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Haupt LM, Haywood A, Sutherland HG, Yu C, Albury CL, Pharasi A, Zunk M, George R, Griffiths LR, Good P, Hardy J. The effects of OPRM1 118A>G on methadone response in pain management in advanced cancer at end of life. Sci Rep 2024; 14:3411. [PMID: 38341456 PMCID: PMC10858860 DOI: 10.1038/s41598-024-54009-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2023] [Accepted: 02/07/2024] [Indexed: 02/12/2024] Open
Abstract
Cancer pain is the most feared symptom at end of life. Methadone has advantages over other opioids but is associated with significant variability in clinical response, making dosing challenging in practice. OPRM1 is the most studied pharmacogene associated with the pharmacodynamics of opioids, however reports on the association of the A118G polymorphism on opioid dose requirements are conflicting, with no reports including methadone as the primary intervention. This association study on OPRM1 A118G and response to methadone for pain management, includes a review of this genetic factor's role in inter-patient variability. Fifty-four adult patients with advanced cancer were recruited in a prospective, multi-centre, open label dose individualization study. Patient characteristics were not shown to influence methadone response, and no significant associations were observed for methadone dose or pain score. The findings of our review of association studies for OPRM1 A118G in advanced cancer pain demonstrate the importance of taking ancestry into account. While our sample size was small, our results were consistent with European populations, but in contrast to studies in Chinese patients, where carriers of the A118G polymorphism were associated with higher opioid dose requirements. Pharmacogenetic studies in palliative care are challenging, continued contribution will support future genotype-based drug dosing guidelines.
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Affiliation(s)
- Larisa M Haupt
- Centre for Genomics and Personalised Health, Genomics Research Centre, School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia.
- ARC Training Centre for Cell and Tissue Engineering Technologies, Queensland University of Technology (QUT), Brisbane, Australia.
- Max Planck Queensland Centre for the Materials Sciences of Extracellular Matrices, Brisbane, Australia.
| | - Alison Haywood
- School of Pharmacy and Medical Sciences, Griffith University, Gold Coast, Australia.
- Mater Research Institute-The University of Queensland, Brisbane, Australia.
| | - Heidi G Sutherland
- Centre for Genomics and Personalised Health, Genomics Research Centre, School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Chieh Yu
- Centre for Genomics and Personalised Health, Genomics Research Centre, School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
- Department of Cell and Tissue Biology, University of California, San Francisco, USA
| | - Cassie L Albury
- Centre for Genomics and Personalised Health, Genomics Research Centre, School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Anushka Pharasi
- School of Pharmacy and Medical Sciences, Griffith University, Gold Coast, Australia
| | - Mathew Zunk
- School of Pharmacy and Medical Sciences, Griffith University, Gold Coast, Australia
| | - Rani George
- School of Pharmacy and Medical Sciences, Griffith University, Gold Coast, Australia
- Cancer Trials Unit, Division of Cancer Services, Metro South Health, Brisbane, Australia
| | - Lyn R Griffiths
- Centre for Genomics and Personalised Health, Genomics Research Centre, School of Biomedical Sciences, Queensland University of Technology, Brisbane, Australia
| | - Phillip Good
- Mater Research Institute-The University of Queensland, Brisbane, Australia
- Department of Palliative Care, St Vincent's Private Hospital, Brisbane, Australia
| | - Janet Hardy
- Mater Research Institute-The University of Queensland, Brisbane, Australia
- Department of Palliative and Supportive Care, Mater Health, Brisbane, Australia
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Turczynowicz A, Jakubów P, Niedźwiecka K, Kondracka J, Pużyńska W, Tałałaj M, Guszczyn T, Grabala P, Kowalczuk O, Kocańda S. Mu-Opioid Receptor 1 and C-Reactive Protein Single Nucleotide Polymorphisms as Biomarkers of Pain Intensity and Opioid Consumption. Brain Sci 2023; 13:1629. [PMID: 38137077 PMCID: PMC10741726 DOI: 10.3390/brainsci13121629] [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: 10/23/2023] [Revised: 11/13/2023] [Accepted: 11/20/2023] [Indexed: 12/24/2023] Open
Abstract
Children constitute a special group in pain therapy. Single nucleotide polymorphisms that are associated with differences in postoperative, inflammatory pain perception and opioid requirement are the A118G SNP in the mu-opioid receptor 1 (OPRM1) gene and the rs1205 CRP. This study aimed to determine connection between OPRM1 and rs1205 CRP SNPs in pediatric patients postoperatively and pain intensity, the opioid dose needed to control pain after scoliosis correction, and other clinical aspects. Genotypes of rs1205 CRP and OPRM1 polymorphisms in a sample of 31 patients were specified, and statistical analysis was performed in terms of age, genotype frequency, pain assessment, sufentanil flow, post-anesthesia care unit stay, and the use of coanalgesics. The frequency of A/A and A/G genotypes in the OPRM1 gene was in line with 1000Genomes data for the European population. Patients from the AG group of OPRM1 SNP more frequently required coanalgesics for adequate pain control; however, it was of weak statistical significance. Other parameters measured in the study were not statistically significant in relation to OPRM1 and CRP polymorphisms. The effect of SNPs on postoperative pain management and opioid therapy in children was not confirmed by this study. An expansion of the study sample and other opioid-related SNPs is required.
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Affiliation(s)
- Aleksander Turczynowicz
- Department of Anesthesiology and Intensive Care for Children and Adolescents with Postoperative and Pain Treatment Unit, Medical University of Bialystok, 15-274 Bialystok, Poland; (P.J.); (J.K.); (M.T.)
| | - Piotr Jakubów
- Department of Anesthesiology and Intensive Care for Children and Adolescents with Postoperative and Pain Treatment Unit, Medical University of Bialystok, 15-274 Bialystok, Poland; (P.J.); (J.K.); (M.T.)
| | - Karolina Niedźwiecka
- Department of Cardiosurgery, Medical University of Bialystok, 15-276 Bialystok, Poland; (K.N.)
| | - Julia Kondracka
- Department of Anesthesiology and Intensive Care for Children and Adolescents with Postoperative and Pain Treatment Unit, Medical University of Bialystok, 15-274 Bialystok, Poland; (P.J.); (J.K.); (M.T.)
| | - Weronika Pużyńska
- Department of Palliative Medicine, Medical University of Bialystok, 15-276 Bialystok, Poland;
| | - Mariola Tałałaj
- Department of Anesthesiology and Intensive Care for Children and Adolescents with Postoperative and Pain Treatment Unit, Medical University of Bialystok, 15-274 Bialystok, Poland; (P.J.); (J.K.); (M.T.)
| | - Tomasz Guszczyn
- Department of Pediatric Orthopedics and Traumatology, Medical University of Bialystok, 15-274 Bialystok, Poland; (T.G.); (P.G.)
| | - Paweł Grabala
- Department of Pediatric Orthopedics and Traumatology, Medical University of Bialystok, 15-274 Bialystok, Poland; (T.G.); (P.G.)
| | - Oksana Kowalczuk
- Department of Clinical Molecular Biology, Medical University of Bialystok, 15-269 Bialystok, Poland
| | - Szymon Kocańda
- Department of Cardiosurgery, Medical University of Bialystok, 15-276 Bialystok, Poland; (K.N.)
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Polymorphisms in COMT and OPRM1 Collectively Contribute to Chronic Shoulder Pain and Disability in South African Breast Cancer Survivors'. Genes (Basel) 2022; 14:genes14010009. [PMID: 36672750 PMCID: PMC9858584 DOI: 10.3390/genes14010009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2022] [Revised: 12/12/2022] [Accepted: 12/16/2022] [Indexed: 12/24/2022] Open
Abstract
Chronic shoulder pain and disability is a common adverse effect experienced by >40% of breast cancer survivors (BCS). Pain management protocols for acute and chronic pain include the use of opioids and opioid derivatives. Furthermore, pain-modulating genes, such as COMT and OPRM1, have been linked to the aetiology of chronic pain. This study aimed to investigate the association between genetic variants of major pain modulator genes and chronic pain/disability in BCS. Assessment of pain, disability and combined (pain and disability) symptoms were determined using the Shoulder Pain and Disability Index (SPADI). Participants were grouped according to their scores such as no-low (<30%) and moderate-high (≥30%) groups of pain, disability and combined (pain and disability). Genotyping of the COMT rs6269 (A > G), rs4633 (C > T), rs4818 (C > G) and the functional rs4680(G > A) SNPs within the BCS (N = 252) cohort were conducted using TaqMan® SNP assays. Genotype, allele, haplotype, and allele-allele combination frequencies were evaluated. Statistical analysis was applied, with significance accepted at p < 0.05. The COMT rs4680:A/A genotype was significantly associated with moderate-high pain (p = 0.024, OR: 3.23, 95% CI: 1.33-7.81) and combined (pain and disability) (p = 0.015, OR: 3.81, 95% CI: 1.47-9.85). The rs4680:A allele was also significantly associated with moderate-high pain (p = 0.035, OR: 1.58, 95% CI: 1.03-2.43) and combined (pain and disability) (p = 0.017, OR: 1.71, 95% CI: 1.07-2.71). For the inferred COMT (rs6269 A > G-rs4680 G > A) haplotype analyses, the G-G (p = 0.026, OR: 0.67, 95% CI: 0.38-1.18) and A-A (p = 0.007, OR: 2.09, 95% CI: 0.89-4.88) haplotypes were significantly associated with reduced and increased likelihoods of reporting moderate-high pain, respectively. The inferred A-A (p = 0.003, OR: 2.18, 95% CI: 0.92-5.17) haplotype was also significantly associated with combined (pain and disability). Gene-gene interaction analyses further showed allele-allele combinations for COMT (rs4680 G > A)-OPRM1 (rs1799971 A > G) and COMT (rs4680 G > A)-OPRM1(rs540825 T > A) were associated with reporting pain and combined (pain and disability) symptoms, p < 0.05. The findings of this study suggest that COMT and OPRM1 SNPs play a role in the development of chronic shoulder pain/disability in BCS in a unique South African cohort from the Western Cape.
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Association of KCNJ6 rs2070995 and methadone response for pain management in advanced cancer at end-of-life. Sci Rep 2022; 12:17422. [PMID: 36261449 PMCID: PMC9582209 DOI: 10.1038/s41598-022-21180-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Accepted: 09/23/2022] [Indexed: 01/12/2023] Open
Abstract
Opioids are the therapeutic agents of choice to manage moderate to severe pain in patients with advanced cancer, however the unpredictable inter-individual response to opioid therapy remains a challenge for clinicians. While studies are few, the KCNJ6 gene is a promising target for investigating genetic factors that contribute to pain and analgesia response. This is the first association study on polymorphisms in KCNJ6 and response to methadone for pain management in advanced cancer. Fifty-four adult patients with advanced cancer were recruited across two study sites in a prospective, open label, dose individualisation study. Significant associations have been previously shown for rs2070995 and opioid response in opioid substitution therapy for heroin addiction and studies in chronic pain, with mixed results seen in postoperative pain. In this study, no associations were shown for rs2070995 and methadone dose or pain score, consistent with other studies conducted in patients receiving opioids for pain in advanced cancer. There are many challenges in conducting studies in advanced cancer with significant attrition and small sample sizes, however it is hoped that the results of our study will contribute to the evidence base and allow for continued development of gene-drug dosing guidelines for clinicians.
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Nishizawa D, Terui T, Ishitani K, Kasai S, Hasegawa J, Nakayama K, Ebata Y, Ikeda K. Genome-Wide Association Study Identifies Candidate Loci Associated with Opioid Analgesic Requirements in the Treatment of Cancer Pain. Cancers (Basel) 2022; 14:cancers14194692. [PMID: 36230616 PMCID: PMC9564079 DOI: 10.3390/cancers14194692] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 09/20/2022] [Accepted: 09/21/2022] [Indexed: 11/29/2022] Open
Abstract
Considerable individual differences have been widely observed in the sensitivity to opioids. We conducted a genome-wide association study (GWAS) in patients with cancer pain to identify potential candidate single-nucleotide polymorphisms (SNPs) that contribute to individual differences in opioid analgesic requirements in pain treatment by utilizing whole-genome genotyping arrays with more than 650,000 markers. The subjects in the GWAS were 428 patients who provided written informed consent and underwent treatment for pain with opioid analgesics in a palliative care unit at Higashi-Sapporo Hospital. The GWAS showed two intronic SNPs, rs1283671 and rs1283720, in the ANGPT1 gene that encodes a secreted glycoprotein that belongs to the angiopoietin family. These two SNPs were strongly associated with average daily opioid requirements for the treatment of pain in both the additive and recessive models (p < 5.0000 × 10−8). Several other SNPs were also significantly associated with the phenotype. In the gene-based analysis, the association was significant for the SLC2A14 gene in the additive model. These results indicate that these SNPs could serve as markers that predict the efficacy of opioid analgesics in cancer pain treatment. Our findings may provide valuable information for achieving satisfactory pain control and open new avenues for personalized pain treatment.
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Affiliation(s)
- Daisuke Nishizawa
- Addictive Substance Project, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan
| | - Takeshi Terui
- Division of Internal Medicine, Department of Medicine, Higashi-Sapporo Hospital, Sapporo 003-8585, Japan
| | - Kunihiko Ishitani
- Division of Internal Medicine, Department of Medicine, Higashi-Sapporo Hospital, Sapporo 003-8585, Japan
| | - Shinya Kasai
- Addictive Substance Project, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan
| | - Junko Hasegawa
- Addictive Substance Project, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan
| | - Kyoko Nakayama
- Addictive Substance Project, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan
| | - Yuko Ebata
- Addictive Substance Project, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan
| | - Kazutaka Ikeda
- Addictive Substance Project, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan
- Correspondence: ; Tel.: +81-3-6834-2379
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Rowe CE, Wong AK, Buizen L, Hawke J, Le B. Do Patient Demographics and Performance Status Influence Opioid Dose in Cancer Pain? Am J Hosp Palliat Care 2022:10499091221123008. [PMID: 36056569 DOI: 10.1177/10499091221123008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Context: There is limited evidence on the role of objective parameters in influencing analgesic use in cancer pain management.Objective: To investigate the significance of objective parameters (age, male/female and performance status) in influencing opioid dose. Methods: We conducted a retrospective cross-sectional audit of adult inpatients with metastatic cancer at a major cancer centre from 1 January 2016 to 31 December 2018, who were prescribed slow release opioids for cancer pain on discharge. Main outcome measures were demographics (age, male/female and performance status), oral morphine equivalent daily dose (oMEDD) and adjuvant analgesic use. Results: Of the 7,747 eligible records, 215 patient records fulfilled inclusion criteria. Older patients (≥75 years) received half of the median oMEDD dose (30 mg) compared to their youngest counterparts (60 mg oMEDD in age ≤50 years) (P = .003). No significant differences were observed between oMEDD and male/female and performance status. Conclusion: Older patients are prescribed half the opioid dose compared to their younger counterparts. This highlights the importance of vigilance in opioid prescribing in the elderly in order to balance side effects with under treatment. Although no other significant relationships were observed, future studies comparing objective patient parameters with opioid prescription may uncover other at risk populations.
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Affiliation(s)
| | - Aaron K Wong
- 90134The Royal Melbourne Hospital, Parkville, VIC, AU
| | - Luke Buizen
- 90134The Royal Melbourne Hospital, Parkville, VIC, AU
| | - Justin Hawke
- 90134The Royal Melbourne Hospital, Parkville, VIC, AU
| | - Brian Le
- 90134The Royal Melbourne Hospital, Parkville, VIC, AU
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Ozberk D, Haywood A, Sutherland HG, Yu C, Albury CL, Zunk M, George R, Good P, Griffiths LR, Hardy J, Haupt LM. Association of polymorphisms in ARRB2 and clinical response to methadone for pain in advanced cancer. Pharmacogenomics 2022; 23:281-289. [PMID: 35189719 DOI: 10.2217/pgs-2021-0139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Background: The prescription of methadone in advanced cancer poses multiple challenges due to the considerable interpatient variation seen in effective dose and toxicity. Previous reports have suggested that ARRB2 influences the response to methadone in opioid substitution therapy. Associations with opioid response for pain management in advanced cancer are conflicting, with no studies including methadone as the primary intervention. Methods: In a prospective, multicenter, open-label dose individualization study, we investigated whether polymorphisms in ARRB2 were associated with methadone dose requirements and pain severity. Results: Significant associations were found for rs3786047, rs1045280, rs2036657 and pain score. Conclusion: While studies are few and the sample size small, ARRB2 genotyping may assist in individualized management of the most feared symptom in advanced cancer.
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Affiliation(s)
- Deniz Ozberk
- School of Pharmacy & Medical Sciences, Griffith University, Gold Coast campus, QLD, 4222, Australia
| | - Alison Haywood
- School of Pharmacy & Medical Sciences, Griffith University, Gold Coast campus, QLD, 4222, Australia.,Mater Research Institute, The University of Queensland, South Brisbane, QLD, 4101, Australia
| | - Heidi G Sutherland
- Centre for Genomics & Personalised Health, Genomics Research Centre, School of Biomedical Sciences, Queensland University of Technology, Brisbane, QLD, 4001, Australia
| | - Chieh Yu
- Centre for Genomics & Personalised Health, Genomics Research Centre, School of Biomedical Sciences, Queensland University of Technology, Brisbane, QLD, 4001, Australia.,Department of Cell & Tissue Biology, University of California, San Francisco, CA 94143, USA
| | - Cassie L Albury
- Centre for Genomics & Personalised Health, Genomics Research Centre, School of Biomedical Sciences, Queensland University of Technology, Brisbane, QLD, 4001, Australia
| | - Mathew Zunk
- School of Pharmacy & Medical Sciences, Griffith University, Gold Coast campus, QLD, 4222, Australia
| | - Rani George
- School of Pharmacy & Medical Sciences, Griffith University, Gold Coast campus, QLD, 4222, Australia.,Cancer Trials Unit, Division of Cancer Services, Metro South Health, Woolloongabba, QLD, 4102, Australia
| | - Phillip Good
- Mater Research Institute, The University of Queensland, South Brisbane, QLD, 4101, Australia.,Department of Palliative Care, St Vincent's Private Hospital, Kangaroo Point, QLD, 4169, Australia.,Department of Palliative & Supportive Care, Mater Health, South Brisbane, QLD, 4101, Australia
| | - Lyn R Griffiths
- Centre for Genomics & Personalised Health, Genomics Research Centre, School of Biomedical Sciences, Queensland University of Technology, Brisbane, QLD, 4001, Australia
| | - Janet Hardy
- Mater Research Institute, The University of Queensland, South Brisbane, QLD, 4101, Australia.,Department of Palliative & Supportive Care, Mater Health, South Brisbane, QLD, 4101, Australia
| | - Larisa M Haupt
- Centre for Genomics & Personalised Health, Genomics Research Centre, School of Biomedical Sciences, Queensland University of Technology, Brisbane, QLD, 4001, Australia
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Genetic and Clinical Factors Associated with Opioid Response in Chinese Han Patients with Cancer Pain: An Exploratory Cross-Sectional Study. Pain Ther 2022; 11:269-288. [PMID: 35107781 PMCID: PMC8861215 DOI: 10.1007/s40122-022-00353-5] [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] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 01/14/2022] [Indexed: 12/20/2022] Open
Abstract
Introduction Studies have shown that genetic variation and environmental factors are associated with individual differences in therapeutic efficacy and side effects of opioids. However, the focus of these studies has been on a single factor of single-nucleotide polymorphisms (SNPs) or haplotypes, for which results have rarely been validated. For complex traits, such as cancer pain and opioid response, interactions between multiple genetic variation and environmental factors need to be considered to explain the opioid individual differences. Methods We conducted an exploratory two-stage cross-sectional study with 1027 Chinese patients who were taking strong opioid medications for their cancer pain, and genotyped 110 SNPs to explore the association of SNPs, haplotypes, gene–gene and gene–environment interactions with opioid dose, pain relief, and opioid-induced constipation. Results Due to the failure to meet Benjamini–Hochberg criteria in the discovery stage or to be validated in replication stage, no association was found between SNPs, haplotypes, paired SNP–SNP interactions or multi-dimensional gene–gene interactions and opioid response. However, for gene–environment interactions, optimal models have been constructed in all phenotypes of opioid response. Conclusions This study reveals for the first time that construction of multidimensional gene–environment interactions enables better interpretations of the effect of genetic variation and environmental factors on the opioid response in patients with cancer pain. Trial registration Chictr.org.cn, identifier, ChiCTR2000033576. Supplementary Information The online version contains supplementary material available at 10.1007/s40122-022-00353-5.
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Magarbeh L, Gorbovskaya I, Le Foll B, Jhirad R, Müller DJ. Reviewing pharmacogenetics to advance precision medicine for opioids. Biomed Pharmacother 2021; 142:112060. [PMID: 34523422 DOI: 10.1016/j.biopha.2021.112060] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Revised: 08/14/2021] [Accepted: 08/16/2021] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Adequate opioid prescribing is critical for therapeutic success of pain management. Despite the widespread use of opioids, optimized opioid therapy remains unresolved with risk of accidental lethal overdosing. With the emergence of accumulating evidence linking genetic variation to opioid response, pharmacogenetic based treatment recommendations have been proposed. OBJECTIVE The aim of this review is to evaluate pharmacogenetic evidence and provide an overview on genes involved in the pharmacokinetics and pharmacodynamics of opioids. METHODS For this review, a systematic literature search of published articles was used in PubMed®, with no language restriction and between the time period of January 2000 to December 2020. We reviewed randomized clinical studies, study cohorts and case reports that investigated the influence of genetic variants on selected opioid pharmacokinetics and pharmacodynamics. In addition, we reviewed current CPIC clinical recommendations for pharmacogenetic testing. RESULTS Results of this review indicate consistent evidence supporting the association between selected genetic variants of CYP2D6 for opioid metabolism. CPIC guidelines include recommendations that indicate the avoidance of tramadol use, in addition to codeine, in CYP2D6 poor metabolizers and ultrarapid metabolizers, and to monitor intermediate metabolizers for less-than-optimal response. While there is consistent evidence for OPRM1 suggesting increased postoperative morphine dosing requirements in A118G G-allele carriers, the clinical relevance remains limited. CONCLUSION There is emerging evidence of clinical relevance of CYP2D6 and, to a lesser extent, OPRM1 polymorphism in personalized opioid drug dosing. As a result, first clinics have started to implement pharmacogenetic guidelines for CYP2D6 and codeine.
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Affiliation(s)
- Leen Magarbeh
- Department of Pharmacology and Toxicology, Temerty Faculty of Medicine, University of Toronto, Toronto, ON, Canada; Centre for Addiction and Mental Health, Toronto, ON, Canada
| | - Ilona Gorbovskaya
- Institute of Medical Sciences, Temerty Faculty of Medicine, University of Toronto, Toronto, ON, Canada; Centre for Addiction and Mental Health, Toronto, ON, Canada
| | - Bernard Le Foll
- Department of Pharmacology and Toxicology, Temerty Faculty of Medicine, University of Toronto, Toronto, ON, Canada; Department of Psychiatry, Temerty Faculty of Medicine, University of Toronto, Toronto, ON, Canada; Department of Family and Community Medicine, Temerty Faculty of Medicine, University of Toronto, Toronto, ON, Canada; Centre for Addiction and Mental Health, Toronto, ON, Canada; Translational Addiction Research Laboratory, Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, ON, Canada; Acute Care Program, Centre for Addiction and Mental Health, Toronto, ON, Canada; Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada
| | - Reuven Jhirad
- Dalla Lana School of Public Health, University of Toronto, Toronto, ON, Canada; Office of the Chief Coroner and Ontario Forensic Pathology Service, Toronto, ON, Canada
| | - Daniel J Müller
- Department of Pharmacology and Toxicology, Temerty Faculty of Medicine, University of Toronto, Toronto, ON, Canada; Department of Psychiatry, Temerty Faculty of Medicine, University of Toronto, Toronto, ON, Canada; Institute of Medical Sciences, Temerty Faculty of Medicine, University of Toronto, Toronto, ON, Canada; Centre for Addiction and Mental Health, Toronto, ON, Canada.
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Slepukhina MA, Ivashchenko DV, Sheina MA, Muradian AA, Blagovestnov DA, Sychev DA. Pain pharmacogenetics. Drug Metab Pers Ther 2020; 35:dmpt-2020-2939. [PMID: 32776897 DOI: 10.1515/dmpt-2020-2939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Accepted: 03/16/2020] [Indexed: 11/15/2022]
Abstract
Pain is a significant problem in medicine. The use of PGx markers to personalize postoperative analgesia can increase its effectiveness and avoid undesirable reactions. This article describes the mechanisms of nociception and antinociception and shows the pathophysiological mechanisms of pain in the human body. The main subject of this article is pharmacogenetic approach to the selection of anesthetics. Current review presents data for local and general anesthetics, opioids, and non-steroidal anti-inflammatory drugs. None of the anesthetics currently has clinical guidelines for pharmacogenetic testing. This literature review summarizes the results of original research available, to date, and draws attention to this area.
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Affiliation(s)
| | - Dmitriy V Ivashchenko
- Child Psychiatry and Psychotherapy Department, Department of Personalized Medicine, Russian Medical Academy of Continuous Professional Education, Moscow, Russia
| | - Maria A Sheina
- Department of Anesthesiology and Intensive Care, I.M. Sechenov First Moscow State Medical University, Moscow, Russia
| | | | | | - Dmitriy A Sychev
- Department of Clinical Pharmacology and Therapeutics, Russian Medical Academy of Continuous Professional Education, Moscow, Russia
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Bugada D, Lorini LF, Fumagalli R, Allegri M. Genetics and Opioids: Towards More Appropriate Prescription in Cancer Pain. Cancers (Basel) 2020; 12:cancers12071951. [PMID: 32708424 PMCID: PMC7409018 DOI: 10.3390/cancers12071951] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Accepted: 07/16/2020] [Indexed: 12/26/2022] Open
Abstract
Opioids are extensively used in patients with cancer pain; despite their efficacy, several patients can experience ineffective analgesia and/or side effects. Pharmacogenetics is a new approach to drug prescription based on the “personalized-medicine” concept, i.e., the ability of tailoring treatments to each individual’s genetic/genomic profile. Pharmacogenetics aims to identify specific genetic variants that influence pharmacokinetics and pharmacodynamics of drugs, better determining their effectiveness/safety profile. Opioid response is a complex scenario, but some gene variants have shown a correlation with pain sensitivity, as well as with opioid metabolism and clinical efficacy/adverse events. Although questions remain unanswered, some of these gene variants may already be used to identify specific patients’ phenotypes that are more prone to experience better clinical response (i.e., better analgesia and/or less adverse events). Once adopted, this approach to opioid prescription may improve a patient’s outcome. This review summarizes the available data on genetic variants and opioid response: we will focus on basic pharmacogenetic and its impact in the clinical scenario discussing how they may lead to more appropriate opioid prescription in cancer patients.
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Affiliation(s)
- Dario Bugada
- Emergency and Intensive Care Department, ASST Papa Giovanni XXIII, 24127 Bergamo, Italy;
- Italian Pain Group;
- Correspondence:
| | - Luca F. Lorini
- Emergency and Intensive Care Department, ASST Papa Giovanni XXIII, 24127 Bergamo, Italy;
| | - Roberto Fumagalli
- School of Medicine and Surgery, University of Milan-Bicocca, 20900 Monza, Italy;
- Department of Anesthesiology, ASST Grande Ospedale Metropolitano Niguarda, 20162 Milan, Italy
| | - Massimo Allegri
- Italian Pain Group;
- Pain Therapy Service—Fondazione Policlinico Monza, 20900 Monza, Italy
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Cornett EM, Carroll Turpin MA, Pinner A, Thakur P, Sekaran TSG, Siddaiah H, Rivas J, Yates A, Huang GJ, Senthil A, Khurmi N, Miller JL, Stark CW, Urman RD, Kaye AD. Pharmacogenomics of Pain Management: The Impact of Specific Biological Polymorphisms on Drugs and Metabolism. Curr Oncol Rep 2020; 22:18. [PMID: 32030524 DOI: 10.1007/s11912-020-0865-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
PURPOSE OF REVIEW Pain is multifactorial and complex, often with a genetic component. Pharmacogenomics is a relative new field, which allows for the development of a truly unique and personalized therapeutic approach in the treatment of pain. RECENT FINDINGS Until recently, drug mechanisms in humans were determined by testing that drug in a population and calculating response averages. However, some patients will inevitably fall outside of those averages, and it is nearly impossible to predict who those outliers might be. Pharmacogenetics considers a patient's unique genetic information and allows for anticipation of that individual's response to medication. Pharmacogenomic testing is steadily making progress in the management of pain by being able to identify individual differences in the perception of pain and susceptibility and sensitivity to drugs based on genetic markers. This has a huge potential to increase efficacy and reduce the incidence of iatrogenic drug dependence and addiction. The streamlining of relevant polymorphisms of genes encoding receptors, transporters, and drug-metabolizing enzymes influencing the pain phenotype can be an important guide to develop safe new strategies and approaches to personalized pain management. Additionally, some challenges still prevail and preclude adoption of pharmacogenomic testing universally. These include lack of knowledge about pharmacogenomic testing, inadequate standardization of the process of data handling, questionable benefits about the clinical and financial aspects of pharmacogenomic testing-guided therapy, discrepancies in clinical evidence supporting these tests, and doubtful reimbursement of the tests by health insurance agencies.
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Affiliation(s)
- Elyse M Cornett
- Department of Anesthesiology, LSU Health Shreveport, 1501 Kings Highway, Shreveport, LA, 71103, USA.
| | - Michelle A Carroll Turpin
- Department of Biomedical Sciences, College of Medicine, University of Houston, Health 2 Building, Room 8037, Houston, TX, USA
| | - Allison Pinner
- Ochsner LSU Health Shreveport, 1501 Kings Highway, Shreveport, LA, 71103, USA
| | - Pankaj Thakur
- Department of Anesthesiology, Ochsner LSU Health Shreveport, 1501 Kings Highway, Shreveport, LA, 71103, USA
| | | | - Harish Siddaiah
- Department of Anesthesiology, Ochsner LSU Health Shreveport, 1501 Kings Highway, Shreveport, LA, 71103, USA
| | - Jasmine Rivas
- Department of Family Medicine, ECU Vidant Medical Center, 101 Heart Drive, Greenville, NC, 27834, USA
| | - Anna Yates
- LSU Health Shreveport School of Medicine, 1501 Kings Highway, Shreveport, LA, 71103, USA
| | - G Jason Huang
- Texas Tech University Health Sciences Center, Lubbock, TX, USA
| | - Anitha Senthil
- Department of Anesthesiology, Lahey Hospital & Medical Center, 41Mall Road, Burlington, MA, 01805, USA
| | - Narjeet Khurmi
- Department of Anesthesiology & Perioperative Medicine, Mayo Clinic Arizona, 5777 East Mayo Boulevard, Phoenix, AZ, 85054, USA
| | - Jenna L Miller
- LSU Health Sciences Center New Orleans, 1901 Perdido Street, New Orleans, LA, 70112, USA
| | - Cain W Stark
- Medical College of Wisconsin, 8701 West Watertown Plank Road, Wauwatosa, WI, 53226, USA
| | - Richard D Urman
- Department of Anesthesiology, Perioperative and Pain Medicine, Harvard Medical School, Brigham and Women's Hospital, 75 Francis St, Boston, MA, 02115, USA
| | - Alan David Kaye
- Department of Anesthesiology and Pharmacology, Toxicology, and Neurosciences, Louisiana State University School of Medicine, 1501 Kings Hwy, Shreveport, LA, 71103, USA
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Abstract
AbstractAlthough there is a plethora of cancer associated-factors that can ultimately culminate in death (cachexia, organ impairment, metastases, opportunistic infections, etc.), the focal element of every terminal malignancy is the failure of our natural defences to control unlimited cell proliferation. The reasons why our defences apparently lack efficiency is a complex question, potentially indicating that, under Darwinian terms, solutions other than preventing cancer progression are also important contributors. In analogy with host-parasite systems, we propose to call this latter option ‘tolerance’ to cancer. Here, we argue that the ubiquity of oncogenic processes among metazoans is at least partially attributable to both the limitations of resistance mechanisms and to the evolution of tolerance to cancer. Deciphering the ecological contexts of alternative responses to the cancer burden is not a semantic question, but rather a focal point in understanding the evolutionary ecology of host-tumour relationships, the evolution of our defences, as well as why and when certain cancers are likely to be detrimental for survival.
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Bach-Rojecky L, Vađunec D, Lozić M, Žunić K, Špoljar GG, Čutura T, Erceg D, Primorac D. Challenges in anesthesia personalization: resolving the pharmacogenomic puzzle. Per Med 2019; 16:511-525. [DOI: 10.2217/pme-2019-0056] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Clinicians are witnessing differences in the doses required for induction and maintenance of anesthesia, as well as prolonged recovery in some patients. Predictable factors like patient characteristics, factors related to the procedure, pharmacological characteristics of anesthetics and adjunctive drugs, might explain some of the observed differences. However, the role of various polymorphisms of genes encoding for drugs’ molecular targets, transporters and metabolic enzymes can have a significant impact on anesthesia outcome, too. In the present paper, we critically discuss pharmacological characteristics of the most common drugs used in anesthesia, with a focus on the possible genetic background of unpredictable diversities in anesthesia outcomes.
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Affiliation(s)
- Lidija Bach-Rojecky
- Department of Pharmacology, University of Zagreb Faculty of Pharmacy & Biochemistry, Zagreb 10000, Croatia
| | - Dalia Vađunec
- Department of Pharmacology, University of Zagreb Faculty of Pharmacy & Biochemistry, Zagreb 10000, Croatia
| | - Marin Lozić
- Department of Anesthesia & ICU Care of Neurosurgical Patients, Clinic for Anesthesia & Intensive Care, University Clinical Hospital Zagreb, Zagreb 10000, Croatia
| | | | | | - Tomislav Čutura
- St. Catherine Specialty Hospital, Zagreb 10000 & Zabok 49210, Croatia
| | - Damir Erceg
- St. Catherine Specialty Hospital, Zagreb 10000 & Zabok 49210, Croatia
- Croatian Catholic University, Zagreb 10000, Croatia
- Srebrnjak Children's Hospital, Zagreb 10000, Croatia
- University Josip Juraj Strossmayer Faculty of Dental Medicine & Health, School of Medicine, Osijek 31000, Croatia
- University Josip Juraj Strossmayer School of Medicine, Osijek 31000, Croatia
| | - Dragan Primorac
- St. Catherine Specialty Hospital, Zagreb 10000 & Zabok 49210, Croatia
- University Josip Juraj Strossmayer Faculty of Dental Medicine & Health, School of Medicine, Osijek 31000, Croatia
- University Josip Juraj Strossmayer School of Medicine, Osijek 31000, Croatia
- Eberly College of Science, State College, Penn State University, PA 16802, USA
- The Henry C. Lee College of Criminal Justice & Forensic Sciences, University of New Haven, West Haven, CT 06516, USA
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Margarit C, Roca R, Inda MDM, Muriel J, Ballester P, Moreu R, Conte AL, Nuñez A, Morales D, Peiró AM. Genetic Contribution in Low Back Pain: A Prospective Genetic Association Study. Pain Pract 2019; 19:836-847. [PMID: 31269327 DOI: 10.1111/papr.12816] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 05/19/2019] [Accepted: 06/06/2019] [Indexed: 11/25/2022]
Abstract
OBJECTIVES Chronic pain is one of the most common reasons individuals seek medical attention. It is a major issue because of the wide interindividual variability in the analgesic response. This might be partly explained by the presence of variants in genes encoding molecules involved in pharmacodynamics and pharmacokinetics. The aim was to analyze opioid effectiveness in chronic low back pain (CLBP) relief after opioid titration, unveiling the impact of pharmacogenetics. METHODS The study included 231 opioid-naïve patients from the Spine Unit; age 63 ± 14 years, 64% female, body mass index 29 ± 6 kg/m2 , visual analog scale pain intensity score 73 ± 16 mm. Clinical data were collected at baseline, 3 months after opioid titration, and after 2 to 4 years of follow-up concerning pain (intensity and relief), quality of life, disability, comorbidities, and drug prescription (opioid dose, rotations, and adverse events). The genotype influence of OPRM1, COMT, UGT2B7, ABCB1, KCNJ6, and CYP3A5*3A in analgesic response was analyzed by reverse-transcription polymerase chain reaction genotyping. RESULTS Patients with the COMT G472A-AA genotype (rs4680) and KCNJ6 A1032G-A allele (rs2070995) CLBP responded differently to opioid titration, with higher pain intensity requiring higher dosing. Furthermore, GG- genotypes of A118G (OPRM1, rs1799971) and A854G (UGT2B7, rs776746) influenced the neuropathic component. After opioid titration, CLBP intensity, neuropathic component, low back pain disability, anxiety, and depression significantly decreased, while quality of life improved. CONCLUSION Single-nucleotide polymorphisms in genes involved in pain transmission and opioid metabolism might predispose to exaggerated sensitivity and differences in the opioid analgesic effect in patients with CLBP. We encourage clinical trials for their clinical application in chronic pain management.
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Affiliation(s)
- César Margarit
- Pain Unit, Department of Health of Alicante, Alicante General Hospital, Alicante, Spain.,Neuropharmacology in Pain (NED) Group, Alicante Institute for Health and Biomedical Research (ISABIAL-FISABIO Foundation), Alicante, Spain
| | - Reyes Roca
- Neuropharmacology in Pain (NED) Group, Alicante Institute for Health and Biomedical Research (ISABIAL-FISABIO Foundation), Alicante, Spain
| | - María-Del-Mar Inda
- Neuropharmacology in Pain (NED) Group, Alicante Institute for Health and Biomedical Research (ISABIAL-FISABIO Foundation), Alicante, Spain
| | - Javier Muriel
- Neuropharmacology in Pain (NED) Group, Alicante Institute for Health and Biomedical Research (ISABIAL-FISABIO Foundation), Alicante, Spain
| | - Pura Ballester
- Neuropharmacology in Pain (NED) Group, Alicante Institute for Health and Biomedical Research (ISABIAL-FISABIO Foundation), Alicante, Spain
| | - Rocío Moreu
- Clinical Pharmacology Unit, Department of Health of Alicante, Alicante General Hospital, Alicante, Spain
| | - Anna Lucia Conte
- Occupational Observatory, Miguel Hernández University of Elche, Alicante, Spain
| | - Angela Nuñez
- Operations Research Center, Miguel Hernández University of Elche, Elche, Spain
| | - Domingo Morales
- Operational Centre, Miguel Hernandez University, Elche, Spain
| | - Ana M Peiró
- Pain Unit, Department of Health of Alicante, Alicante General Hospital, Alicante, Spain.,Neuropharmacology in Pain (NED) Group, Alicante Institute for Health and Biomedical Research (ISABIAL-FISABIO Foundation), Alicante, Spain.,Clinical Pharmacology Unit, Department of Health of Alicante, Alicante General Hospital, Alicante, Spain
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Bechakra M, Moerdijk F, van Rosmalen J, Koch BC, van der Rijt CC, Sillevis Smitt PA, Jongen JL. Opioid responsiveness of nociceptive versus mixed pain in clinical cancer patients. Eur J Cancer 2018; 105:79-87. [DOI: 10.1016/j.ejca.2018.09.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Revised: 09/22/2018] [Accepted: 09/25/2018] [Indexed: 01/28/2023]
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Rodríguez-Rodríguez IA, Fernandez-Quiroga KA, Morales-San Claudio PD, Balderas-Rentería I, González-Santiago O. No association between G1359A CB1 polymorphisms and pain in young northeastern Mexicans. Pharmacogenomics 2018; 19:1251-1258. [PMID: 30371142 DOI: 10.2217/pgs-2018-0125] [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: 11/21/2022] Open
Abstract
AIM Recent studies show an association between the endocannabinoid system and pain. In this study, we analyzed the association between two CNR1 gene polymorphisms and pain perception in a northeast Mexican population. METHODS Genotypic and allelic frequencies were obtained for both polymorphisms. Pain threshold, tolerance and perception were measured using the cold pressor task. RESULTS No significant association between the polymorphisms and pain perception was found (p > 0.05). CONCLUSION Genotypic and allelic frequencies for both polymorphisms were reported for the first time in a Mexican population; however, our results suggest that there is not a significant association between these and pain.
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Affiliation(s)
- Ismael A Rodríguez-Rodríguez
- Facultad de Ciencias Químicas, Universidad Autonoma de Nuevo Leon, Pedro de Alba S/N, Ciudad Universitaria, San Nicolás de los Garza, Nuevo Leon, CP 66455, Mexico
| | - Karla A Fernandez-Quiroga
- Facultad de Ciencias Químicas, Universidad Autonoma de Nuevo Leon, Pedro de Alba S/N, Ciudad Universitaria, San Nicolás de los Garza, Nuevo Leon, CP 66455, Mexico
| | - Pilar Dc Morales-San Claudio
- Facultad de Ciencias Químicas, Universidad Autonoma de Nuevo Leon, Pedro de Alba S/N, Ciudad Universitaria, San Nicolás de los Garza, Nuevo Leon, CP 66455, Mexico
| | - Isaías Balderas-Rentería
- Facultad de Ciencias Químicas, Universidad Autonoma de Nuevo Leon, Pedro de Alba S/N, Ciudad Universitaria, San Nicolás de los Garza, Nuevo Leon, CP 66455, Mexico
| | - Omar González-Santiago
- Facultad de Ciencias Químicas, Universidad Autonoma de Nuevo Leon, Pedro de Alba S/N, Ciudad Universitaria, San Nicolás de los Garza, Nuevo Leon, CP 66455, Mexico
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Patel JN, Wiebe LA, Dunnenberger HM, McLeod HL. Value of Supportive Care Pharmacogenomics in Oncology Practice. Oncologist 2018; 23:956-964. [PMID: 29622698 PMCID: PMC6156181 DOI: 10.1634/theoncologist.2017-0599] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Accepted: 02/21/2018] [Indexed: 12/14/2022] Open
Abstract
Genomic medicine provides opportunities to personalize cancer therapy for an individual patient. Although novel targeted therapies prolong survival, most patients with cancer continue to suffer from burdensome symptoms including pain, depression, neuropathy, nausea and vomiting, and infections, which significantly impair quality of life. Suboptimal management of these symptoms can negatively affect response to cancer treatment and overall prognosis. The effect of genetic variation on drug response-otherwise known as pharmacogenomics-is well documented and directly influences an individual patient's response to antiemetics, opioids, neuromodulators, antidepressants, antifungals, and more. The growing body of pharmacogenomic data can now guide clinicians to select the safest and most effective supportive medications for an individual patient with cancer from the very first prescription. This review outlines a theoretical patient case and the implications of using pharmacogenetic test results to personalize supportive care throughout the cancer care continuum. IMPLICATIONS FOR PRACTICE Integration of palliative medicine into the cancer care continuum has resulted in increased quality of life and survival for patients with many cancer types. However, suboptimal management of symptoms such as pain, neuropathy, depression, and nausea and vomiting continues to place a heavy burden on patients with cancer. As demonstrated in this theoretical case, pharmacogenomics can have a major effect on clinical response to medications used to treat these conditions. Recognizing the value of supportive care pharmacogenomics in oncology and application into routine practice offers an objective choice for the safest and most effective treatment compared with the traditional trial and error method.
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Affiliation(s)
- Jai N Patel
- Levine Cancer Institute, Carolinas HealthCare System, Charlotte, North Carolina, USA
| | - Lauren A Wiebe
- NorthShore University Health System, Evanston, Illinois, USA
| | | | - Howard L McLeod
- The DeBartolo Family Personalized Medicine Institute, Moffitt Cancer Center, Tampa, Florida, USA
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19
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Jones S. In this issue of Pharmacogenomics. Pharmacogenomics 2018; 18:1117. [PMID: 28782463 DOI: 10.2217/pgs-2017-0119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Affiliation(s)
- Sarah Jones
- Future Medicine Ltd, Unitec House, London, N3 1QB, UK
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20
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Lawlor PG, Lawlor NA, Reis-Pina P. The Edmonton Classification System for Cancer Pain: a tool with potential for an evolving role in cancer pain assessment and management. ACTA ACUST UNITED AC 2018. [DOI: 10.1080/23809000.2018.1467211] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Peter G Lawlor
- Bruyère Research Institute, Bruyère Continuing Care, Ottawa Hospital Research Institute, The Ottawa Hospital, Ottawa, Canada
| | - Niamh A Lawlor
- Ottawa Hospital Cancer Program, The Ottawa Hospital (NAL), Ottawa, Canada
| | - Paulo Reis-Pina
- Palliative Care Unit, Casa de Saúde da Idanha, Sintra, Portugal
- Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
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