimated EFS and OS at 24 months similar to that of patients with no mutations, respectively. Patients with E255K/V, Y253H, or F359C/V mutations had lower and less-durable responses and shorter EFS than patients with sensitive mutations. Alternative therapies may be considered for patients with these uncommon mutations (E255K/V, Y253H, and F359C/V). Disclosures Radich: Novartis: Consultancy, Honoraria, Research Funding. Hochhaus:Novartis: Research Funding. Branford:Novartis Pharmaceuticals: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding; Bristol-Myers Squibb: Honoraria, Research Funding. Shou:Novartis: Employment. Haque:Novartis: Employment. Woodman:Novartis: Employment. Kantarjian:Novartis: Research Funding. Hughes:Bristol-Myers Squibb: Advisor, Honoraria, Research Funding; Novartis: Advisor, Honoraria, Research Funding. Kim:Novartis: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding; BMS: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding; Wyeth: Research Funding. Saglio:Novartis: Consultancy, Speakers Bureau; BMS: Consultancy, Speakers Bureau.

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