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Clark SE, Marcum ZA, Radich J, Etzioni R, Basu A. Temporal effect of imatinib adherence on time to remission in chronic myeloid leukemia patients. J Oncol Pharm Pract 2023:10781552231212207. [PMID: 37960888 PMCID: PMC11089074 DOI: 10.1177/10781552231212207] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
INTRODUCTION Adherence to imatinib in chronic myeloid leukemia (CML) patients is estimated to be as low as 70% despite its clinical benefit, and our understanding of the impact of nonadherence in this population is limited. This study presents a novel application of the Alternating Conditional Estimation (ACE) algorithm in newly diagnosed CML patients to map the full dose-response curve (DRC) and determine how the strength of this curve varies over time. METHODS We applied the ACE algorithm alongside a backward elimination procedure to detect the presence of time dependence and nonlinearity in the relationship between imatinib adherence and time-to-remission. An extended Cox model allowing for the flexible modeling of identified effects via unpenalized B-splines was subsequently fit and assessed. RESULTS The substantial improvement in model fit associated with the extended Cox approach suggests that traditional Cox proportional hazards model assumptions do not hold in this setting. Results indicate that the DRC for imatinib is non-linearly increasing, with an attenuated effect above a 74% adherence rate. The strength of this effect on remission varied over time and was strongest in the initial months of treatment, reaching a peak around 90 days post-initiation (log hazard ratio: 2.12, 95% confidence interval: 1.47 to 2.66). CONCLUSION Most patients that achieved remission did so by 4 months (120 days) with consistently high adherence, suggesting that this could be a critical time and duration for realizing treatment benefit and patient monitoring. Findings regarding the relationship between adherence and remission can additionally help guide the design of future studies.
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Affiliation(s)
- Samantha E Clark
- The Comparative Health Outcomes, Policy, and Economics (CHOICE) Institute, University of Washington, Seattle, WA, USA
| | | | - Jerry Radich
- Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Washington School of Medicine, Seattle, WA, USA
| | - Ruth Etzioni
- Fred Hutchinson Cancer Research Center, Seattle, Washington; University of Washington School of Medicine, Seattle, WA, USA
| | - Anirban Basu
- The Comparative Health Outcomes, Policy, and Economics (CHOICE) Institute, University of Washington, Seattle, WA, USA
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Mersin S, Gülük F, Gülcan E, Eşkazan AE. Current and emerging tyrosine kinase inhibitors for the treatment of chronic myeloid leukemia in young adults. Expert Opin Pharmacother 2023; 24:1703-1713. [PMID: 37482425 DOI: 10.1080/14656566.2023.2240702] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Revised: 07/04/2023] [Accepted: 07/21/2023] [Indexed: 07/25/2023]
Abstract
INTRODUCTION Chronic myeloid leukemia (CML) is more common in older adults, but nearly 15-20% of the patients is between 15 and 39 years of age. In this age group, patients may seek clinical care a much later period of the disease and they may have a heavier burden of disease. In addition, young patients with CML may face unique challenges related to their age, such as concerns about health care, fertility, or careers. The current standard of care for CML is the use of tyrosine kinase inhibitors (TKIs), which induce remission in most young patients and can achieve long-term disease control. AREAS COVERED This review summarizes age-specific treatment-related conditions, as well as the effectiveness of TKI therapy in this age group. PubMed, Google Scholar, clinicaltrials.gov and other abstract databases were used while preparing this review. The period of 2001-2023 was chosen as the search window. EXPERT OPINION Although we do not have sufficient data, young adult population has a special importance for TKI treatment. Clinical features, efficacy of treatments, and specific conditions in this age group should attract more attention of clinicians and more intensive studies should be conducted in the future.
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Affiliation(s)
- Sinan Mersin
- Department of Hematology, Dr. Ersin Arslan Training and Research Hospital, Gaziantep, Turkey
| | - Fatih Gülük
- Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Emirhan Gülcan
- Cerrahpaşa Faculty of Medicine, Istanbul University-Cerrahpaşa, Istanbul, Turkey
| | - Ahmet Emre Eşkazan
- Division of Hematology, Department of Internal Medicine, Istanbul University-Cerrahpaşa, Istanbul, Turkey
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Farris KB, Cadwallader T, Farley J, Gatwood K, Mackler E, Gatwood J. Implementation of a model integrating primary and oncology pharmacists' care for patients taking oral anticancer agents (OAA). EXPLORATORY RESEARCH IN CLINICAL AND SOCIAL PHARMACY 2022; 7:100163. [PMID: 35957656 PMCID: PMC9358049 DOI: 10.1016/j.rcsop.2022.100163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2021] [Revised: 06/21/2022] [Accepted: 07/26/2022] [Indexed: 11/28/2022] Open
Abstract
Improvements in chronic myeloid leukemia (CML), chronic lymphocytic leukemia (CLL), and multiple myeloma (MM) treatment options have increased the 5-year survival rates for patients with these hematologic malignancies. In addition to cancer management, these patients may need help to manage multiple chronic conditions (MCC). The overall objective of this study is to examine the impact and implementation of a model that coordinates care between oncology and primary care pharmacists for people taking an oral anti-cancer agent (OAAs) and medications for comorbid chronic conditions. This is a multi-center, prospective, single-arm pilot study that will recruit up to 40 patients from Michigan Medicine and Vanderbilt University Medical Center (VUMC). Eligible participants will be 18 years of age or older, prescribed an OAA, have a diagnosis of either CML, CLL or MM, and be diagnosed with and taking medication for at least two specified chronic conditions. The Pharmacists Coordinated Care Oncology Model (PCOM) is a two-month intervention that builds upon current pharmacist clinical responsibilities. Generally, participants will complete a patient-reported outcome measure at 2 and 6 weeks post-OAA initiation that is sent to their oncology pharmacist, and they will also receive a comprehensive medication review at week 4 from a primary care pharmacist for their chronic medications. The pharmacists will communicate about the results via electronic medical record (EMR) and intervene if necessary. The primary endpoints are (1) dose-adjusted OAA proportion of days covered (PDC), and (2) PDC for chronic condition medications. PDCs will be determined via prescription records. The association of OAA and chronic medication PDCs will be quantified via correlation and chi-squared tests. The association between symptom experience and OAA adherence will be examined via correlation analyses. For implementation, characteristics of patient participants, feasibility, acceptability, adoption, fidelity, and trialability will be described. Data will be collected via EMR and pharmacist and patient interviews. Median/IQR for acceptability, adoption and fidelity will be reported, and patient interviews will be analyzed using a grounded theory approach and pharmacist interviews will be analyzed using thematic analyses.
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Kim Y, Go TH, Jang J, Lee JB, Lim ST, Shim KY, Lee JI, Kong JH. Survival impact of adherence to tyrosine kinase inhibitor in chronic myeloid leukemia. Korean J Intern Med 2021; 36:1450-1458. [PMID: 34742178 PMCID: PMC8588973 DOI: 10.3904/kjim.2021.158] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 07/21/2021] [Indexed: 12/04/2022] Open
Abstract
BACKGROUND/AIMS Adherence to tyrosine kinase inhibitors (TKIs) has become a critical aspect of care in chronic myeloid leukemia (CML). We aimed to examine the association of TKI adherence with overall survival (OS) outcomes in Korean patients diagnosed with CML and treated with TKIs using data from the National Health Information Database. METHODS This study included 2,870 CML patients diagnosed between 2005 and 2013. Drug adherence was evaluated according to the medication possession ratio (MPR) and classified as high adherence (i.e., MPR ≥ 0.95 [upper 50%]), moderate adherence (i.e., MPR ≥ 0.68 and < 0.95 [middle 25%]), and low adherence (i.e., MPR < 0.68 [lower 25%]). RESULTS The median MPR was 0.95 (range, 0 to 4.67). Male sex (p = 0.003), age < 70 years (p < 0.001), high income (≥ 30%, p < 0.001), and maintaining frontline TKI (< 0.001) were associated with better adherence. Adherence to dasatinib was the lowest (vs. imatinib or nilotinib, p < 0.001). Compared with high MPR patients, those with moderate MPR (hazard ratio [HR], 4.90; 95% confidence interval [CI], 3.87 to 6.19; p < 0.001) and low MPR (HR, 11.6; 95% CI, 9.35 to 14.42; p < 0.001) had poorer OS. CONCLUSION Adherence to TKI treatment is an important factor predicting survival outcomes in Korean CML patients. Male sex, age < 70 years, high income, and maintaining frontline TKI are associated with high adherence to TKI. Thus, those without these characteristics should be closely monitored for treatment adherence.
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Affiliation(s)
- Yundeok Kim
- Division of Hematology-Oncology, Department of Internal Medicine, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Tae-Hwa Go
- Department of Biostatics, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Jaeyeon Jang
- Division of Hematology-Oncology, Department of Internal Medicine, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Jii Bum Lee
- Division of Hematology-Oncology, Department of Internal Medicine, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Seung Taek Lim
- Division of Hematology-Oncology, Department of Internal Medicine, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Kwang Yong Shim
- Division of Hematology-Oncology, Department of Internal Medicine, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Jong In Lee
- Division of Hematology-Oncology, Department of Internal Medicine, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea
| | - Jee Hyun Kong
- Division of Hematology-Oncology, Department of Internal Medicine, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, Wonju, Korea
- Cancer of Evidence Based Medicine, Institute of Convergence Science, Yonsei University, Seoul, Korea
- Correspondence to Jee Hyun Kong, M.D. Division of HematologyOncology, Department of Internal Medicine, Wonju Severance Christian Hospital, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju 26426, Korea Tel: +82-33-741-0511 Fax: +82-33-741-3308 E-mail:
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Heiney SP, Sorrell M, Sheng J, Adams SA, Nelson K, Nguyen LA, Edwards A, Wickersham KE. Interventions to Improve Adherence to Tyrosine Kinase Inhibitors in Chronic Myeloid Leukemia: A Systematic Review. Am J Clin Oncol 2021; 44:291-298. [PMID: 33867480 DOI: 10.1097/coc.0000000000000818] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Lack of adherence to tyrosine kinase inhibitors (TKIs) is a significant problem resulting in incomplete cytogenetic response and increased mortality in patients with chronic myeloid leukemia (CML). Few studies have been conducted on interventions to improve adherence. The authors conducted a systematic review to explore studies that examined the impact of strategies to improve TKI adherence among individuals with CML. METHODS The first 2 authors completed a systematic literature review according to the guidelines in Preferred Reporting Items for Systematic Review and Meta-Analysis (PRISMA). Studies (n=2633) conducted between 1980 and 2019 were identified through 3 databases and examined for inclusion/exclusion criteria. RESULTS Fourteen studies were identified which met the eligibility criteria. The studies only examined adherence to imatinib, dasatinib, or nilotinib. Ten of the 14 used large data sets (commercial health insurance plans or Surveillance Epidemiology and End Results [SEER] data) for analysis. The majority of the studies used a cohort design. Adherence was defined and measured in a variety of ways with most studies using 80% or higher as adequate adherence. Strategies not focused on health care costs used a multidisciplinary team approach. CONCLUSION Development of evidence to improve treatment adherence to TKIs for CML have relied on large data sets rather than prospective trials. Current studies lack patient focused interventions.
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MESH Headings
- Health Care Costs
- Humans
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/drug therapy
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/economics
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/enzymology
- Leukemia, Myelogenous, Chronic, BCR-ABL Positive/psychology
- Medication Adherence/psychology
- Medication Adherence/statistics & numerical data
- Prognosis
- Protein Kinase Inhibitors/economics
- Protein Kinase Inhibitors/therapeutic use
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Affiliation(s)
| | - McKenzie Sorrell
- Prisma Health-Midlands/USC School of Medicine Columbia, Internal Medicine Residency Program
- Medical University of South Carolina, Charleston, SC
| | | | - Swann A Adams
- College of Nursing
- Department of Epidemiology & Biostatistics, Arnold School of Public Health
| | | | | | - Amy Edwards
- Thomas Cooper Library, University of South Carolina
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Santoleri F, Ranucci E, La Barba G, Colasanto I, Scaldaferri M, Cattel F, Federici F, Rossi C, Di Biagio K, Scortechini AR, Musicco F, Torquati G, Frazzetto A, Vozza A, de Rosa C, Lanzillo R, Monteverde M, Luciano L, Pane F, Pasquazi A, Celeste MG, Cantonetti M, Franceschini L, Rizzo M, Costantini A. Adherence, persistence and efficacy of dasatinib and nilotinib in the treatment of patients resistant or intolerant to imatinib with chronic myeloid leukemia in chronic phase: an Italian multicenter study over two years in real life. Curr Med Res Opin 2021; 37:477-481. [PMID: 33459083 DOI: 10.1080/03007995.2021.1876006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
BACKGROUND The use of dasatinib and nilotinib in the treatment of patients with chronic myeloid leukemia represents a valid therapeutic option for patients resistant or intolerant to imatinib. In this multicentre study, adherence, persistence and efficacy in real life over two years of treatment were evaluated. MATERIALS AND METHODS Adherence to treatment was calculated as the ratio between the dose received and the prescribed dose. The dose received was calculated using pharmacy refill data. The persistence with treatment was calculated as the difference between the end and the beginning of the treatment. Efficacy was assigned as Progression-Free Survival (PFS) and Events-Free Survival (EFS) and represented through the Kaplan-Meier curve. RESULTS The number of patients analysed was 117, 70 treated with dasatinib and 47 with nilotinib. Adherence to treatment for dasatinib and nilotinib at two years was 0.91 and 0.82 respectively. Persistence at two years was 77% while the PFS was 92% for both drugs in the study. CONCLUSION Adherence to the treatment calculated over two years showed a superiority of dasatinib over nilotinib. Nevertheless, the efficacy in terms of PFS and EFS is superimposable between the two drugs in the study.
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Affiliation(s)
| | - Elena Ranucci
- Department Pharmacist, Hematological Oncology Department, Pescara General Hospital, Pescara, Italy
| | - Gaetano La Barba
- Hematologist, Hematological Oncology Department, Pescara General Hospital, Pescara, Italy
| | - Irene Colasanto
- Hospital pharmacist, Azienda Ospedaliero Universitaria Città della Salute e della Scienza di Torino, Torino, Italy
| | - Matilde Scaldaferri
- Hospital pharmacist, Azienda Ospedaliero Universitaria Città della Salute e della Scienza di Torino, Torino, Italy
| | - Francesco Cattel
- Hospital pharmacist, Azienda Ospedaliero Universitaria Città della Salute e della Scienza di Torino, Torino, Italy
| | | | | | - Katiuscia Di Biagio
- Environmental Epidemiology Unit - Regional Environmental Protection Agency of Marche, Ancona, Italy
| | - Anna Rita Scortechini
- Hematologist, Hematology Unit, Azienda Ospedaliero Universitaria Ospedali Riuniti, Ancona, Italy
| | - Felice Musicco
- Hospital Pharmacist at Regina Elena - San Gallicano cancer and dermatological Institute, Rome, Italy
| | - Giancarlo Torquati
- Hospital Pharmacist at Regina Elena - San Gallicano cancer and dermatological Institute, Rome, Italy
| | - Angela Frazzetto
- Hospital Pharmacist at Regina Elena - San Gallicano cancer and dermatological Institute, Rome, Italy
| | - Antonietta Vozza
- Hospital pharmacist, Azienda Ospedaliera Universitaria "Federico II", Napoli, Italy
| | - Caterina de Rosa
- Hospital pharmacist, Azienda Ospedaliera Universitaria "Federico II", Napoli, Italy
| | - Rosaria Lanzillo
- Hospital pharmacist, Azienda Ospedaliera Universitaria "Federico II", Napoli, Italy
| | - Maria Monteverde
- Biologist, Department of Clinical Medicine and Surgery, Federico II University Medical School, Napoli, Italy
| | - Luigia Luciano
- Hematologist, Department of Clinical Medicine and Surgery, Federico II University Medical School, Napoli, Italy
| | - Fabrizio Pane
- Hematologist, Department of Clinical Medicine and Surgery, Federico II University Medical School, Napoli, Italy
| | - Arianna Pasquazi
- Hospital pharmacist, Policlinico Tor Vergata PTV Foundation, Roma, Italy
| | | | - Maria Cantonetti
- Hematologist, Unit of Lymphoproliferative Disorders, Policlinico Tor Vergata PTV Foundation, Roma, Italy
| | - Luca Franceschini
- Hematologist, Unit of Lymphoproliferative Disorders, Policlinico Tor Vergata PTV Foundation, Roma, Italy
| | - Manuela Rizzo
- Hematologist, Unit of Lymphoproliferative Disorders, Policlinico Tor Vergata PTV Foundation, Roma, Italy
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Tan BK, Bee PC, Chua SS, Chen LC. Monitoring and Improving Adherence to Tyrosine Kinase Inhibitors in Patients with Chronic Myeloid Leukemia: A Systematic Review. Patient Prefer Adherence 2021; 15:2563-2575. [PMID: 34819724 PMCID: PMC8608409 DOI: 10.2147/ppa.s269355] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/04/2021] [Accepted: 11/05/2021] [Indexed: 12/12/2022] Open
Abstract
PURPOSE Suboptimal adherence to tyrosine kinase inhibitors (TKIs) is a widely recognized issue compromising the disease control and survival of patients with chronic myeloid leukemia (CML). A recently published review by Heiney et al reported inconclusive findings on the effects of a broad range of adherence enhancing interventions. The current systematic review aimed to identify studies that evaluated adherence-enhancing interventions implemented by healthcare professionals and determine their effect on CML patients' medication adherence and clinical outcomes. METHODS A systematic literature search was performed in 5 databases for articles published between 2002 and 2021. Studies that compared adherence enhancing interventions implemented by healthcare professionals with a comparison group were included. Relevant data on study characteristics were extracted. Medication adherence and clinical outcomes between intervention and control arms were compared. RESULTS Nine studies were included in two randomised controlled trials, four cohort studies, and three before-and-after comparison studies. All the included studies incorporated complex interventions, including intensive education or consultation with pharmacists, nurses or multidisciplinary team, in combination with one or more other strategies such as structured follow-up, written materials or video, psychotherapy, medication reminder or treatment diary, with the overall goal of monitoring and improving TKI adherence. Most (7 out of 9) studies demonstrated significantly better adherence to TKIs in the intervention group than the comparison group. The relative proportion of participants who adhered to TKIs ranged from 1.22 to 2.42. The improvement in the rate of TKI doses taken/received ranged from 1.5% to 7.1%. Only one study showed a significant association between intervention and clinical outcomes, with a 22.6% higher major molecular response rate and improvement in 6 out of 20 subscales of health-related quality-of-life. CONCLUSION Complex interventions delivered by healthcare professionals showed improvement in adherence to TKIs in CML patients. Further studies are required to clarify the cost-effectiveness of adherence-enhancing interventions.
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Affiliation(s)
- Bee Kim Tan
- School of Pharmacy, Faculty of Health and Medical Sciences, Taylor’s University, Subang Jaya, Selangor, 47500, Malaysia
- Correspondence: Bee Kim Tan School of Pharmacy, Faculty of Health and Medical Sciences, Taylor’s University, Subang Jaya, Selangor, 47500, MalaysiaTel +6 03 5629 5000 Email
| | - Ping Chong Bee
- Department of Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur, 50603, Malaysia
| | - Siew Siang Chua
- School of Pharmacy, Faculty of Health and Medical Sciences, Taylor’s University, Subang Jaya, Selangor, 47500, Malaysia
| | - Li-Chia Chen
- Centre for Pharmacoepidemiology and Drug Safety, Division of Pharmacy and Optometry, School of Health Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester Academic Health Science Centre, Manchester, M13 9PT, UK
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Deininger MW, Shah NP, Altman JK, Berman E, Bhatia R, Bhatnagar B, DeAngelo DJ, Gotlib J, Hobbs G, Maness L, Mead M, Metheny L, Mohan S, Moore JO, Naqvi K, Oehler V, Pallera AM, Patnaik M, Pratz K, Pusic I, Rose MG, Smith BD, Snyder DS, Sweet KL, Talpaz M, Thompson J, Yang DT, Gregory KM, Sundar H. Chronic Myeloid Leukemia, Version 2.2021, NCCN Clinical Practice Guidelines in Oncology. J Natl Compr Canc Netw 2020; 18:1385-1415. [PMID: 33022644 DOI: 10.6004/jnccn.2020.0047] [Citation(s) in RCA: 127] [Impact Index Per Article: 31.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Chronic myeloid leukemia (CML) is defined by the presence of Philadelphia chromosome (Ph) which results from a reciprocal translocation between chromosomes 9 and 22 [t(9;22] that gives rise to a BCR-ABL1 fusion gene. CML occurs in 3 different phases (chronic, accelerated, and blast phase) and is usually diagnosed in the chronic phase. Tyrosine kinase inhibitor therapy is a highly effective first-line treatment option for all patients with newly diagnosed chronic phase CML. This manuscript discusses the recommendations outlined in the NCCN Guidelines for the diagnosis and management of patients with chronic phase CML.
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Affiliation(s)
| | - Neil P Shah
- UCSF Helen Diller Family Comprehensive Cancer Center
| | - Jessica K Altman
- Robert H. Lurie Comprehensive Cancer Center of Northwestern University
| | | | | | - Bhavana Bhatnagar
- The Ohio State University Comprehensive Cancer Center - James Cancer Hospital and Solove Research Institute
| | | | | | | | | | | | - Leland Metheny
- Case Comprehensive Cancer Center/University Hospitals Seidman Cancer Center and Cleveland Clinic Taussig Cancer Institute
| | | | | | - Kiran Naqvi
- The University of Texas MD Anderson Cancer Center
| | - Vivian Oehler
- Fred Hutchinson Cancer Research Center/Seattle Cancer Care Alliance
| | - Arnel M Pallera
- St. Jude Children's Research Hospital/The University of Tennessee Health Science Center
| | | | - Keith Pratz
- Abramson Cancer Center at the University of Pennsylvania
| | - Iskra Pusic
- Siteman Cancer Center at Barnes-Jewish Hospital and Washington University School of Medicine
| | | | - B Douglas Smith
- The Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
| | | | | | | | | | - David T Yang
- University of Wisconsin Carbone Cancer Center; and
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Boons CCLM, Timmers L, Janssen JJWM, Westerweel PE, Blijlevens NMA, Smit WM, Bartelink IH, Wilschut JA, Swart EL, Hendrikse NH, Hugtenburg JG. Response and Adherence to Nilotinib in Daily practice (RAND study): an in-depth observational study of chronic myeloid leukemia patients treated with nilotinib. Eur J Clin Pharmacol 2020; 76:1213-1226. [PMID: 32488333 PMCID: PMC7419465 DOI: 10.1007/s00228-020-02910-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Accepted: 05/22/2020] [Indexed: 12/27/2022]
Abstract
Introduction This comprehensive observational study aimed to gain insight into adherence to nilotinib and the effect of (non)adherence on exposure (Cmin) and treatment outcomes. Methods Chronic myeloid leukemia (CML) patients using nilotinib were followed for 12 months. Adherence was measured by Medication Event Monitoring System (MEMS), pill count, and Medication Adherence Report Scale (MARS-5). Nilotinib Cmin and patient-reported outcomes (i.e., quality of life, side effects, beliefs, satisfaction) were measured at baseline, 3, 6, and 12 months. Results Sixty-eight patients (57.5 ± 15.0 years, 49% female) participated. Median adherence to nilotinib (MEMS and pill count) was ≥ 99% and adherence < 90% was rare. Self-reported nonadherence (MARS-5) increased in the first year of treatment to a third of patients. In line with the strong beliefs in the necessity of taking nilotinib, forgetting to take a dose was more prevalent than intentionally adjusting/skipping doses. Nilotinib Cmin were generally above the therapeutic target in 95% of patients. Patients reported a variety of side effects, of which fatigue was most frequent. The mean Cmin was higher in patients who reported severe itching and fatigue. The overall 1-year MMR rate ranged from 47 to 71%. Conclusion Substantial nonadherence (< 90%) to nilotinib was rare and nilotinib Cmin were generally above the therapeutic target. Lack of response in our group of patients was not related to nonadherence or inadequate Cmin. Nevertheless, a considerable number of patients experienced difficulties in adhering to the twice daily fasted dosing regimen, emphasizing the importance of continuous support of medication adherence in CML. Clinical trial registration NTR3992 (Netherlands Trial Register, www.trialregister.nl) Electronic supplementary material The online version of this article (10.1007/s00228-020-02910-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Christel C L M Boons
- Department of Clinical Pharmacology and Pharmacy, Amsterdam UMC, Vrije Universiteit Amsterdam, Cancer Centre Amsterdam, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands. .,Amsterdam Public Health Research Institute, Amsterdam UMC, Vrije Universiteit Amsterdam, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands.
| | - Lonneke Timmers
- Department of Clinical Pharmacology and Pharmacy, Amsterdam UMC, Vrije Universiteit Amsterdam, Cancer Centre Amsterdam, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands.,Amsterdam Public Health Research Institute, Amsterdam UMC, Vrije Universiteit Amsterdam, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands
| | - Jeroen J W M Janssen
- Department of Hematology, Amsterdam UMC, Vrije Universiteit Amsterdam, Cancer Centre Amsterdam, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands
| | - Peter E Westerweel
- Department of Hematology, Albert Schweitzer Ziekenhuis, Albert Schweitzerplaats 25, 3318 AT, Dordrecht, The Netherlands
| | - Nicole M A Blijlevens
- Department of Hematology, Radboudumc, Geert Grooteplein Zuid 10, 6525 GA, Nijmegen, The Netherlands
| | - Willem M Smit
- Department of Hematology, Medisch Spectrum Twente, Koningsplein 1, 7512 KZ, Enschede, The Netherlands
| | - Imke H Bartelink
- Department of Clinical Pharmacology and Pharmacy, Amsterdam UMC, Vrije Universiteit Amsterdam, Cancer Centre Amsterdam, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands
| | - Janneke A Wilschut
- Amsterdam Public Health Research Institute, Amsterdam UMC, Vrije Universiteit Amsterdam, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands
| | - Eleonora L Swart
- Department of Clinical Pharmacology and Pharmacy, Amsterdam UMC, Vrije Universiteit Amsterdam, Cancer Centre Amsterdam, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands
| | - N Harry Hendrikse
- Department of Clinical Pharmacology and Pharmacy, Amsterdam UMC, Vrije Universiteit Amsterdam, Cancer Centre Amsterdam, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands.,Department of Radiology and Nuclear Medicine, Amsterdam UMC, Vrije Universiteit Amsterdam, Cancer Centre Amsterdam, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands
| | - Jacqueline G Hugtenburg
- Department of Clinical Pharmacology and Pharmacy, Amsterdam UMC, Vrije Universiteit Amsterdam, Cancer Centre Amsterdam, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands.,Amsterdam Public Health Research Institute, Amsterdam UMC, Vrije Universiteit Amsterdam, De Boelelaan 1117, 1081 HV, Amsterdam, The Netherlands
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10
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Evaluation of Medication Adherence and Pharmacokinetics of Dasatinib for Earlier Molecular Response in Japanese Patients With Newly Diagnosed Chronic Myeloid Leukemia: A Pilot Study. Ther Drug Monit 2020; 41:575-581. [PMID: 31008998 DOI: 10.1097/ftd.0000000000000639] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Tyrosine kinase inhibitors markedly improve the survival for patients with chronic myeloid leukemia (CML). However, a decrease in adherence leads to undesired therapeutic outcomes. In this study, the relationships among adherence, pharmacokinetics, response, and adverse effects for dasatinib treatment were prospectively investigated. METHODS This study was a prospective cohort study of patients with newly diagnosed CML at 4 general hospitals and 1 university hospital. Patients started to receive dasatinib 100 mg once daily. A Medication Event Monitoring System was used to assess medication adherence and the medication possession ratio during the 12 months. Plasma concentrations of dasatinib were measured using liquid chromatograph-tandem mass spectrometry (LC-MS/MS), and therapy responses were assessed at 3, 6, and 12 months after treatment. RESULTS Ten patients were included. An extremely high medication adherence for dasatinib was observed; the median medication possession ratio was 99.4%. All 9 CML patients with breakpoints in the major BCR-ABL achieved major molecular response (MMR; major BCR-ABL transcript level below 0.1% on the International Scale) within 12 months, and 5 achieved MMR within 6 months. The receiver operating characteristic curve analysis revealed that the cutoff value for the dasatinib area under the concentration-time curve was 336.1 ng × h/mL (accuracy 88.9%, sensitivity 80.0%, specificity 100%, and receiver operating characteristic curve-area under the concentration-time curve 0.800) for achieving MMR within 6 months. Two patients had interrupted dasatinib treatment because of pleural effusion and diarrhea with intestinal edema, respectively. These edematous adverse events developed after plasma dasatinib Cmin surpassed 3.0 ng/mL. CONCLUSIONS A Medication Event Monitoring System was applied for the direct evaluation of oral dasatinib adherence for the first time, and the clinical effect of dasatinib was investigated under the strict monitoring of patient adherence. Although this study had a small sample size, the plasma concentration monitoring of dasatinib is considered to be useful to predict an earlier molecular response with fewer edematous adverse events.
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Dashputre AA, Gatwood KS, Gatwood J. Medication Adherence, Health Care Utilization, and Costs Among Patients Initiating Oral Oncolytics for Multiple Myeloma or Chronic Lymphocytic Leukemia/Small Lymphocytic Lymphoma. J Manag Care Spec Pharm 2020; 26:186-196. [PMID: 32011965 PMCID: PMC10391134 DOI: 10.18553/jmcp.2020.26.2.186] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Oral oncolytic therapies have improved survival in hematologic cancers, such as chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL) and multiple myeloma (MM), which are now being managed like chronic conditions. However, compared with other cancers, there is a lack of studies assessing adherence, health care resource utilization, and costs in patients with these cancers. OBJECTIVE To assess factors associated with adherence to oral oncolytic therapies, health care utilization, and costs in patients with CLL/SLL or MM. METHODS A retrospective database study was conducted using the IBM MarketScan Commercial Claims and Medicare Supplement databases. Adults (aged ≥ 18 years) diagnosed with and prescribed an oral oncolytic for CLL/SLL (ibrutinib or idelalisib) or MM (thalidomide, lenalidomide, or pomalidomide) between 2013 and 2016 and with continuous eligibility 6 months before and 12 months after oral oncolytic initiation were identified. Adherence to oral oncolytics was measured using the proportion of days covered (PDC) metric. Multiple linear regression and multivariable logistic regression were used to identify adherence predictors. Count models assessed the relationship between adherence and resource utilization, and generalized linear models assessed the relationship between adherence and health care costs. RESULTS A total of 701 and 2,385 patients were identified with CLL/SLL or MM, respectively. Mean PDC (SD) for CLL/SLL and MM patients was 75.3 (22.5) and 57.6 (26.5), respectively. For CLL/SLL patients, those aged ≥ 65 years (beta [B] = -4.00) had lower medication use. Among MM patients, multiple predictors of higher medication use emerged: aged ≥ 65 years (B = 3.44), higher than average outpatient resource utilization (B = 3.53), insurance plan other than preferred provider organization (PPO; B = -2.58), previous cancer therapy (B = -2.81), higher number of concurrent unique therapeutic classes (B = -0.35), and higher comorbidity burden (B = -2.55). Patients with CLL/SLL and enrolled in plans other than a PPO were more likely to be adherent (OR = 1.41, 95% CI = 1.01-1.98), whereas patients who were aged ≥ 65 years, were residents of the southern United States, and had visited the emergency department in the baseline period were less likely to be adherent. For MM patients, those aged ≥ 65 years (OR = 1.68, 95% CI = 1.38-2.04) and with higher than average outpatient services utilization (OR = 1.24, 95% CI = 1.01-1.52) were more likely to be adherent, whereas those enrolled in plans other than a PPO, previously treated with cancer therapy, and with higher comorbidity burden were less likely to be adherent. In both cohorts, adherent patients had significantly lower odds of health care utilization and incurred lower medical costs, but higher prescription costs, following oncolytic initiation; however, total costs were not significantly lower in those adherent. CONCLUSIONS Factors were identified that influenced adherence at the patient, treatment, and health system levels. These factors can be used to identify patients requiring interventions for improving medication-taking behavior and associated health care burden. DISCLOSURES This study received no outside funding. Dashputre was recently employed by Novartis; K. Gatwood has received speaker fees from Jazz Pharmaceuticals; and J. Gatwood has received research funding from Merck & Co. and GlaxoSmithKline, unrelated to this study..
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Affiliation(s)
- Ankur A. Dashputre
- Institute for Health Outcomes and Policy, College of Graduate Health Sciences, University of Tennessee Health Science Center, Memphis
| | | | - Justin Gatwood
- College of Pharmacy, University of Tennessee Health Science Center, Nashville
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Fachi MM, Tonin FS, Leonart LP, Aguiar KS, Lenzi L, Figueiredo BC, Fernandez-Llimos F, Pontarolo R. Comparative efficacy and safety of tyrosine kinase inhibitors for chronic myeloid leukaemia: A systematic review and network meta-analysis. Eur J Cancer 2018; 104:9-20. [DOI: 10.1016/j.ejca.2018.08.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 08/17/2018] [Accepted: 08/21/2018] [Indexed: 12/21/2022]
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Hefner J, Csef EJ, Kunzmann V. Adherence and Coping Strategies in Outpatients With Chronic Myeloid Leukemia Receiving Oral Tyrosine Kinase Inhibitors. Oncol Nurs Forum 2017; 44:E232-E240. [PMID: 29052661 DOI: 10.1188/17.onf.e232-e240] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
PURPOSE/OBJECTIVES To assess adherence and coping strategies in outpatients with chronic myeloid leukemia (CML) on oral tyrosine kinase inhibitors (TKIs).
. DESIGN Prospective, descriptive.
. SETTING An interdisciplinary oncology outpatient clinic in Germany.
. SAMPLE 35 outpatients with CML on oral TKIs.
. METHODS Adherence and coping strategies were assessed with questionnaires. Clinical data were extracted from medical charts.
. MAIN RESEARCH VARIABLES Adherence rates, main coping strategies, and frequency and contents of single coping strategies.
. FINDINGS 18 patients showed adherence according to the applied screening instrument. Main coping strategies were spirituality and search for meaning. The two single items most frequently specified were adhering to medical instructions and trusting in the medical personnel involved.
. CONCLUSIONS The low adherence rate of 51% most likely resulted from using the Basel Assessment of Adherence Scale as the questionnaire of choice. The relevance of spirituality and search for meaning as main coping strategies has not been shown previously in outpatients with CML. Most patients wish to obey medical instructions accurately and put trust in their oncologists; this introduces a resource that should gain relevance considering the increasing number of oral anticancer drugs.
. IMPLICATIONS FOR NURSING Nurses are encouraged to routinely assess adherence and spiritual needs in outpatients with CML. Spirituality and search for meaning represent pivotal coping strategies in this group, which has an excellent prognosis. Oncology nurses may help provide tailored support, thereby ameliorating care for these patients.
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Lim YM, Eng WL, Chan HK. Understanding and Challenges in Taking Tyrosine Kinase Inhibitors among Malaysian Chronic Myeloid Leukemia Patients: A Qualitative Study. Asian Pac J Cancer Prev 2017; 18:1925-1930. [PMID: 28749622 PMCID: PMC5648400 DOI: 10.22034/apjcp.2017.18.7.1925] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Background: In Malaysia, the treatment for chronic myeloid leukemia (CML) has long been delivered under the Malaysian Patient Assistance Program (MYPAP), but research on identifying factors contributing to non-adherence to tyrosine kinase inhibitors (TKIs) is still limited. The current study explored understanding and challenges of Malaysian CML patients in taking imatinib and nilotinib. Methods: Semi-structured, face-to-face interviews were conducted with 13 CML patients receiving treatment at a public tertiary care center, and were analyzed using the content analysis approach. Results: The patients generally demonstrated inadequate knowledge, particularly of the natural history and staging of CML, the function of TKIs, and the methods used for monitoring the effectiveness of treatment. A number of them also had experiences of withholding, skipping or altering the treatment, mainly due to the life-disturbing adverse drug effects (ADRs), forgetfulness, and religious and social issues. Besides, most of them were found having limited skills in managing the ADRs, and not using prompts as reminders to take the medications. Furthermore, even though nilotinib was generally perceived as better tolerated as compared with imatinib, the inconvenience caused by the need to take it twice daily and on an empty stomach was constantly highlighted by the patients. Conclusion: While TKIs are widely used for CML treatment in Malaysia, the findings have revealed a lack of patient education and awareness, which warrants an integrated plan to reinforce medication adherence.
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Affiliation(s)
- Yik Ming Lim
- Pharmacy Department, Sultanah Bahiyah Hospital, Alor Setar, Malaysia.
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Sacha T, Góra-Tybor J, Wąsak-Szulkowska E, Kyrcz-Krzemień S, Mędraś E, Becht R, Bober G, Kotowska A, Wącław J, Hellmann A. Quality of Life and Adherence to Therapy in Patients With Chronic Myeloid Leukemia Treated With Nilotinib as a Second-Line Therapy: A Multicenter Prospective Observational Study. CLINICAL LYMPHOMA MYELOMA & LEUKEMIA 2017; 17:283-295. [PMID: 28185798 DOI: 10.1016/j.clml.2017.01.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Accepted: 01/03/2017] [Indexed: 11/29/2022]
Abstract
INTRODUCTION The aim of this study was to evaluate quality of life (QOL) and adherence to the therapy in patients with chronic myeloid leukemia in chronic phase treated with nilotinib as second-line therapy. PATIENTS AND METHODS A multicenter, prospective, observational trial with 6 time points was conducted; 177 patients were recruited in 23 centers in Poland who were treated with nilotinib as second-line therapy because of the ineffectiveness or intolerance of their previous therapy. QOL was evaluated with the standard European Organization for Research and Treatment of Cancer Core Quality of Life questionnaire. Adherence to the therapy was assessed using the 4-item Morisky Medication Adherence Scale by patients and their physicians. RESULTS The average QOL in patients who completed the study was significantly higher during the last visit (69.4 ± 17.4) than at the start of the study (59.1 ± 18.8; P < .001). At their first visit, 120 (83.2%) patients assessed themselves as highly compliant and 135 (93.4%) at the fifth visit. Low-compliance patients represented 3 (1.7% of the total) during visit 1; none of the patients self-assessed as low compliance since the fourth visit. At the first visit 151 (85.3%) patients were categorized by their physicians as highly compliant and 138 (96.0%) during the last 3 visits. Patients' and their physicians' assessments were significantly correlated. CONCLUSION The QOL among patients receiving nilotinib administered as second-line therapy was very good and adherence to the treatment was high. The efficacy and safety of the drug were confirmed in the real-life setting.
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Affiliation(s)
- Tomasz Sacha
- Department of Hematology, Jagiellonian University Hospital, Kraków, Poland.
| | | | | | - Sławomira Kyrcz-Krzemień
- Department of Hematology and Bone Marrow Transplantation, Silesian Medical University, Katowice, Poland
| | - Ewa Mędraś
- Department of Hematology, Malignant Blood Diseases and Bone Marrow Transplantation, Wroclaw Medical University, Wrocław, Poland
| | - Rafał Becht
- Department of Hematology, Pomeranian Medical University in Szczecin, Szczecin, Poland
| | - Grażyna Bober
- Department of Hematology and Bone Marrow Transplantation, Silesian Medical University, Katowice, Poland
| | | | - Joanna Wącław
- Department of Hematology, Jagiellonian University Hospital, Kraków, Poland
| | - Andrzej Hellmann
- Department of Hematology and Transplantology, Gdansk Medical University, Gdańsk, Poland
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De Marchi F, Medeot M, Fanin R, Tiribelli M. How could patient reported outcomes improve patient management in chronic myeloid leukemia? Expert Rev Hematol 2016; 10:9-14. [DOI: 10.1080/17474086.2017.1262758] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Federico De Marchi
- Division of Hematology and BMT, Department of Experimental and Clinical Medical Sciences, Azienda Sanitaria Universitaria Integrata di Udine, Udine, Italy
| | - Marta Medeot
- Division of Hematology and BMT, Department of Experimental and Clinical Medical Sciences, Azienda Sanitaria Universitaria Integrata di Udine, Udine, Italy
| | - Renato Fanin
- Division of Hematology and BMT, Department of Experimental and Clinical Medical Sciences, Azienda Sanitaria Universitaria Integrata di Udine, Udine, Italy
| | - Mario Tiribelli
- Division of Hematology and BMT, Department of Experimental and Clinical Medical Sciences, Azienda Sanitaria Universitaria Integrata di Udine, Udine, Italy
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Smith BD, Liu J, Latremouille-Viau D, Guerin A, Fernandez D, Chen L. Treatment patterns, overall survival, healthcare resource use and costs in elderly Medicare beneficiaries with chronic myeloid leukemia using second-generation tyrosine kinase inhibitors as second-line therapy. Curr Med Res Opin 2016; 32:817-27. [PMID: 26743563 DOI: 10.1185/03007995.2016.1140030] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Objective Though the median age at diagnosis is 64 years, few studies focus on elderly (≥65 years) patients with chronic myeloid leukemia (CML). This study examines healthcare outcomes among elderly Medicare beneficiaries with CML who started nilotinib or dasatinib after imatinib. Research design and methods Patients were identified in the Medicare Research Identifiable Files (2006-2012) and had continuous Medicare Parts A, B, and D coverage. Main outcome measures Treatment patterns, overall survival (OS), monthly healthcare resource utilization and medical costs were measured from the second-line tyrosine kinase inhibitor (TKI) initiation (index date) to end of Medicare coverage. Results Despite similar adherence, dasatinib patients (N = 379) were more likely to start on the recommended dose (74% vs. 53%; p < 0.001), and to have dose reductions (21% vs. 11%, adjusted hazard ratio [HR] = 1.94; p = 0.002) or dose increases (9% vs. 7%; adjusted HR = 1.81; p = 0.048) than nilotinib patients (N = 280). Fewer nilotinib patients discontinued (59% vs. 67%; adjusted HR = 0.80; p = 0.026) or switched to another TKI (21% vs. 29%; adjusted HR = 0.72; p = 0.044) than dasatinib patients. Nilotinib patients had longer median OS (>4.9 years vs. 4.0 years; p = 0.032) and 37% lower mortality risk than dasatinib patients (adjusted HR = 0.63; p = 0.008). Nilotinib patients had 23% fewer inpatient admissions, 30% fewer emergency room visits, 13% fewer outpatient visits (all p < 0.05), and lower monthly medical costs (by $513, p = 0.024) than dasatinib patients. Limitations Lack of clinical assessment (disease phase and response to first-line therapy) and retrospective nature of study (unobservable potential confounding factors, non-randomized treatment choice). Conclusions In the current study of elderly CML patients, initiation of second-line TKIs frequently occurs at doses lower than the recommended starting doses and, despite this, many patients require dose adjustments. Here, nilotinib patients required fewer dose adjustments than dasatinib patients. Further research focusing on elderly CML patients is warranted in order to help define future best clinical practices.
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Affiliation(s)
- B Douglas Smith
- a Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins , Baltimore , MD , USA
| | - Jun Liu
- b Harvard University , Cambridge , MA , USA
| | | | - Annie Guerin
- c Analysis Group Inc. , Montreal, Quebec, Canada
| | | | - Lei Chen
- d Novartis Pharmaceuticals Corporation , East Hanover , NJ , USA
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Abstract
Nilotinib is a second-generation Bcr-Abl tyrosine kinase inhibitor (TKI) that is approved for the treatment of imatinib-resistant chronic myeloid leukaemia expressing the Bcr-Abl mutation. Cutaneous adverse drug reactions occur more frequently in patients using this medication. We present a case of nilotinib-induced keratosis pilaris that did not have accompanying symptoms of alopecia or pruritus. Greater recognition of this association is needed so that appropriate treatment can be instituted to ensure a good oncologic outcome.
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Affiliation(s)
- Wai Mun Sean Leong
- Division of Dermatology, Department of Medicine, National University Health Systems, Singapore, Singapore
| | - Chen Wee Derrick Aw
- Division of Dermatology, Department of Medicine, National University Health Systems, Singapore, Singapore
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Chen L, Wu EQ. Adherence and Persistence Among Chronic Myeloid Leukemia Patients During Second-Line Tyrosine Kinase Inhibitor Treatment. J Manag Care Spec Pharm 2016; 21:1088. [PMID: 26521120 PMCID: PMC10397974 DOI: 10.18553/jmcp.2015.21.11.1088] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
In a study published last year in the October 2014 issue of the Journal of Managed Care Specialty Pharmacy, Trivedi et al. compared treatment patterns of dasatinib and nilotinib as second-line tyrosine kinase inhibitors (TKI) therapy in chronic myeloid leukemia (CML) patients during the first year of treatment.1 Trivedi et al. concluded that among second-line TKI-treated patients, dasatinib patients had significantly higher adherence and lower discontinuation rates compared with those receiving nilotinib. We feel that although the study presents results that are of particular interest to the CML community, certain aspects of the study design raise questions, and the conclusions need to be cautiously considered, since they appear not to be fully substantiated by some of the presented results.
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Affiliation(s)
- Lei Chen
- Novartis Pharmaceuticals Corporation,
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20
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Kekäle M, Peltoniemi M, Airaksinen M. Patient-reported adverse drug reactions and their influence on adherence and quality of life of chronic myeloid leukemia patients on per oral tyrosine kinase inhibitor treatment. Patient Prefer Adherence 2015; 9:1733-40. [PMID: 26677317 PMCID: PMC4677761 DOI: 10.2147/ppa.s92125] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
PURPOSE To evaluate adverse drug reactions (ADRs) experienced by chronic myeloid leukemia (CML) patients during per oral tyrosine kinase inhibitor (TKI) treatment and correlation of ADR symptoms with medication adherence and perceived quality of life (QoL). PATIENTS AND METHODS Eighty-six adult, chronic-phase CML patients who had been on TKI treatment (79% on imatinib, 10.5% dasatinib, and 10.5% nilotinib) for at least 6 months participated in the study (mean age: 57.8 years, 52% males). The mean time from diagnosis was 5.1 years. All patients were interviewed, and patient-reported ADRs were obtained using a structured list. Adherence was assessed using Morisky's 8-item Medication Adherence Scale (MMAS). The symptoms' interference with patient's daily QoL was measured by asking patients about the influence of symptom(s) on their mood, general condition, enjoyment of life, walking, relationships, and work. RESULTS Ninety-seven percent of the patients were suffering from at least one ADR. The mean number of different symptoms was seven (range: 0-15, median 6). The most commonly perceived ADRs were muscle soreness or cramp (69/86, 80%); swelling of hands, legs, feet, or around the eyes (59/86, 69%); and fatigue (43/86, 50%). No correlation was found between adherence and ADRs, because symptoms were equally common in each MMAS adherence class. Half of the patients felt that the ADRs had a negative influence on their daily QoL. A quarter of the patients reported that ADRs affected either their mood, general condition, or enjoyment of life. The incidence of almost all ADRs was much higher among patients reporting negative influence of ADRs on their daily life compared to total study population (P=0.016). CONCLUSION TKI-related ADRs were common among CML patients irrespective of patient's adherence level. Patients who reported that ADRs had a negative influence on their daily QoL perceived more ADRs than those who did not experience a negative influence.
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Affiliation(s)
- Meri Kekäle
- Clinical Pharmacy Group, Division of Pharmacology and Pharmacotherapy, University of Helsinki, Helsinki, Finland
| | - Marikki Peltoniemi
- Division of Pharmaceutical Chemistry and Technology, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
| | - Marja Airaksinen
- Clinical Pharmacy Group, Division of Pharmacology and Pharmacotherapy, University of Helsinki, Helsinki, Finland
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Barillet M, Prevost V, Joly F, Clarisse B. Oral antineoplastic agents: how do we care about adherence? Br J Clin Pharmacol 2015; 80:1289-302. [PMID: 26255807 DOI: 10.1111/bcp.12734] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2015] [Revised: 07/24/2015] [Accepted: 08/03/2015] [Indexed: 12/30/2022] Open
Abstract
AIMS Oral therapies, including hormone-based or targeted therapies, have recently taken an increasing place in cancer treatment. In this context, a state of the art of the available studies dealing with the adherence of adult patients to oral anticancer treatment is warranted. The purpose of this review is to address (i) the association between assessment methods and measured adherence, (ii) the putative factors related to adherence and (iii) new ways of improving adherence to oral cancer therapies. METHODS We conducted a literature-based narrative review of studies obtained from Pubmed using medical subject heading terms and free-text terms combining concepts related to oral anticancer medication and adherence. RESULTS The analysis is based on 48 studies published since 1990, mostly assessing hormone-based therapy in breast cancer and targeted therapies in chronic myeloid leukaemia. Various methods of adherence were reported including self-report, medication measurement or combinations of methods. Adherence rates were found to vary from 14% to 100%. Beside patient related-factors, adherence rate discrepancies were found to be dependent on the method used. Furthermore, there was no consensual definition of adherence even regarding the same methods, some of them tolerating a period of interruption during the treatment period. Finally, several studies addressing persistence found a progressive decrease in adherence with time. CONCLUSION Adherence to novel oral therapies is a major issue and further research is warranted to standardize adherence assessment in clinical studies better and to define better the most appropriate approaches to improve long term adherence in oncology practice.
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Affiliation(s)
- Marie Barillet
- Centre Hospitalier J Monod, rue Eugène Garnier BP 219, 61104, Flers cedex
| | - Virginie Prevost
- Université de Caen Basse-Normandie EA 3936, Esplanade de la Paix, BP 5186, 14032, Caen Cedex 05.,INSERM U1086, Cancers et Préventions, Avenue de la Côte de Nacre, F-14000, Caen.,Centre Régional de Lutte Contre le Cancer François Baclesse, 3 Avenue du Général Harris, 14000, Caen, France
| | - Florence Joly
- Université de Caen Basse-Normandie EA 3936, Esplanade de la Paix, BP 5186, 14032, Caen Cedex 05.,INSERM U1086, Cancers et Préventions, Avenue de la Côte de Nacre, F-14000, Caen.,Centre Régional de Lutte Contre le Cancer François Baclesse, 3 Avenue du Général Harris, 14000, Caen, France
| | - Bénédicte Clarisse
- Centre Régional de Lutte Contre le Cancer François Baclesse, 3 Avenue du Général Harris, 14000, Caen, France
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Hall AE, Paul C, Bryant J, Lynagh MC, Rowlings P, Enjeti A, Small H. To adhere or not to adhere: Rates and reasons of medication adherence in hematological cancer patients. Crit Rev Oncol Hematol 2015; 97:247-62. [PMID: 26412718 DOI: 10.1016/j.critrevonc.2015.08.025] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2015] [Revised: 07/28/2015] [Accepted: 08/26/2015] [Indexed: 01/18/2023] Open
Abstract
To conduct a comprehensive review to examine among hematological cancer patients: (1) rates of adherence to self-administered cancer treatments; and (2) factors impacting on their adherence. Fifty two eligible publications were identified. The majority focused on Chronic Myeloid Leukaemia (CML) (n=40) and Acute Lymphoid Leukaemia (ALL) (n=11) patients. Adherence rates varied and depended on the definition and measures used. Patient understanding about their disease and treatment, and forgetting to take their medication impacted on patients' level of adherence; while the use of reminders reduced forgetfulness. There is a lack of valid and reliable information relating to medication adherence of hematological cancer patients. Based on the limited data available we provide a profile of CML and ALL patients at potential risk of medication non-adherence, as well as a proposed checklist that can be used by health care providers in assessing and supporting patients in adhering to their medication.
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Affiliation(s)
- Alix E Hall
- Priority Research Centre for Health Behaviour, Faculty of Health, The University of Newcastle & Hunter Medical Research Institute, Callaghan, NSW 2308, Australia.
| | - Chris Paul
- Priority Research Centre for Health Behaviour, Faculty of Health, The University of Newcastle & Hunter Medical Research Institute, Callaghan, NSW 2308, Australia.
| | - Jamie Bryant
- Priority Research Centre for Health Behaviour, Faculty of Health, The University of Newcastle & Hunter Medical Research Institute, Callaghan, NSW 2308, Australia.
| | - Marita C Lynagh
- Priority Research Centre for Health Behaviour, Faculty of Health, The University of Newcastle & Hunter Medical Research Institute, Callaghan, NSW 2308, Australia.
| | - Philip Rowlings
- Haematology Unit, Calvary Mater Hospital Newcastle, Waratah, NSW 2298, Australia; School of Medicine and Public Health, Faculty of Health, The University of Newcastle, Callaghan, NSW 2308, Australia.
| | - Anoop Enjeti
- Haematology Unit, Calvary Mater Hospital Newcastle, Waratah, NSW 2298, Australia; School of Medicine and Public Health, Faculty of Health, The University of Newcastle, Callaghan, NSW 2308, Australia.
| | - Hannah Small
- Priority Research Centre for Health Behaviour, Faculty of Health, The University of Newcastle & Hunter Medical Research Institute, Callaghan, NSW 2308, Australia.
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Di Bella NJ, Bhowmik D, Bhor M, Yap M, Middlebrook B, Rembert D, Cain Z, Okoro T, Bolinder B, Patt D, Jabbour EJ. The Effectiveness of Tyrosine Kinase Inhibitors and Molecular Monitoring Patterns in Newly Diagnosed Patients With Chronic Myeloid Leukemia in the Community Setting. CLINICAL LYMPHOMA MYELOMA & LEUKEMIA 2015. [PMID: 26208445 DOI: 10.1016/j.clml.2015.06.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Clinical outcomes of patients with chronic myeloid leukemia (CML) treated in clinical trials, including response to therapy, may not be representative of those treated in a community setting. Thus, we sought to determine the real-world effectiveness of first-line tyrosine kinase inhibitors in CML by evaluating response rates, all-cause discontinuation, and adherence. Response monitoring patterns were also analyzed. PATIENTS AND METHODS This retrospective observational study, using the McKesson Specialty Health/US Oncology Network (MSH/USON) iKnowMed electronic health record database and medical charts, identified newly diagnosed CML patients who received first-line imatinib, dasatinib, or nilotinib from July 2007 to March 2011, and were then followed for ≥ 18 months. RESULTS Three hundred patients met study criteria (222 imatinib-treated, 34 dasatinib-treated, and 44 nilotinib-treated in the first-line). Molecular and cytogenetic response assessments were conducted less frequently than recommended (40% never had cytogenetic or molecular monitoring at any time). Patients treated with either dasatinib or nilotinib experienced higher response rates by 6, 12, and 18 months, faster time to major molecular response, and a significantly lower rate of all-cause treatment discontinuation within 18 months relative to imatinib-treated patients. Approximately 56% of all patients were adherent to tyrosine kinase inhibitor therapy. CONCLUSION Dasatinib and nilotinib were more effective than imatinib as first-line therapy for CML in a community setting, as observed in descriptive and univariate analyses. The frequency of cytogenetic and molecular monitoring was lower than that recommended by current guidelines, including patients with no molecular or cytogenetic assessments during the 18-month follow-up. Therefore, MSH/USON is working toward improving compliance with response monitoring guidelines.
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Affiliation(s)
- Nicholas J Di Bella
- Rocky Mountain Cancer Centers, Aurora, CO; McKesson Specialty Health/US Oncology Network, The Woodlands, TX.
| | | | - Menaka Bhor
- McKesson Specialty Health/US Oncology Network, The Woodlands, TX
| | - Mark Yap
- McKesson Specialty Health/US Oncology Network, The Woodlands, TX
| | | | - Debra Rembert
- McKesson Specialty Health/US Oncology Network, The Woodlands, TX
| | | | | | | | - Debra Patt
- McKesson Specialty Health/US Oncology Network, The Woodlands, TX
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Real-world Analysis of Tyrosine Kinase Inhibitor Treatment Patterns Among Patients With Chronic Myeloid Leukemia in the United States. Clin Ther 2015; 37:124-33. [DOI: 10.1016/j.clinthera.2014.10.019] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Revised: 09/18/2014] [Accepted: 10/23/2014] [Indexed: 01/28/2023]
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de Almeida MH, Fogliatto L, Couto D. Importance of adherence to BCR-ABL tyrosine-kinase inhibitors in the treatment of chronic myeloid leukemia. Rev Bras Hematol Hemoter 2014; 36:54-9. [PMID: 24624037 PMCID: PMC3948667 DOI: 10.5581/1516-8484.20140014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2012] [Accepted: 08/19/2013] [Indexed: 01/02/2023] Open
Abstract
Treatment of chronic myeloid leukemia with BCR-ABL tyrosine kinase inhibitors requires full adherence in order to maximize the likelihood of achieving optimal responses, and to minimize healthcare costs. In this article, we review some of the methods available for assessing compliance, the main consequences of nonadherence on treatment outcomes, major factors commonly associated with poor compliance, a few successful measures for improving adherence and the most accepted recommendations for proactively managing adverse events.
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Affiliation(s)
| | - Laura Fogliatto
- Hospital de Clínicas de Porto Alegre (HCPA), Porto Alegre, RS, Brazil
| | - Dulce Couto
- Instituto Nacional de Câncer (INCA), Rio de Janeiro, RJ, Brazil
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Noens L, Hensen M, Kucmin-Bemelmans I, Lofgren C, Gilloteau I, Vrijens B. Measurement of adherence to BCR-ABL inhibitor therapy in chronic myeloid leukemia: current situation and future challenges. Haematologica 2014; 99:437-47. [PMID: 24598855 PMCID: PMC3943306 DOI: 10.3324/haematol.2012.082511] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Accepted: 10/30/2013] [Indexed: 12/20/2022] Open
Abstract
BCR-ABL inhibitors for treating chronic myeloid leukemia in chronic phase have transformed a previously incurable malignancy into a manageable condition. However, suboptimal medication adherence has been observed with these agents affecting clinical outcomes and healthcare costs. In order to raise awareness of the problem of adherence, and before developing pragmatic strategies to enhance medication adherence, a deep understanding of the best approaches for measuring adherence in chronic myeloid leukemia patients and identifying non-adherence is required. A systematic literature review on the prevalence, measurement methods, consequences and risk factors for non-adherence to BCR-ABL inhibitors and adherence-enhancing interventions was performed and critically appraised. Of the 19 included articles, 9 were retrospective. Average adherence varied from 19% to almost 100% of the proportion of prescribed drug taken, but it was measured through various different methods and within different study groups. Suboptimal adherence was associated with a negative impact on both clinical and economic outcomes. There is a lack of supportive evidence demonstrating a difference in adherence across BCR-ABL inhibitors and even contradictory results between the 2(nd) generation inhibitors. Drug-related adverse events and forgetfulness were common reasons for intentional and unintentional non-adherence, respectively, but further research is required to identify additional reasons behind non-adherence or patients at risk of non-adherence. Non-adherence in chronic myeloid leukemia patients treated with BCR-ABL inhibitors is common and associated with critical outcomes. However, this review highlights important existing gaps, reveals inconsistent definitions, and a lack of standardized methods for measuring adherence in chronic myeloid leukemia. All require further investigation.
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Cella D, Nowinski CJ, Frankfurt O. The Impact of Symptom Burden on Patient Quality of Life in Chronic Myeloid Leukemia. Oncology 2014; 87:133-47. [DOI: 10.1159/000362816] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Accepted: 04/08/2014] [Indexed: 11/19/2022]
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Simoneau CA. Treating chronic myeloid leukemia: improving management through understanding of the patient experience. Clin J Oncol Nurs 2013; 17:E13-20. [PMID: 23372106 DOI: 10.1188/13.cjon.e13-e20] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The tremendous progress made in chronic myeloid leukemia (CML) treatment affords patients more options than ever. Five currently available BCR-ABL inhibitors form the mainstay of CML treatment, including first-generation imatinib and more potent second-generation BCR-ABL inhibitors dasatinib and nilotinib, with bosutinib and ponatinib having been recently approved for market inclusion. Studies show that dasatinib and nilotinib exhibit greater efficacy than imatinib in first-line chronic-phase CML (CML-CP), allowing more patients to achieve deeper, more rapid responses associated with improved outcomes. With alternatives to imatinib for first-line CML-CP and the wealth of information (and misinformation) on the Internet, a tremendous need exists for clear, accurate facts to assist patients in making treatment decisions. Patients appreciate the guidance of their oncology nurse in providing disease, treatment, and monitoring information tailored to meet their needs. Oncology nurses who are able to clearly explain emerging data, including the meaning and significance of faster, deeper responses, will be a valuable resource to their patients.
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Patel AC. Clinical relevance of target identity and biology: implications for drug discovery and development. ACTA ACUST UNITED AC 2013; 18:1164-85. [PMID: 24080260 DOI: 10.1177/1087057113505906] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Many of the most commonly used drugs precede techniques for target identification and drug specificity and were developed on the basis of efficacy and safety, an approach referred to as classical pharmacology and, more recently, phenotypic drug discovery. Although substantial gains have been made during the period of focus on target-based approaches, particularly in oncology, these approaches have suffered a high overall failure rate and lower productivity in terms of new drugs when compared with phenotypic approaches. This review considers the importance of target identity and biology in clinical practice from the prescriber's viewpoint. In evaluating influences on prescribing behavior, studies suggest that target identity and mechanism of action are not significant factors in drug choice. Rather, patients and providers consistently value efficacy, safety, and tolerability. Similarly, the Food and Drug Administration requires evidence of safety and efficacy for new drugs but does not require knowledge of drug target identity or target biology. Prescribers do favor drugs with novel mechanisms, but this preference is limited to diseases for which treatments are either not available or suboptimal. Thus, while understanding of drug target and target biology is important from a scientific perspective, it is not particularly important to prescribers, who prioritize efficacy and safety.
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Affiliation(s)
- Anand C Patel
- 1Washington University School of Medicine, St. Louis, MO, USA
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Guérin A, Chen L, Wu EQ, Ponce de Leon D, Griffin JD. A retrospective analysis of therapy adherence in imatinib resistant or intolerant patients with chronic myeloid leukemia receiving nilotinib or dasatinib in a real-world setting. Curr Med Res Opin 2012; 28:1155-62. [PMID: 22738777 DOI: 10.1185/03007995.2012.705264] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
OBJECTIVES To compare adherence to second-generation tyrosine kinase inhibitors (TKIs) dasatinib and nilotinib in patients with imatinib resistant or intolerant chronic myeloid leukemia (CML) receiving second-line therapies. METHODS Two U.S. administrative claims databases were reviewed (January 1997 to March 2011) for CML patients previously treated with imatinib, who received ≥1 prescription of dasatinib or nilotinib and had continuous enrollment ≥1 month before and after the index date (first dasatinib or nilotinib prescription date). Medication possession ratios (MPRs) and proportion of days covered (PDCs) were evaluated between the treatment initiation date until the end of continuous eligibility, for a maximum of 12 months. Sensitivity analyses were conducted to compare patients initiated on nilotinib to patients who initiated dasatinib 100 mg/day and 140 mg/day separately. This study provides updated results of a previously published study. RESULTS In total, 878 CML patients who received second-line treatment with either dasatinib (n = 550) or nilotinib (n = 328) were studied. Dasatinib users were less adherent compared to nilotinib users; mean MPR was 0.739 (standard deviation [SD] 0.246) for dasatinib and 0.800 (SD 0.246) for nilotinib (adjusted difference = 0.061; P = 0.002). Subgroup analyses of patients who initiated dasatinib 100 mg/day and 140 mg/day separately presented similar trends; after multivariate adjustment, adherence was 0.039 points lower in the 100 mg/day group (P = 0.034) and 0.120 points lower in the 140 mg/day group (P < 0.001). CONCLUSIONS Among patients treated in the second-line CML setting, those treated with nilotinib had significantly higher adherence compared to patients treated with dasatinib, regardless of dasatinib dose (100 mg/day and 140 mg/day). LIMITATIONS The study was subject to common limitations of claims data, which lack clinical information, may contain inaccuracies in diagnosis and procedure coding, and may not truly reflect actual drug consumption. Moreover, daily doses calculated based on refill records may not reflect accurate dosing regimens.
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Wu E, Chen L. Re: Ulcickas Yood M, Oliveria SA, Cziraky M, et al. Adherence to treatment with second-line therapies, dasatinib and nilotinib, in patients with chronic myeloid leukemia. Curr Med Res Opin 2012, 28(2): 213-19. Curr Med Res Opin 2012; 28:1164; author reply 1164-5. [PMID: 22697275 DOI: 10.1185/03007995.2012.703135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Breccia M, Efficace F, Alimena G. Adherence to treatment is a complex and multifaceted issue that can substantially alter the outcome of chronic myeloid leukemia patients treated with tyrosine kinase inhibitors. Leuk Res 2012; 36:804-5. [PMID: 22459331 DOI: 10.1016/j.leukres.2012.02.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2012] [Revised: 02/14/2012] [Accepted: 02/28/2012] [Indexed: 11/17/2022]
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