Personalized medicine in childhood asthma. Dr Mariëlle Pijnenburg, Erasmus MC Sophia, Rotterdam, NL
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1 Thank you for viewing this presentation. We would like to remind you that this material is the property of the author. It is provided to you by the ERS for your personal use only, as submitted by the author by the author
2 Personalized medicine in childhood asthma Dr Mariëlle Pijnenburg, Erasmus MC Sophia, Rotterdam, NL
3 Conflict of interest disclosure Dr Mariëlle Pijnenburg do not have any real or perceived, direct or indirect conflicts of interest that relate to this presentation.
4 Aims After this presentation you are able: To recognize what patients/ caregivers expect from personalized medicine To name the potentials and limitations of systems biology for personalized medicine
5 Outline Personalized medicine from a patient s perspective: Mrs Kim Price Personalized medicine from the paediatrician s perspective Definitions Why our patients need personalized medicine? Systems biology: metabolomics, genetics, exposome Conclusions MCQ
6 Personalized medicine from a patient s perspective What do patients/ parents expect from personalized medicine? want from their health care provider in asthma care? feel the future will look like? How want patients/ parents to be involved in personalized medicine?
7
8 What is personalized medicine? Personalized/ precision medicine: customization of health care tailored to the individual; uses some kind of technology or discovery enabling a level of personalization not previously feasible or practical; NIH: emerging approach for disease treatment and prevention that takes into account individual variability in genes, environment, and lifestyle for each person. Personal medicine: patient centered care, providing care that is respectful of and responsive to individual patient preferences, needs, and values, and ensuring that patient values guide all clinical decisions. Stratified medicine: classify individuals into subpopulations that differ in their susceptibility to a particular disease or their response to a particular treatment
9 Personal medicine: patient centered care Patient and family centered care Dignity and respect Information sharing Participation Collaboration
10 Patient and family centered care: our experience
11 Outline Personalized medicine from a patient s perspective: Mrs Kim Price Personalized medicine from the paediatrician s perspective Definitions Why our patients need personalized medicine? Systems biology: metabolomics, genetics, exposome Conclusions MCQ
12 Asthma asthma Non-atopic vs atopic Eosinophilic, neutrophilic, paucicellular Severe, moderate, mild Difficult to treat, therapy resistant Exacerbation prone Viral wheeze/ multiple trigger wheeze Early transient, persistent, lateonset wheeze Obesity: yes or no Concordant/ discordant disease Responders/ non-responders Side-effects Preschool children school children - adolescents (near) fatal asthma Triggers Co-morbidities..
13 Asthma asthma Non-atopic vs atopic Eosinophilic, neutrophilic, paucicellular Severe, moderate, mild Difficult to treat, therapy resistant Exacerbation prone Viral wheeze/ multiple trigger wheeze Early transient, persistent, lateonset wheeze Obesity: yes or no Concordant/ discordant disease Responders/ non-responders Side-effects Preschool children school children - adolescents (near) fatal asthma Triggers Co-morbidities..
14 Asthma asthma Non-atopic vs atopic Obesity: yes or no Different phenotypes Concordant/ discordant disease Eosinophilic, neutrophilic, paucicellular Responders/ non-responders Severe, moderate, mild Side-effects Difficult to treat, therapy Preschool children school resistant children - adolescents Exacerbation prone (near) fatal asthma Viral wheeze/ multiple trigger Triggers wheeze Co-morbidities Early transient, persistent, lateonset.. wheeze
15 Asthma management
16 FEV 1 % Change with Mt >7.5% Mt Response Asthma asthma Szefler S. JACI Mt alone n=6 (5%) Neither n=69 (55%) Both n=22 (17%) FP alone n=29 (23%) >7.5% FP Response FEV 1 % Change with FP
17 FEV 1 % Change with Mt >7.5% Mt Response Asthma asthma Szefler S. JACI Mt alone n=6 (5%) Neither n=69 (55%) Both n=22 (17%) Treatment response differs FP alone n=29 (23%) >7.5% FP Response FEV 1 % Change with FP
18 Asthma asthma 20-40% of all children with asthma have poor control Asthma is a complex and heterogenous disease We treat on: Symptoms Exacerbations Lung function What is below the iceberg? How to personalize management?
19 Outline Personalized medicine from a patient s perspective: Mrs Kim Price Personalized medicine from the paediatrician s perspective Definitions Why our patients need personalized medicine? Systems biology: genetics, metabolomics, exposomics Conclusions MCQ
20 Bunyavanich et al. JACI 2015.
21 disease
22 Systems biology Bunyavanich et al. JACI 2015.
23 Systems biology- Genetics Prediction of asthma: genes involved in asthma development Monitoring: Risk assessment Treatment: Pharmacogenetics
24 Genetics - prediction of asthma Klaassen et al. PlosOne 2015.
25 Genetics risk assessment Bønnelykke et al. Nature Genetics 2014.
26 Genetics risk assessment Risk assessment: follow patients with AA more frequently; treat them with ICS Bønnelykke et al. Nature Genetics 2014.
27 Genetics pharmacogenetics Adding LABA 1 of 3 treatment options in step 3 conflicting data on safety FDA meta-analysis McMahon et al. Pediatrics 2011.
28 Genetics pharmacogenetics Gly-to-Arg substitution in the β 2 -adrenoreceptor gene (ADRB2) associated with downregulation of β 2 -receptors Odds ratio exacerbations 1.52 (95% CI ) per A allel in children on LABA and ICS Not in children on ICS only or ICS+LTRA or ICS + LABA + LTRA Turner et al. JACI 2016.
29 School absence 62 children homozygous for Arg/arg: Rescue beta-2 ICS + LABA ICS + LTRA Follow up 1 year QOL Lipworth et al. Clin Sci 2013
30 Pharmacogenetics update 2015 Davis et al. Curr Allergy Asthma Rep 2015.
31 Bunyavanich et al. JACI 2015.
32 Biomarkers (metabolomics) Prediction of asthma Monitoring: risk management Treatment: response to treatment Identify new pathways and possible therapeutic targets
33 Biomarkers Serum Urine Sputum BAL Exhaled breath Exhaled breath condensate (EBC)
34 Biomarkers Serum Urine Sputum BAL Exhaled breath Exhaled breath condensate (EBC)
35 Serum biomarkers - eosinophils Increased risk of later asthma Predict risk of exacerbation (Trung 2014) Predict response to Omalizumab (Busse et al. JACI 2013), mepolizumab (Ortega et al. Ann Am Thor Soc 2014) and reslizumab (Corren et al. Chest 2016)
36 Muraro et al. JACI 2016.
37 Muraro et al. JACI 2016.
38 Biomarkers - Exhaled breath and exhaled breath condensate (EBC) Single markers: e.g. ph, FeNO Combination of (known) markers Profiles of (unknown) markers
39 Biomarkers - Volatile organic compounds Exhaled air contains thousands of VOC Reflect respiratory and systemic disease May be detected by different technology
40 Prediction of treatment response with e-nose Prediction steroid response (FEV1 >12% or PC20AMP>2dd): VOC better than FeNO and sputum eosinophils Van der Schee et al, CEA 2013
41 Prediction of exacerbations prospective study, 40 children, follow up 1 year 2-months intervals: FeNO, VOCs, lung function and symptoms 16/40 exacerbation 6 VOCs optimal predictive value for exacerbations (correct classification 96%, sens 100%, spec 93%) FeNO and lung function not predictive Robroeks et al. ERJ 2013.
42 Predicting asthma: combinations 200 children, 2-4 yrs Astma diagnosis at 6 yrs AUC combination VOCs, genetics and API 0.95 PPV 90% NPV 89% Klaassen/ van de Kant. AJRCCM 2014.
43 Exhaled breath condensate Extracted from Am J Respir Crit Care Med 2001;164(5):731-7 TURBO DECCS 09
44 Acidity of EBC: reduced ph in asthmatic children EBC of asthmatics more acid, especially in steroid naive children Significant overlap Acid-base balance disturbed in asthmatic airways? Carraro et al, Allergy 2005
45 Leukotrienes and 8-isoprostane in EBC EBC leukotrienes E 4, B 4 elevated in asthma and similar in ICS treated and ICS naive asthmatics Mondino JACI isoprostane = marker of oxidative stress Elevated in asthma with and without steroids Shahid, Respir Res 2005
46 Biomarkers - EBC Systematic review of 46 papers on EBC in asthma, atopy in children (Thomas et al. Pediatr Pulmonol 2013) lower EBC ph values in asthmatics, even lower if poorly controlled higher levels of aldehydes, reduced glutathione during exacerbations eicosanoids and TH2 cytokines more variable results, often elevated
47 Biomarkers EB and EBC Systematic review on EB (9) and EBC (84) in respiratory diseases ( Van Mastrigt et al. Clin Exp Allergy. 2014) - Metabolomics may have important advantages over detecting single markers - VOC profiles/ biomarkers EBC able to discern asthma form healthy (AUC 0.94) and respond to treatment - Some correlation with asthma control, less with asthma severity - Lack of standardization of collection and analysis methods - Lack of longitudinal studies and external validation
48 EB and EBC
49 Bunyavanich et al. JACI 2015.
50 Exposome Vrijheid. Thorax 2014.
51 Exposome 50% of worldwide mortality attributable to a few environmental factors: air pollution, smoking, diet Vrijheid. Thorax 2014.
52 Exposome Measurements of exposure are not very accurate Measure only 1 exposure Real time individual monitoring needed Human Exposome Project: environment (diet, lifestyle, behavior) genetics and medication HELIX project: pre- and postnatal exposures EXPOsOMICS project: monitoring of individual exposure with sensors, smartphones, georeferencing and satellites HEALS project: individual exposure measured with apps coupled to DNA sequencing, epigenetic DNA modifications, and gene expression
53 Do not forget Most children with asthma are well controlled with step 1-2 treatment, guided by symptoms and/or lung function. Improving inhaler technique and adherence to treatment may improve asthma control in poorly controlled children
54 Precision medicine challenges Handling of large, complex data sets computational challenge Integration of data sets and integrated analysis Translation in format for clinical decision making Cost-benefit implications
55 Barriers for personalized medicine Electronic medical records Greater number of genes identified for each asthma drug response pathway Ability of genomic information to predict drug treatment response in individual patients Better phenotyping and endotyping More targeted treatments
56 Conclusions Patients want personal medicine : patient and family centered care Personalized medicine for children with asthma is a developing field Treatment and monitoring on genomics/ metabolomics/exposomics may benefit selected children with asthma Pharmacogenetics may help in choosing the right medication for the right child, preventing adverse effects Metabolomics in EB and EBC remain promising but still a research tool Exposomics new dimension which has to be developed
57
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