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David A, Fernandez A, Menard ML, Dor E, Leali G, Maria F, Cruzel C, Askenazy F, Verstuyft C, Thümmler S. [Pharmacoresistance to psychotropic drugs in children and adolescents: Pharmacogenetic anomalies of cytochrome P450 2D6]. Encephale 2021; 47:227-234. [PMID: 33551122 DOI: 10.1016/j.encep.2020.09.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 09/04/2020] [Accepted: 09/28/2020] [Indexed: 11/19/2022]
Abstract
OBJECTIVES Some patients in child and adolescent psychiatry present resistance to psychotropic drugs, often resulting in polytherapy, an increased risk of adverse events, and more frequent and longer hospitalisation. Psychotropic drugs are mainly metabolised in the liver, in particular by the CYP2D6 subunit of cytochrome P450. Anomalies such as a duplication of the CYP2D6 gene related to an ultra-rapid metaboliser phenotype has been described to be linked to clinical efficacy. However, little research has been done in child and adolescent psychiatry. METHODS A multi-centric cross-sectional study in the southeast of France explored the relation between pharmaco-resistance to psychotropic drugs and the prevalence of duplications or polymorphisms of CYP2D6 associated with an ultra-rapid phenotype in children and adolescents with severe mental health disease. RESULTS Twenty-two patients have been included. The presence of an ultra-rapid phenotype concerns one patient in our study. A second patient presents a slow metaboliser phenotype. CONCLUSIONS This study allows a clinical characterisation of the population of pediatric drug-resistant patients whose severity and the impact of their pathology are major and require long-term care associated with repeated hospitalisations, multiple drug prescriptions and numerous side effects. However, a link between drug resistance to psychotropic drugs and CYP2D6 UFM abnormalities could not be confirmed. An additional pharmacogenetic analysis by a panel of genes applied in the metabolism, transport and action of psychotropic drugs should be considered to answer questions about the resistance and independent effects of CYP2D6.
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Affiliation(s)
- A David
- Service universitaire de psychiatrie de l'enfant et de l'adolescent, hôpitaux pédiatriques de Nice CHU-Lenval, 57, avenue de la Californie, 06200 Nice, France
| | - A Fernandez
- Service universitaire de psychiatrie de l'enfant et de l'adolescent, hôpitaux pédiatriques de Nice CHU-Lenval, 57, avenue de la Californie, 06200 Nice, France; Université Côte d'Azur, CoBTek, FRIS, Nice, France
| | - M-L Menard
- Service universitaire de psychiatrie de l'enfant et de l'adolescent, hôpitaux pédiatriques de Nice CHU-Lenval, 57, avenue de la Californie, 06200 Nice, France; Université Côte d'Azur, CoBTek, FRIS, Nice, France
| | - E Dor
- Service universitaire de psychiatrie de l'enfant et de l'adolescent, hôpitaux pédiatriques de Nice CHU-Lenval, 57, avenue de la Californie, 06200 Nice, France; Université Côte d'Azur, CoBTek, FRIS, Nice, France
| | - G Leali
- Service de psychiatrie de l'enfant, hôpitaux pédiatriques de Nice, CHU-Lenval, 06200 Nice, France
| | - F Maria
- Service universitaire de psychiatrie de l'enfant et de l'adolescent, hôpitaux pédiatriques de Nice CHU-Lenval, 57, avenue de la Californie, 06200 Nice, France
| | - C Cruzel
- Délégation à la recherche clinique et à l'innovation, CHU de Nice, 06000 Nice, France
| | - F Askenazy
- Service universitaire de psychiatrie de l'enfant et de l'adolescent, hôpitaux pédiatriques de Nice CHU-Lenval, 57, avenue de la Californie, 06200 Nice, France; Université Côte d'Azur, CoBTek, FRIS, Nice, France
| | - C Verstuyft
- Service de génétique moléculaire, pharmacogénétique et hormonologie, centre de ressource biologie Paris-Sud, hôpital Bicêtre, groupe hospitalier Paris Sud, AP-HP, Le Kremlin Bicêtre, France; Université Paris-Sud, CESP/UMR-S1178, Équipe "dépression et antidépresseurs", Faculté de médecine, Université Paris-Sud, Inserm, 78, rue Général-Leclerc, 94270 Le Kremlin-Bicêtre, Paris, France
| | - S Thümmler
- Service universitaire de psychiatrie de l'enfant et de l'adolescent, hôpitaux pédiatriques de Nice CHU-Lenval, 57, avenue de la Californie, 06200 Nice, France; Université Côte d'Azur, CoBTek, FRIS, Nice, France.
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Marquot G, Frison C, Lebel D, Bussières JF, Métras MÉ. [Recommendations for performing pharmacogenetic tests in drug monographs in Canada, France and the United States]. Ann Pharm Fr 2020; 78:447-457. [PMID: 32777298 DOI: 10.1016/j.pharma.2020.07.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 05/22/2020] [Accepted: 07/29/2020] [Indexed: 11/19/2022]
Abstract
INTRODUCTION Pharmacogenetics represents an opportunity in pharmaceutical practice. There are many documentary resources to support the pharmacist's work in this area. OBJECTIVE To compare the recommendations for carrying out pharmacogenetic tests from a documentary source in three countries: the United States, Canada and United France. METHOD This is a cross-sectional descriptive study. Based on the recommendations of the Clinical Pharmacogenetics Implementation Consortium type A (the highest threshold justifying the use of a pharmacogenetic test), we identified the drug-gene pairs (23 pairs). The proposed pairs involve a total of 47 separate international nonproprietary names and 18 genes. For each drug-gene pair, we consulted three open access documentary sources (one for each target country), namely the pharmaceutical products database (DPD) for Canada, the product characteristic summary (SPC) for France and the Micromedex® monograph (IBM, Truven Health Analytics, MI, USA) for the United States. The study was conducted in September 2019. RESULTS About a third of the drug-gene pairs are explicitly mentioned by the gene to be targeted and by the test suggested in the documentary sources consulted. Of the 23 pairs identified by the CPIC, thirteen pairs contain "consistent" recommendations between the three documentary sources. CONCLUSION There is great heterogeneity regarding the recommendations for pharmacogenetic tests from three documentary sources used by pharmacists to monitor drug therapy in the United States, Canada and France. There is an urgent need to standardize the requirements for nomenclature, description and the need to use pharmacogenetic tests to ensure proper use of drugs and these tests in the clinic.
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Affiliation(s)
- G Marquot
- Unité de recherche en pratique pharmaceutique, CHU Sainte-Justine, Montréal, Québec, Canada
| | - C Frison
- Unité de recherche en pratique pharmaceutique, CHU Sainte-Justine, Montréal, Québec, Canada
| | - D Lebel
- Unité de recherche en pratique pharmaceutique, CHU Sainte-Justine, Montréal, Québec, Canada
| | - J-F Bussières
- Unité de recherche en pratique pharmaceutique, CHU Sainte-Justine, Montréal, Québec, Canada; Faculté de pharmacie, Université de Montréal, Montréal, Québec, Canada.
| | - M-É Métras
- Unité de recherche en pratique pharmaceutique, CHU Sainte-Justine, Montréal, Québec, Canada
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Barin-Le Guellec C, Picard N, Alarcan H, Barreau M, Becquemont L, Quaranta S, Boyer JC, Loriot MA. [Pharmacogenetics for patient care in France: A discipline that evolves!]. Therapie 2019; 75:459-470. [PMID: 31767126 DOI: 10.1016/j.therap.2019.09.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2019] [Revised: 08/12/2019] [Accepted: 09/24/2019] [Indexed: 12/19/2022]
Abstract
Pharmacogenetics, which concepts are known for a long time, is entering a new period at least as far as its practical applications for patients are concerned. In recent years there have been more and more initiatives to promote widespread dissemination, and health authorities are increasingly incorporating these concepts into drug labels. In France, the national network of pharmacogenetics (RNPGx) works to promote these activities, both with health actors (biologists, clinicians) and health authorities. This article reviews the current situation in France and the milestones of the year 2018. It highlights recent advances in this field, in terms of currently recommended analyses, sharing of information or technological developments, and the prospects for future developments in the near future from targeted pharmacogenetics to eventually preemptive approaches.
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Affiliation(s)
- Chantal Barin-Le Guellec
- Inserm U1248, laboratoire de biochimie et biologie moléculaire, université de Tours, CHU de tours, 2, boulevard Tonnellé, 37044 Tours cedex, France.
| | - Nicolas Picard
- Inserm U1248, service de pharmacologie et toxicologie, université de Limoges, CHU de Limoges, 87042 Limoges, France
| | - Hugo Alarcan
- Inserm U1248, laboratoire de biochimie et biologie moléculaire, université de Tours, CHU de tours, 2, boulevard Tonnellé, 37044 Tours cedex, France
| | - Melody Barreau
- Inserm U1107, Service de pharmacologie, université d'Auvergne, CHU de Clermont-Ferrand, 63001 Clermont-Ferrand, France
| | - Laurent Becquemont
- CESP/Inserm U1018, Centre de recherche clinique, hôpital Bicêtre, université Paris Sud, 94275 Le Kremlin-Bicêtre, France
| | - Sylvie Quaranta
- Laboratoire de pharmacocinétique et toxicologie, CHU Timone, 13005 Marseille, France
| | | | - Marie-Anne Loriot
- Inserm U1144, service de biochimie, hôpital européen Georges-Pompidou, université Paris Descartes, 75015 Paris, France
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Loriot MA, Ciccolini J, Thomas F, Barin-Le-Guellec C, Royer B, Milano G, Picard N, Becquemont L, Verstuyft C, Narjoz C, Schmitt A, Bobin-Dubigeon C, Harle A, Paci A, Poinsignon V, Quaranta S, Evrard A, Hennart B, Broly F, Fonrose X, Lafay-Chebassier C, Wozny AS, Masskouri F, Boyer JC, Etienne-Grimaldi MC. [Dihydropyrimidine déhydrogenase (DPD) deficiency screening and securing of fluoropyrimidine-based chemotherapies: Update and recommendations of the French GPCO-Unicancer and RNPGx networks]. Bull Cancer 2018; 105:397-407. [PMID: 29486921 DOI: 10.1016/j.bulcan.2018.02.001] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Revised: 02/04/2018] [Accepted: 02/06/2018] [Indexed: 11/21/2022]
Abstract
Fluoropyrimidines (FU) are still the most prescribed anticancer drugs for the treatment of solid cancers. However, fluoropyrimidines cause severe toxicities in 10 to 40% of patients and toxic deaths in 0.2 to 0.8% of patients, resulting in a real public health problem. The main origin of FU-related toxicities is a deficiency of dihydropyrimidine dehydrogenase (DPD), the rate-limiting enzyme of 5-FU catabolism. DPD deficiency may be identified through pharmacogenetics testing including phenotyping (direct or indirect measurement of enzyme activity) or genotyping (detection of inactivating polymorphisms on the DPYD gene). Approximately 3 to 15% of patients exhibit a partial deficiency and 0.1 to 0.5% a complete DPD deficiency. Currently, there is no regulatory obligation for DPD deficiency screening in patients scheduled to receive a fluoropyrimidine-based chemotherapy. Based on the levels of evidence from the literature data and considering current French practices, the Group of Clinical Pharmacology in Oncology (GPCO)-UNICANCER and the French Network of Pharmacogenetics (RNPGx) recommend the following: (1) to screen DPD deficiency before initiating any chemotherapy containing 5-FU or capecitabine; (2) to perform DPD phenotyping by measuring plasma uracil (U) concentrations (possibly associated with dihydrouracil/U ratio), and DPYD genotyping (variants *2A, *13, p.D949V, HapB3); (3) to reduce the initial FU dose (first cycle) according to DPD status, if needed, and further, to consider increasing the dose at subsequent cycles according to treatment tolerance. In France, 17 public laboratories currently undertake routine screening of DPD deficiency.
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Descoeur J, Philibert L, Chalard K, Attal J, Petit P, Klouche K, Olivier M. Success of tardive electroconvulsive therapy sessions after loxapine-induced malignant syndrome in the context of very poor metabolisation. Therapie 2017. [PMID: 28647110 DOI: 10.1016/j.therap.2017.03.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
We report the success of tardive electroconvulsive therapy in a case of loxapine malignant syndrome with catatonia. Loxapine and its metabolites were measured in biological samples by liquid chromatography coupled to tandem mass spectrometry. Genes were studied by sequencing and quantitative polymerase chain reaction (PCR). Plasmatic drug concentrations showed a supratherapeutic concentration of loxapine with a very low 8-hydroxyloxapine/loxapine ratio (range from 0.32 to 0.66, normal value>2 for 100mg) and a very long elimination half-life of loxapine (half-life>140h, normal value from 1 to 4hours). We tried to explain this kinetics by exploring the main pharmacogenes implicated in the metabolism of loxapine. No genetic abnormality for CYP1A2 was observed. The study of associated treatments showed the potential contribution of valproate. Pharmacokinetics and pharmacogenetics investigations revealed a blockade of the CYP1A2 metabolic pathway without genetic abnormalities, probably due to valproate co-medication. Toxicological monitoring of loxapine and its metabolites helped to explain the persistence of symptoms and to adapt the therapeutic management.
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Affiliation(s)
- Juliette Descoeur
- Toxicology laboratory, department of medical pharmacology and toxicology, Lapeyronie hospital, CHRU of Montpellier, 34295 Montpellier cedex 5, France.
| | - Laurent Philibert
- Toxicology laboratory, department of medical pharmacology and toxicology, Lapeyronie hospital, CHRU of Montpellier, 34295 Montpellier cedex 5, France
| | - Kevin Chalard
- Department of anesthesia, hôpital de la colombière, CHU of Montpellier, 34295 Montpellier, France
| | - Jérôme Attal
- Department of adult psychiatry, hôpital de la colombière, CHU of Montpellier, 34295 Montpellier, France
| | - Pierre Petit
- Toxicology laboratory, department of medical pharmacology and toxicology, Lapeyronie hospital, CHRU of Montpellier, 34295 Montpellier cedex 5, France; University of Montpellier, 34000 Montpellier, France
| | - Kada Klouche
- University of Montpellier, 34000 Montpellier, France; Department of critical care, Lapeyronie university hospital, 34295 Montpellier, France
| | - Mathieu Olivier
- Toxicology laboratory, department of medical pharmacology and toxicology, Lapeyronie hospital, CHRU of Montpellier, 34295 Montpellier cedex 5, France; University of Montpellier, 34000 Montpellier, France; UMR 5569 hydrosciences, 34090 Montpellier, France
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Abstract
Pharmacokinetics is the link between genetic data and the use of treatments. It can be use on several relevant aspects in the clinic, including the treatment selection, efficacy or toxicity prediction and the choice of the dose. Pharmacogenetics has been applied in clinical nephrology since a long time by the genetic prediction of azathiorpine associated myelotoxicity. However, despite an extensive literature describing the links between genetics and metabolism and transport of drugs, genetic tests are little used in clinical practice. One reason for this poor implementation is the current lack of evidence of improved clinical outcomes with pharmacogenetic tests. In addition, with an effective therapeutic drug monitoring, it is possible to correct the effect of genotype on the pharmacokinetic differences, thus reducing the usefulness of the assay based on the genotype. The future of pharmacogenetics will be treatment models in which patient characteristics are combined with data on polymorphisms in multiple genes including pharmacodynamic parameters, drug transporter proteins, and predictors of toxicity.
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Affiliation(s)
- Éric Thervet
- Service de néphrologie, département hypertension artérielle, prévention et prise en charge des maladies rénales et cardiovasculaires, hôpital européen Georges-Pompidou, 20, rue Leblanc, 75015 Paris, France.
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Abstract
INTRODUCTION Pharmacogenetics aims to identify the underlying genetic factors participating in the variability of drug response. Indeed, genetic variability at the DNA or RNA levels can directly or indirectly modify the pharmacokinetic or the pharmacodynamic parameters of a drug. The ultimate aim of pharmacogenetics is to move towards a personalised medicine by predicting responders and non-responders, adjusting the dose of the treatment, and identifying individuals at risk of adverse drug effects. METHODS A literature research was performed in which we reviewed all pharmacogenetic studies in neurological disorders including neurodegenerative diseases, multiple sclerosis, stroke and epilepsy. RESULTS Several pharmacogenetic studies have been performed in neurology, bringing insights into the inter-individual drug response variability and in the pathophysiology of neurological diseases. The principal implications of these studies for the management of patients in clinical practice are discussed. CONCLUSION/DISCUSSION Although several genetic factors have been identified in the modification of drug response in neurological disorders, most of them have a marginal predictive effect at the single gene level, suggesting mutagenic interactions as well as other factors related to drug interaction and disease subtypes. Most pharmacogenetic studies deserve further replication in independent populations and, ideally, in pharmacogenetic clinical trials to demonstrate their relevance in clinical practice.
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Affiliation(s)
- J-C Corvol
- Sorbonne universités, UPMC université Paris 06, 4, place Jussieu, 75005 Paris, France; CIC_1422, département des maladies du système nerveux, hôpital Pitié-Salpêtrière, AP-HP, 47, boulevard de l'Hôpital, 75651 Paris cedex 13, France; Inserm, UMR_S1127, ICM, 47, boulevard de l'Hôpital, 75651 Paris cedex 13, France; CNRS, UMR_7225, ICM, 4, place Jussieu, 75005 Paris, France.
| | - D Devos
- Inserm U1171, department of movement disorders and neurology, department of medical pharmacology, university of Lille, CHU Lille, 1, place de Verdun, 59045 Lille cedex, France
| | - J-S Hulot
- Sorbonne universités, UPMC université Paris 06, 4, place Jussieu, 75005 Paris, France; Inserm, UMR_S1166, ICAN, 4, place Jussieu, 75005 Paris, France
| | - L Lacomblez
- Sorbonne universités, UPMC université Paris 06, 4, place Jussieu, 75005 Paris, France; CIC_1422, département des maladies du système nerveux, hôpital Pitié-Salpêtrière, AP-HP, 47, boulevard de l'Hôpital, 75651 Paris cedex 13, France; Inserm, UMR_S1146, 47, boulevard de l'Hôpital, 75651 Paris cedex 13, France
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