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Watanabe H, Nagano N, Tsuji Y, Noto N, Ayusawa M, Morioka I. Challenges of pediatric pharmacotherapy: A narrative review of pharmacokinetics, pharmacodynamics, and pharmacogenetics. Eur J Clin Pharmacol 2024; 80:203-221. [PMID: 38078929 DOI: 10.1007/s00228-023-03598-x] [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: 08/14/2023] [Accepted: 11/20/2023] [Indexed: 02/07/2024]
Abstract
PURPOSE Personalized pharmacotherapy, including for the pediatric population, provides optimal treatment and has emerged as a major trend owing to advanced drug therapeutics and diversified drug selection. However, it is essential to understand the growth and developmental characteristics of this population to provide appropriate drug therapy. In recent years, clinical pharmacogenetics has accumulated knowledge in pediatric pharmacotherapy, and guidelines from professional organizations, such as the Clinical Pharmacogenetics Implementation Consortium, can be consulted to determine the efficacy of specific drugs and the risk of adverse effects. However, the existence of a large knowledge gap hinders the use of these findings in clinical practice. METHODS We provide a narrative review of the knowledge gaps in pharmacokinetics (PK) and pharmacodynamics (PD) in the pediatric population, focusing on the differences from the perspective of growth and developmental characteristics. In addition, we explored PK/PD in relation to pediatric clinical pharmacogenetics. RESULTS The lack of direct and indirect biomarkers for more accurate assessment of the effects of drug administration limits the current knowledge of PD. In addition, incorporating pharmacogenetic insights as pivotal covariates is indispensable in this comprehensive synthesis for precision therapy; therefore, we have provided recommendations regarding the current status and challenges of personalized pediatric pharmacotherapy. The integration of clinical pharmacogenetics with the health care system and institution of educational programs for health care providers is necessary for its safe and effective implementation. A comprehensive understanding of the physiological and genetic complexities of the pediatric population will facilitate the development of effective and personalized pharmacotherapeutic strategies.
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Affiliation(s)
- Hirofumi Watanabe
- Department of Pediatrics and Child Health, Nihon University School of Medicine, 30-1 Kami-cho Ooyaguchi, Itabashi-ku, Tokyo, 173-8610, Japan.
| | - Nobuhiko Nagano
- Department of Pediatrics and Child Health, Nihon University School of Medicine, 30-1 Kami-cho Ooyaguchi, Itabashi-ku, Tokyo, 173-8610, Japan
| | - Yasuhiro Tsuji
- Laboratory of Clinical Pharmacometrics, School of Pharmacy, Nihon University, Chiba, Japan
| | - Nobutaka Noto
- Department of Pediatrics and Child Health, Nihon University School of Medicine, 30-1 Kami-cho Ooyaguchi, Itabashi-ku, Tokyo, 173-8610, Japan
| | - Mamoru Ayusawa
- Department of Pediatrics and Child Health, Nihon University School of Medicine, 30-1 Kami-cho Ooyaguchi, Itabashi-ku, Tokyo, 173-8610, Japan
| | - Ichiro Morioka
- Department of Pediatrics and Child Health, Nihon University School of Medicine, 30-1 Kami-cho Ooyaguchi, Itabashi-ku, Tokyo, 173-8610, Japan
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Zeng Z, Jiang M, Li X, Yuan J, Zhang H. Precision medicine in inflammatory bowel disease. PRECISION CLINICAL MEDICINE 2023; 6:pbad033. [PMID: 38638127 PMCID: PMC11025389 DOI: 10.1093/pcmedi/pbad033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Accepted: 12/13/2023] [Indexed: 04/20/2024] Open
Abstract
Inflammatory bowel disease (IBD) is an incurable disease characterized by remission-relapse cycles throughout its course. Both Crohn's disease (CD) and ulcerative colitis (UC), the two main forms of IBD, exhibit tendency to develop complications and substantial heterogeneity in terms of frequency and severity of relapse, thus posing great challenges to the clinical management for IBD. Current treatment strategies are effective in different ways in induction and maintenance therapies for IBD. Recent advances in studies of genetics, pharmacogenetics, proteomics and microbiome provide a strong driving force for identifying molecular markers of prognosis and treatment response, which should help clinicians manage IBD patients more effectively, and then, improve clinical outcomes and reduce treatment costs of patients. In this review, we summarize and discuss precision medicine in IBD, focusing on predictive markers of disease course and treatment response, and monitoring indices during therapeutic drug monitoring.
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Affiliation(s)
- Zhen Zeng
- Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu 610041, China
- Centre for Inflammatory Bowel Disease, West China Hospital, Sichuan University, Chengdu 610041, China
- Lab of Inflammatory Bowel Disease, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Mingshan Jiang
- Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu 610041, China
- Centre for Inflammatory Bowel Disease, West China Hospital, Sichuan University, Chengdu 610041, China
- Lab of Inflammatory Bowel Disease, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Xi Li
- Lab of Inflammatory Bowel Disease, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu 610041, China
- General Practice Ward/International Medical Center Ward, General Practice Medical Center, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Jing Yuan
- Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu 610041, China
- Centre for Inflammatory Bowel Disease, West China Hospital, Sichuan University, Chengdu 610041, China
- Lab of Inflammatory Bowel Disease, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu 610041, China
| | - Hu Zhang
- Department of Gastroenterology, West China Hospital, Sichuan University, Chengdu 610041, China
- Centre for Inflammatory Bowel Disease, West China Hospital, Sichuan University, Chengdu 610041, China
- Lab of Inflammatory Bowel Disease, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, Sichuan University, Chengdu 610041, China
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Jelovac M, Kotur N, Ristivojevic B, Pavlovic D, Spasovski V, Damjanov N, Pavlovic S, Zukic B. Can Pharmacogenetic Variants in TPMT, MTHFR and SLCO1B1 Genes Be Used as Potential Markers of Outcome Prediction in Systemic Sclerosis Patients? Int J Mol Sci 2023; 24:ijms24108538. [PMID: 37239884 DOI: 10.3390/ijms24108538] [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] [Received: 04/03/2023] [Revised: 04/28/2023] [Accepted: 05/05/2023] [Indexed: 05/28/2023] Open
Abstract
Systemic sclerosis (SSc) is a rare connective tissue disorder with highest morbidity and mortality among rheumatologic diseases. Disease progression is highly heterogeneous between patients, implying a strong need for individualization of therapy. Four pharmacogenetic variants, namely TPMT rs1800460, TPMT rs1142345, MTHFR rs1801133 and SLCO1B1 rs4149056 were tested for association with severe disease outcomes in 102 patients with SSc from Serbia treated either with immunosuppressants azathioprine (AZA) and methotrexate (MTX) or with other types of medications. Genotyping was performed using PCR-RFLP and direct Sanger sequencing. R software was used for statistical analysis and development of polygenic risk score (PRS) model. Association was found between MTHFR rs1801133 and higher risk for elevated systolic pressure in all patients except those prescribed with MTX, and higher risk for kidney insufficiency in patients prescribed with other types of drugs. In patients treated with MTX, variant SLCO1B1 rs4149056 was protective against kidney insufficiency. For patients receiving MTX a trend was shown for having a higher PRS rank and elevated systolic pressure. Our results open a door wide for more extensive research on pharmacogenomics markers in patients with SSc. Altogether, pharmacogenomics markers could predict the outcome of patients with SSc and help in prevention of adverse drug reactions.
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Affiliation(s)
- Marina Jelovac
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, 11000 Belgrade, Serbia
| | - Nikola Kotur
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, 11000 Belgrade, Serbia
| | - Bojan Ristivojevic
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, 11000 Belgrade, Serbia
| | - Djordje Pavlovic
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, 11000 Belgrade, Serbia
| | - Vesna Spasovski
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, 11000 Belgrade, Serbia
| | - Nemanja Damjanov
- Institute of Rheumatology, 11000 Belgrade, Serbia
- Medical School, University of Belgrade, 11000 Belgrade, Serbia
| | - Sonja Pavlovic
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, 11000 Belgrade, Serbia
| | - Branka Zukic
- Institute of Molecular Genetics and Genetic Engineering, University of Belgrade, Vojvode Stepe 444a, 11000 Belgrade, Serbia
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Pharmacogenetic Aspects of Drug Metabolizing Enzymes and Transporters in Pediatric Medicine: Study Progress, Clinical Practice and Future Perspectives. Paediatr Drugs 2023; 25:301-319. [PMID: 36707496 DOI: 10.1007/s40272-023-00560-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/09/2023] [Indexed: 01/28/2023]
Abstract
As the activity of certain drug metabolizing enzymes or transporter proteins can vary with age, the effect of ontogenetic and genetic variation on the activity of these enzymes is critical for the accurate prediction of treatment outcomes and toxicity in children. This makes pharmacogenetic research in pediatrics particularly important and urgently needed, but also challenging. This review summarizes pharmacogenetic studies on the effects of genetic polymorphisms on pharmacokinetic parameters and clinical outcomes in pediatric populations for certain drugs, which are commonly prescribed by clinicians across multiple therapeutic areas in a general hospital, organized from those with the most to the least pediatric evidence among each drug category. We also further discuss the research status of the gene-guided dosing regimens and clinical implementation of pediatric pharmacogenetics. More and more drug-gene interactions are demonstrated to have clinical validity for children, and pharmacogenomics in pediatrics have shown evidence-based benefits to enhance the efficacy and precision of existing drug dosing regimens in several therapeutic areas. However, the most important limitation to the implementation is the lack of high-quality, rigorous pediatric prospective clinical studies, so adequately powered interventional clinical trials that support incorporation of pharmacogenetics into the care of children are still needed.
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Reizine NM, Danahey K, Truong TM, George D, House LK, Karrison TG, van Wijk XMR, Yeo KTJ, Ratain MJ, O'Donnell PH. Clinically actionable genotypes for anticancer prescribing among >1500 patients with pharmacogenomic testing. Cancer 2022; 128:1649-1657. [PMID: 35090043 PMCID: PMC9153953 DOI: 10.1002/cncr.34104] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 11/18/2021] [Accepted: 11/22/2021] [Indexed: 11/09/2022]
Abstract
BACKGROUND In recent years, there has been increasing evidence supporting the role of germline pharmacogenomic factors predicting toxicity for anticancer therapies. Although somatic genomic data are used frequently in oncology care planning, germline pharmacogenomic testing is not. This study hypothesizes that comprehensive germline pharmacogenomic profiling could have high relevance for cancer care. METHODS Between January 2011 and August 2020, patients at the University of Chicago Medical Center were genotyped across custom germline pharmacogenomic panels for reasons unrelated to cancer care. Actionable anticancer pharmacogenomic gene/drug interactions identified by the FDA were defined including: CYP2C9 (erdafitinib), CYP2D6 (gefitinib), DPYD (5-fluorouracil and capecitabine), TPMT (thioguanine and mercaptopurine), and UGT1A1 (belinostat, irinotecan, nilotinib, pazopanib, and sacituzumab-govitecan hziy). The primary objective was to determine the frequency of individuals with actionable or high-risk genotypes across these 5 key pharmacogenes, thus potentially impacting prescribing for at least 1 of these 11 commonly prescribed anticancer therapies. RESULTS Data from a total of 1586 genotyped individuals were analyzed. The oncology pharmacogene with the highest prevalence of high-risk, actionable genotypes was UGT1A1, impacting 17% of genotyped individuals. Actionable TPMT and DPYD genotypes were found in 9% and 4% of patients, respectively. Overall, nearly one-third of patients genotyped across all 5 genes (161/525, 31%) had at least one actionable genotype. CONCLUSIONS These data suggest that germline pharmacogenomic testing for 5 key pharmacogenes could identify a substantial proportion of patients at risk with standard dosing, an estimated impact similar to that of somatic genomic profiling. LAY SUMMARY Differences in our genes may explain why some drugs work safely in certain individuals but can cause side effects in others. Pharmacogenomics is the study of how genetic variations affect an individual's response to medications. In this study, an evaluation was done for important genetic variations that can affect the tolerability of anticancer therapy. By analyzing the genetic results of >1500 patients, it was found that nearly one-third have genetic variations that could alter recommendations of what drug, or how much of, an anticancer therapy they should be given. Performing pharmacogenomic testing before prescribing could help to guide personalized oncology care.
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Affiliation(s)
- Natalie M Reizine
- Section of Hematology/Oncology, Department of Medicine, University of Chicago Medical Center and Biological Sciences, Chicago, Illinois.,Center for Personalized Therapeutics, University of Chicago, Chicago, Illinois
| | - Keith Danahey
- Center for Personalized Therapeutics, University of Chicago, Chicago, Illinois.,Center for Research Informatics, University of Chicago, Chicago, Illinois
| | - Tien M Truong
- Section of Hematology/Oncology, Department of Medicine, University of Chicago Medical Center and Biological Sciences, Chicago, Illinois.,Center for Personalized Therapeutics, University of Chicago, Chicago, Illinois
| | - David George
- Center for Personalized Therapeutics, University of Chicago, Chicago, Illinois.,Department of Pathology, University of Chicago Medical Center and Biological Sciences, Chicago, Illinois
| | - Larry K House
- Section of Hematology/Oncology, Department of Medicine, University of Chicago Medical Center and Biological Sciences, Chicago, Illinois.,Center for Personalized Therapeutics, University of Chicago, Chicago, Illinois
| | - Theodore G Karrison
- Department of Public Health Sciences, University of Chicago, Chicago, Illinois
| | - Xander M R van Wijk
- Center for Personalized Therapeutics, University of Chicago, Chicago, Illinois.,Department of Pathology, University of Chicago Medical Center and Biological Sciences, Chicago, Illinois.,Committee on Clinical Pharmacology and Pharmacogenomics, University of Chicago, Chicago, Illinois
| | - Kiang-Teck J Yeo
- Center for Personalized Therapeutics, University of Chicago, Chicago, Illinois.,Department of Pathology, University of Chicago Medical Center and Biological Sciences, Chicago, Illinois.,Committee on Clinical Pharmacology and Pharmacogenomics, University of Chicago, Chicago, Illinois
| | - Mark J Ratain
- Section of Hematology/Oncology, Department of Medicine, University of Chicago Medical Center and Biological Sciences, Chicago, Illinois.,Center for Personalized Therapeutics, University of Chicago, Chicago, Illinois.,Committee on Clinical Pharmacology and Pharmacogenomics, University of Chicago, Chicago, Illinois
| | - Peter H O'Donnell
- Section of Hematology/Oncology, Department of Medicine, University of Chicago Medical Center and Biological Sciences, Chicago, Illinois.,Center for Personalized Therapeutics, University of Chicago, Chicago, Illinois.,Committee on Clinical Pharmacology and Pharmacogenomics, University of Chicago, Chicago, Illinois
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Müller-Scholden L, Deinlein F, Eyrich M, Schlegel PG, Wiegering V, Wölfl M. Case Report: Multifocal EBV-Associated Diffuse Large B-Cell Lymphoma in a Patient With 6-MP Associated Lymphopenia With TPMT Deficiency. Front Pediatr 2022; 10:881612. [PMID: 35601437 PMCID: PMC9120811 DOI: 10.3389/fped.2022.881612] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 04/07/2022] [Indexed: 12/03/2022] Open
Abstract
INTRODUCTION EBV associated lymphoproliferative disorders (EBV LPD) are a known complication following solid organ or hematopoietic stem cell transplantation. The disturbance of the immune system leads to a lack of control of latent EBV-infected B-cells, as control by T-cells is mandatory to prevent uninhibited cell proliferation. EBV LPD in other settings is less frequent and etiology and pathogenesis are not completely understood. CASE PRESENTATION We present the case of an 18-year old adolescent suffering from lymphoblastic T-cell lymphoma who developed a life-threatening EBV associated B-cell lymphoma while he was under therapy with 6-MP (6- mercaptopurine). An underlying homozygous TPMT (thiopurine S-methyltransferase) deficiency with subsequent insufficient degradation of 6-MP was identified as contributory for the development of a distinct lymphopenia leading to EBV LPD. The patient was successfully treated by discontinuation of 6-MP and initiating rituximab monotherapy. DISCUSSION Rare cases of EBV LPD during therapy with 6-MP are reported in patients with leukemia, but no data about TPMT pharmacogenomics are available. In contrast the disease development in the presented case may be explained by the iatrogenic immunosuppression in the context of TPMT deficiency. While using 6-MP testing of genetic variations is not required for every protocol, although the use of thiopurines in patients with TPMT deficiency can cause severe immunosuppression. Our case suggests that insufficient degradation of 6-MP can have significant consequences despite dose reduction. CONCLUSION When using thiopurines, TPMT genetics should be initiated and strict drug monitoring and dose adjusting must be performed by a specialized center.
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Affiliation(s)
- Lara Müller-Scholden
- Pediatric Oncology, Hematology and Stem Cell Transplantation Program, University Children's Hospital Würzburg, Würzburg, Germany
| | - Frank Deinlein
- Pediatric Oncology, Hematology and Stem Cell Transplantation Program, University Children's Hospital Würzburg, Würzburg, Germany
| | - Matthias Eyrich
- Pediatric Oncology, Hematology and Stem Cell Transplantation Program, University Children's Hospital Würzburg, Würzburg, Germany
| | - Paul Gerhardt Schlegel
- Pediatric Oncology, Hematology and Stem Cell Transplantation Program, University Children's Hospital Würzburg, Würzburg, Germany
| | - Verena Wiegering
- Pediatric Oncology, Hematology and Stem Cell Transplantation Program, University Children's Hospital Würzburg, Würzburg, Germany
| | - Matthias Wölfl
- Pediatric Oncology, Hematology and Stem Cell Transplantation Program, University Children's Hospital Würzburg, Würzburg, Germany
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