scholarly journals Dasatinib-induced hemorrhagic colitis complicated with cytomegalovirus infection

2017 ◽  
Vol 9 (4) ◽  
Author(s):  
Aya Nakaya ◽  
Yoshiko Azuma ◽  
Shinya Fujita ◽  
Atsushi Satake ◽  
Takahisa Nakanishi ◽  
...  
Keyword(s):  
Chronic Myeloid Leukemia ◽  
Myeloid Leukemia ◽  
Cytomegalovirus Infection ◽  
Kinase Inhibitor ◽  
Chronic Phase ◽  
Hemorrhagic Colitis ◽  
Molecular Response ◽  
Pathological Findings ◽  
Major Molecular Response ◽  
Kinase Inhibitory Activity

A 69-year-old man with chronic-phase chronic myeloid leukemia was initially treated with 100 mg dasatinib once a day. Despite a major molecular response within 9 months, he developed hemorrhagic colitis 32 months after starting dasatinib. Colonoscopy identified multiple hemorrhagic ulcers in the transverse colon. The pathological findings indicated cytomegalovirus infection. Dasatinib was stopped and he was started on ganciclovir. Three months later, colonoscopy confirmed the disappearance of the hemorrhagic ulcers. Dasatinib is a second-generation tyrosine kinase inhibitor used to treat chronic myeloid leukemia. As a multi-kinase inhibitor that acts on SRC-family kinases, its broader off-target kinase-inhibitory activity may account for the adverse events of dasatinib. Although gastrointestinal bleeding is common in patients taking dasatinib, the combination of cytomegalovirus infection and hemorrhagic colitis in the absence of systemic immunodeficiency is rare. Based on this case of dasatinibinduced hemorrhagic colitis with cytomegalovirus infection, we describe a possible mechanism and effective treatment.

Mutation Analysis of ABL1 Gene and its Relation to the Achievement of Major Molecular Response in Indonesian Chronic Myeloid Leukemia Patients

2020 ◽  
Vol 17 (1) ◽  
pp. 48-54
Author(s):  
Reni Widyastuti ◽  
Melva Louisa ◽  
Ikhwan Rinaldi ◽  
Riki Nova ◽  
Instiaty Instiaty ◽  
...  
Keyword(s):  
Chronic Myeloid Leukemia ◽  
Imatinib Mesylate ◽  
Myeloid Leukemia ◽  
Kinase Inhibitor ◽  
Chronic Phase ◽  
Kinase Domain ◽  
Molecular Response ◽  
Major Molecular Response ◽  
Cross Sectional ◽  
Imatinib Resistance

Background: Imatinib mesylate is the first tyrosine kinase inhibitor approved for chronic myeloid leukemia (CML) therapy. Imatinib is an effective drug. However, previous studies have shown that about 20-30% of patients eventually would develop resistance to imatinib. Approximately 40% of imatinib resistance is associated with BCRABL kinase domain mutation. One of the most common and serious variations account for imatinib response is T315I of ABL1 gene. Objective: The study aimed to examine the association of T315I mutation with the ABL1 gene and its relation to major molecular response (MMR) achievement in CML patients. This study also examined other mutations adjacent to T315I, i.e., F311I, F317L, and different possible variations in the ABL1 gene. Methods: This was a cross-sectional study on Indonesian CML patients in chronic phase. We analyzed 120 blood samples from patients in chronic phase who have received imatinib mesylate (IM) for ≥12 months. Results: There were no T315I, F311I, and F317L mutations found in this study. However, we found another variation, which was 36 substitutions from A to G at position 163816 of ABL1 gene (according to NG_012034.1). Conclusions: We found no T315I, F311I, and F317L mutations in this study. Our findings suggest that there might be other factors that influenced the MMR achievement in our study patients. However, there were 36 substitutions from A to G at position 163.816 (according to NG_012034.1) that needed further examination to explore the significance of this mutation in clinical practice.

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 A Retrospective Analysis about Frequency of Monitoring in Italian Chronic Myeloid Leukemia Patients after Discontinuation

2020 ◽  
Vol 9 (11) ◽  
pp. 3692
Author(s):  
Matteo Dragani ◽  
Giovanna Rege Cambrin ◽  
Paola Berchialla ◽  
Irene Dogliotti ◽  
Gianantonio Rosti ◽  
...  
Keyword(s):  
Chronic Myeloid Leukemia ◽  
Tyrosine Kinase ◽  
Myeloid Leukemia ◽  
Kinase Inhibitors ◽  
Kinase Inhibitor ◽  
Chronic Phase ◽  
Molecular Response ◽  
Molecular Monitoring ◽  
Delay In Diagnosis ◽  
Number Of Patients

Successful discontinuation of tyrosine kinase inhibitors has been achieved in patients with chronic-phase chronic myeloid leukemia (CML). Careful molecular monitoring after discontinuation warrants safe and prompt resumption of therapy. We retrospectively evaluated how molecular monitoring has been conducted in Italy in a cohort of patients who discontinued tyrosine kinase inhibitor (TKI) treatment per clinical practice. The outcome of these patients has recently been reported—281 chronic-phase CML patients were included in this subanalysis. Median follow-up since discontinuation was 2 years. Overall, 2203 analyses were performed, 17.9% in the first three months and 38.4% in the first six months. Eighty-six patients lost major molecular response (MMR) in a mean time of 5.7 months—65 pts (75.6%) during the first six months. We evaluated the number of patients who would experience a delay in diagnosis of MMR loss if a three-month monitoring schedule was adopted. In the first 6 months, 19 pts (29.2%) would have a one-month delay, 26 (40%) a 2-month delay. Very few patients would experience a delay in the following months. A less intense frequency of monitoring, particularly after the first 6 months off treatment, would not have affected the success of treatment-free remission (TFR) nor put patients at risk of progression.

Dasatinib Is Well-Tolerated and Efficacious in Imatinib-Intolerant Patients with Chronic-Phase Chronic Myeloid Leukemia (CP-CML).

Blood ◽  
2009 ◽  
Vol 114 (22) ◽  
pp. 1128-1128 ◽  
Author(s):  
Hanna Jean Khoury ◽  
Michael J. Mauro ◽  
Yousif Matloub ◽  
Tai-Tsang Chen ◽  
Erkut Bahceci ◽  
...  
Keyword(s):  
Chronic Myeloid Leukemia ◽  
Median Duration ◽  
Myeloid Leukemia ◽  
Research Funding ◽  
Kinase Inhibitor ◽  
Chronic Phase ◽  
Phase Iii ◽  
Hematologic Toxicity ◽  
Molecular Response

Abstract Abstract 1128 Poster Board I-150 Imatinib (IM), a tyrosine kinase inhibitor (TKI), has been the mainstay of treatment for chronic phase chronic myeloid leukemia (CP-CML). However, IM resistance and intolerance are of considerable clinical relevance. Dasatinib (DAS), a second-line TKI, is effective in the IM-intolerant patient population. The purpose of this study was to determine baseline factors that can affect DAS response and evaluate long term efficacy in this population. Intolerance to IM was defined as ≥ Grade 3 non-hematologic toxicity and/or Grade 4 hematologic toxicity lasting > 7 days. A total of 271 Ph+ CP-CML IM-intolerant patients who received DAS were pooled from two randomized trials (Phase II-trial, CA 180013 and Phase III trial, CA 180034). DAS doses were 50 mg BID (n=43), 70 mg BID (n=141), 100 mg QD (n=43) or 140 mg QD (n=44). At baseline, the median duration of disease for the IM-intolerant patients was 24 months (range: 0.9-182.5) and the median duration of IM therapy was 9 months (range: 0.03-69.06). Of these patients, 46 (17%) had hematologic toxicity and 228 (84.1%) had non-hematologic toxicity to IM. Seventy-nine (29%) patients had prior complete cytogenetic response (CCyR) on IM and 171 (63%) patients did not. The data for prior CyR to IM was not reported for 21 (7.7%) patients. Of the 79 patients who had achieved CCyR on IM, 30 patients had maintained CCyR and 49 patients had lost this response prior to start of DAS. Of the 171 patients who did not achieve CCyR on IM, 62 (36.3%) had been on IM for 3 12 months and 109 (63.7%) for < 12 months. At 2-year follow up of the 271 patients treated with DAS, 121 (44.6%) discontinued DAS (7.4% due to hematologic toxicity and 14% due to non-hematologic toxicity). Of the patients who were intolerant of IM due to hematologic toxicity (n=46), 10 (21.7%) discontinued DAS due to hematologic toxicity, and 3 (6.5%) due to other toxicities. Of the patients with non-hematologic IM-intolerance (n=228), 10 (4.4%) discontinued DAS due to hematologic toxicity, and 35 (15.4%) due to other toxicities. The median average daily dose of DAS was 99 mg/day in the population who achieved CCyR on DAS and 71.5 mg/day in the population who did not achieve CCyR on DAS. The probability of achieving CCyR on DAS was 43.5% in patients with hematologic IM-intolerance versus 78.9% with non-hematologic IM-intolerance. The CCyR, major molecular response (MMR), progression-free survival (PFS) and overall survival (OS) at 2-year follow up for the groups classified by their CCyR status at start of DAS or IM-intolerance status are summarized in Table 1. Conclusions DAS was well-tolerated and associated with high rates of CyR in IM-intolerant patients. Patients with a prior CCyR to IM and those who switched due to non-hematologic imatinib-intolerance had the highest rates of CCyR and MMR on DAS, while patients without CCyR after more than 12 months of IM therapy or IM-intolerance due to hematologic toxicity had the lowest rates of CCyR and MMR. Disclosures Khoury: BMS: Honoraria; Wyeth: Honoraria; Novartis Pharmaceuticals: Honoraria; Chemgenex: Honoraria; Genzyme: Honoraria. Mauro:Bristol-Myers Squibb: Membership on an entity's Board of Directors or advisory committees, Research Funding. Matloub:Bristol-Myers Squibb: Employment. Chen:Bristol-Myers Squibb: Employment. Bahceci:Bristol-Myers Squibb: Employment. Deininger:Novartis: Consultancy; Bristol-Myers Squibb: Consultancy; Calistoga: Research Funding; Genzyme: Research Funding.

Clinical Efficacy and Safety Of Dasatinib For Newly Diagnosed Chronic Myeloid Leukemia In Chronic Phase In Japan

Blood ◽  
2013 ◽  
Vol 122 (21) ◽  
pp. 1493-1493
Author(s):  
Kohei Yamaguchi ◽  
Kazunori Murai ◽  
Shigeki Ito ◽  
Tomoaki Akagi ◽  
Kazuei Ogawa ◽  
...  
Keyword(s):  
Chronic Myeloid Leukemia ◽  
Myeloid Leukemia ◽  
Chronic Phase ◽  
Cytogenetic Response ◽  
Molecular Response ◽  
Newly Diagnosed ◽  
Efficacy And Safety ◽  
Major Molecular Response ◽  
Once Daily

Abstract Background Dasatinib is a second-generation BCR-ABL inhibitor that has a 325-fold higher potency than imatinib and a 16-fold higher potency than nilotinib in vitro. The previous report from the global DASISION trial showed dasatinib resulted in significantly higher and faster rates of complete cytogenetic response (CCyR) and major molecular response (MMR) compared with imatinib. We conducted a phase II study to evaluate the efficacy and safety of dasatinib in patients with newly diagnosed chronic-phase chronic myeloid leukemia (CML-CP) in Japan. Methods Eighty newly diagnosed CML-CP patients were include in this study. Patients received dasatinib 100mg once daily. Treatment was continued until disease progression or unacceptable toxicity. Primary end point was the rate of major molecular response (MMR) by 12 months. MMR defined as a BCR-ABL transcript level of 0.1% or lower on the International scale by means of a real-time quantitative reverse transcriptase-polymerase chain reaction (RT-PCR) in peripheral blood. Secondary end points were the rate of complete cytogenetic response (CCyR) by 12 months, the rate of MR4.5 (either (i) detectable disease with <0.0032% BCR-ABL1 IS or (ii) undetectable disease in cDNA with >32,000 ABL1 transcripts in the same volume of cDNA used to test for BCR-ABL1) by 12 months and adverse events of dasatinib (UMIN #000006358). Results Eighty newly diagnosed CML-CP patients were included in this study. All except one patient administered dasatinib 100 mg once daily. One patient was withdrawal before administration of dasatinib. So far, there were 71 patients with 6 months follow-up and 51 patients with 12 months follow-up. The estimated MMR rates were 69.5 % (95%CI, 58.7-80.3 %) by 6 months and 82.7% (95%CI, 73.0-92.4 %) by 12 months. The estimated MR4.5 rates were 27.1 % (95%CI, 16.7-37.5 %) by 6 months and 48.9% (95%CI, 36.0-61.7 %) by 12 months. Only 6 patients were withdrawal because of adverse event (5 patients) and ineffectiveness (1 patient). Conclusion Dasatinib treatment results in higher rates of molecular responses in newly diagnosed CML-CP patients in Japan. Dasatinib as the first-line agent might be acceptable for CML-CP patients because of better clinical efficacy and less toxicity. Disclosures: No relevant conflicts of interest to declare.

ABCB1 Haplotypes Are Associated With Lower P-Gp Activity and Major Molecular Response But Do Not Affect Imatinib Plasma Levels In Chronic Myeloid Leukemia Patients

Blood ◽  
2013 ◽  
Vol 122 (21) ◽  
pp. 3860-3860
Author(s):  
Douglas Vivona ◽  
Luciene Terezina Lima ◽  
Alice C Rodrigues ◽  
Carolina Tosin Bueno ◽  
Cristiane M Gaitani ◽  
...  
Keyword(s):  
Plasma Concentration ◽  
Chronic Myeloid Leukemia ◽  
Functional Activity ◽  
Plasma Levels ◽  
Myeloid Leukemia ◽  
Standard Dose ◽  
Chronic Phase ◽  
Molecular Response ◽  
Wild Type ◽  
Major Molecular Response

Abstract Background Despite the high efficacy of IM treatment in chronic myeloid leukemia (CML), some patients fail to achieve optimal response. Several studies demonstrated that IM is a substrate of membrane transporters, such as ABCB1 (P-gp, MDR1) and variations in protein expression or activity could affect the pharmacokinetics of IM by reducing or increasing its bioavailability. These alterations could be related with single nucleotide polymorphisms in ABCB1 gene. Previous data confirms that haplotypes containing the mutated alleles for ABCB1 c.1236C>T, c.3435C>T and c.2677G>T showed major structural modifications that result in changes in the conformation of the binding sites of P-gp. These modifications could affect the pharmacokinetics of IM. Aim The aim of this study was to evaluate the influence of the different haplotypes for ABCB1 c.1236C>T, c.3435C>T and c.2677TG>T polymorphisms in IM plasma concentration, P-gp activity and IM response from CML patients treated with standard dose of IM (400 mg/day). Methods Twenty eight patients in chronic phase of CML were selected according to the haplotypes for ABCB1 c.1236C>T, c.3435C>T and c.2677G>T polymorphisms at two health centers in São Paulo, Brazil. Ten patients with ABCB1 1236CC/3435CC/2677GG haplotype comprised the wild-type group and 18 carriers of haplotypes with at least one mutated allele in each genotype for three ABCB1 polymorphisms (10 patients with 1236CT/3435CT/2677GT and 8 with 1236TT/3435TT/2677TT) comprised the mutated group. Patients were matched for IM time of use. All patients were in chronic phase of CML, treated with a standard dose of IM (400 mg/day) for a median time of 63.5±12.6 months and with complete cytogenetic response (CCyR). Major molecular response (MMR) was defined as a reduction of BCR-ABL1 transcripts levels to ≤ 0.1% in the peripheral blood standardized on the International scale. Complete molecular response (CMR) was defined as a reduction ≤0.0032% of BCR-ABL1 transcripts levels. Real-Time PCR was performed to evaluate ABCB1 mRNA expression to control gene GAPDH. P-gp functional activity was determinated by rhodamine123 efflux assay. Analysis of P-gp expression and functional activity were performed by flow cytometry. The determination of plasma concentration of IM was performed by capillary electrophoresis. Results Patients without MMR had lower plasma concentration of IM when compared to those that achieved this response (0.51 µg/mL vs. 1.42 µg/mL, P=0.001) but no association was found between the different haplotypes and IM plasma levels or ABCB1 mRNA/P-gp expression. The median of Rh123 efflux in wild-type and mutated groups was 59.1 (54.8 - 69.5) and 38.3 (27.4 - 47.9) (P<0.05), respectively. Patients who did not achieve MMR showed a higher rate of efflux mediated by P-gp compared to individuals who did not achieve this response (64.7% vs. 45.7%, P =0.001). All patients who did not achieve MMR showed efflux above 60%.There was a strong and positive correlation between ABCB1 mRNA expression and P-gp expression (r=0.747, P=0.001). P-gp activity was positive and moderate correlated with BCR-ABL1 transcripts (r=0.570; P=0.001). Conclusion ABCB1 1236CT/3435CT/2677GT and 1236TT/3435TT/2677TT haplotypes are associated with lower P-gp activity and higher frequency of MMR but not with IM plasma concentration in chronic phase CML patients treated with standard-dose of IM (400 mg/day) Disclosures: No relevant conflicts of interest to declare.

scholarly journals Krónikus myeloid leukaemia miatt 2003 és 2019 között a Semmelweis Egyetem Belgyógyászati és Onkológiai Klinikáján kezelt betegek adatainak elemzése

2021 ◽  
Vol 162 (32) ◽  
pp. 1297-1302
Author(s):  
Júlia Weisinger ◽  
Ilona Tárkányi ◽  
Eid Hanna ◽  
Ágnes Kárpáti ◽  
Zsolt Nagy ◽  
...  
Keyword(s):  
Chronic Myeloid Leukemia ◽  
Tyrosine Kinase ◽  
Myeloid Leukaemia ◽  
Tyrosine Kinase Inhibitors ◽  
Myeloid Leukemia ◽  
Kinase Inhibitors ◽  
Kinase Inhibitor ◽  
Molecular Response ◽  
Major Molecular Response ◽  
Treatment Change

Összefoglaló. Bevezetés: A krónikus myeloid leukaemia a diagnosztika fejlődésének és a tirozin-kináz-gátlók bevezetésének köszönhetően az elmúlt évtizedekben kiváló prognózisú betegséggé vált. Célkitűzés: A betegséggel kapcsolatos ismereteink nagy része klinikai vizsgálatokból származik, emiatt kiemelt szerepük van a nem szelektált beteganyagon végzett elemzéseknek. Módszer: Retrospektív elemzésünkben a Semmelweis Egyetem Belgyógyászati és Onkológiai Klinikáján 2003 és 2019 között tirozin-kináz-gátló kezelésben részesült betegek adatait tekintettük át. Eredmények: Klinikánkon összesen 88 beteg részesült terápiában, közülük 73 beteg az analízis időpontjában is kezelés alatt állt. A betegek 5 éves össztúlélése 86%, 5 éves progressziómentes túlélése 70% volt. 9 beteg halt meg, közülük 2 betegnél a halál oka a progrediáló alapbetegség volt. 38 betegnél volt szükség az első vonalban terápiaváltásra, a váltás oka akkor elsősorban az elégtelen terápiás válasz volt. A későbbi terápiaváltásokra elsősorban intolerancia miatt került sor. Az első vonalban a betegek több mint fele major molekuláris választ ért el, a jelenlegi kezelés mellett a betegek 85%-ánál major molekuláris választ detektáltunk. Megbeszélés: Adataink alapján az intézményünkben kezelt betegek túlélése és a betegek által elért terápiás válasz megfelel a nemzetközi adatoknak. Következtetés: Mivel nem válogatott beteganyagról van szó, a kapott eredmények pontosabb képet adhatnak a krónikus myeloid leukaemia tirozin-kináz-gátlóval történt kezelésének eredményeiről. Orv Hetil. 2021; 162(32): 1297–1302. Summary. Introduction: As a result of advances in diagnostic techniques and the introduction of tyrosine kinase inhibitors, the prognosis of chronic myeloid leukemia has improved over the last decades. Objective: Most of our knowledge about chronic myeloid leukemia results from clinical trials, therefore data derived from non-selected patient population is substantial. Method: Data of chronic myeloid leukemia patients treated with tyrosine kinase inhibitors at the Department of Internal Medicine and Oncology, Semmelweis University, between 2003 and 2019 were analysed retrospectively. Results: 88 patients received treatment, 73 patients were on therapy at the time of the analysis. Overall survival at 5 years was 86%, progression-free survival at 5 years was 70%. 9 patients died, 2 of them due to progressive disease. 38 patients needed 2nd line therapy, the main reason of treatment change was failure of therapy. Subsequent treatment modifications were conducted mostly because of intolerance. More than half of the patients on 1st line treatment reached major molecular response and 85% of the patients on treatment at the end of the analysis are in major molecular response. Discussion: Based on our data, survival and therapeutic response of patients in our center are similar to the international results. Conclusion: This analysis provides real-world data about treatment results of chronic myeloid leukemia in the tyrosine kinase inhibitor era. Orv Hetil. 2021; 162(32): 1297–1302.

scholarly journals Efficacy and safety of Bosutinib in Patient with Chronic myeloid leukemia who was intolerant to DASTANIB,NILOTUNIB -Case report

2021 ◽  
pp. 225
Author(s):  
Keyword(s):  
Case Report ◽  
Chronic Myeloid Leukemia ◽  
Myeloid Leukemia ◽  
Kinase Inhibitors ◽  
Chronic Phase ◽  
Symptomatic Treatment ◽  
Molecular Response ◽  
Toxicity Profile ◽  
Efficacy And Safety ◽  
Major Molecular Response

Treatment for Chronic myeloid leukemia has been revolutionized because of availability of different tyrosine kinase inhibitors. Each TKI come with its on toxicity profile as this needs to be taken in account before starting therapy with particular agent in a patient. Most of the adverse effects related to TKI are mild and can be managed by either symptomatic treatment or either by dose reduction. But some patients can become intolerant and to switch to other TKI remains the only option. Bosutinib is currently approved for treatment of chronic phase CML in patients who are either resistant or intolerant to previous TKI. We present a case of 59 year old male patient with CML who was intolerant to Dastanib and Nilotinib but showed excellent hematological and major molecular response to bosutinib

scholarly journals The Use of Statin Enhances Chance of Achieving MR4.5 in Chronic Myeloid Leukemia Patients in Chronic Phase Following Imatinib Therapy

Blood ◽  
2014 ◽  
Vol 124 (21) ◽  
pp. 1804-1804 ◽  
Author(s):  
Dennis Dong Hwan Kim ◽  
Feras Alfraih ◽  
Honggi Lee ◽  
Jeffrey H. Lipton
Keyword(s):  
Overall Survival ◽  
Chronic Myeloid Leukemia ◽  
Treatment Failure ◽  
Myeloid Leukemia ◽  
Response Rate ◽  
Kinase Inhibitor ◽  
Chronic Phase ◽  
Molecular Response ◽  
Statin Group ◽  
Tki Discontinuation

Abstract BACKGROUND: HMG-CoA reducatase inhibitors, or statins, are commonly prescribed medications which improve life expectancy in general population. They are known to improve hypercholesterolemia and decrease the incidence of cardiovascular events including myocardial infarction or stroke, but also suggested for cancer prevention even though the mechanism is not fully elucidated. Recent studies emphasized the potential role of statins in the cancer treatment to increase response rate to 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). The promising result of STIM (STop Imatinb) trial suggested that successful discontinuation of tyrosine kinase inhibitor (TKI) in patients with chronic myeloid leukemia (CML) is possible when patients attain deeper molecular response (defined as 4.5 log reduction or deeper) for 2 years or longer. However, with our current knowledge, there is no known additive intervention facilitates the achievement of MR4.5. We hypothesized that the use of statin improves response rate to tyrosine kinase inhibitor (TKI) therapy in patients with chronic myeloid leukemia (CML), thus increasing MR4.5 achievement and increasing the chance of being attempted TKI discontinuation. METHODS: A total of 503 patients treated with TKI for CML treatment were initially evaluated for the response to TKI therapy with respect to complete cytogenetic response (CCyR), major molecular response (MMR) and molecular response at 4.5 (MR4.5) and statin use. The inclusion criteria confined the patients with chronic phase (CP) treated with imatinib at the dose of 400mg daily, thus excluding 95 patients. Finally, 408 patients were entered into the final analysis. 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. 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, progression free- and overall survival was also evaluated. RESULTS: With a median follow-up duration of 6 years (range 3 months to 14 years), 88 patients (21.3%) were defined as “statin” group. Types of statin includes atorvastatin (n=44, 50%), rosuvastatin (n=26, 30%), simvastatin (n=10, 11%), pravastatin (n=6, 7%) and fluvastatin (n=2, 2%). The MCyR and CCyR achievement was not significantly different between the 2 groups (p=0.769 for MCyR and p=0.091 for CCyR). No difference of CCyR at 12 months was noted: 70.1% in statin vs 62.8% in non-statin group. The statin group showed a higher response rate than non-statin group for MMR (p=0.005) and MR4.5 (p=0.001): 67.3% vs 49.2% for MMR at 18 months; 55.8% vs 41.0% for MR4.5 at 5 years (Figure). Multivariate analysis was successful to confirm the use of statin as an independent clinical factor for improving MR4.5 (HR 1.785, 95% CI [1.260-2.530], p=0.001), but other clinical factors were not identified such as Sokal risk, age, gender or additional cytogenetic abnormalities (ACAs) at presentation. For MMR, the use of statin was also confirmed as independent factor for MMR (HR 1.541 95% [1.015-2.341], p=0.043) in addition to ACAs (HR 0.381, p=0.0038) and high sokal risk (HR 0.687, p=0.042). The use of statin was not found to be associated with improvement in treatment failure (p=0.580), progression free survival (p=0.731) or overall survival (p=0.542) in the present study. CONCLUSION: The use of statin suggested to improve deeper molecular response following imatinib therapy in CML-CP patients, therefore is promising to increase chance of attempt to TKI discontinuation. Statin appears to improve the chance of MR4.5 achievement by 78.5%. Careful interpretation is required and replication study in an independent cohort is strongly warranted to reach a clear conclusion on this promising effect of statin. The use of statin to deepen the molecular response of TKI therapy should be evaluated in the context of clinical trial. Figure 1 Figure 1. Disclosures No relevant conflicts of interest to declare.

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