EHRs and large scale comparative effectiveness research
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1 EHRs and large scale comparative effectiveness research September 16, 2014 Dana C. Crawford, PhD Associate Professor Epidemiology and Biostatistics Institute for Computational Biology
2 Single Nucleotide Polymorphism (SNP)
3 EHRs and Research Towards Personalized Medicine Use of EHRs for Genomic Discovery Assessing Clinical Utility Towards Comparative Effectiveness Research Ex: Hypothyroidism
4 Genomic Discovery Study Designs Linkage Studies in Families Genetic Association Studies Simple Inheritance Single Gene Rare variants Controls Cases Complex Inheritance Multiple Genes Common Variants
5 Candidate gene/pathway Study Designs Genome-wide association study (GWAS) Lusis et al. Nature Genetics 40: (2008) Illumina Infinium assay
6 Published Genome-Wide Associations through 12/2012 Published GWA at p 5X10-8 for 17 trait categories NHGRI GWA Catalog
7 Beyond GWAS YOU ARE HERE McCarthy et al Nat Rev Genet 9: (2008)
8 Genetic Association Studies Require Large Sample Sizes Manolio et al. Nature Reviews Genetics 7: (2006)
9 But.. Already several existing cohorts Very expensive Collins Nature 429: (2004)
10 Manolio et al Am J Epidemiol 175: (2012)
11 Large Biobanks Linked to EHRs Relatively inexpensive compared with cohorts Some are population-based Some are prospective Store more than DNA Ethical issues Consent Return results?
12 emerge.mc.vanderbilt.edu
13 Assess utility of DNA collections integrated with the EHRs as a resource for genome science Ethics (RROR) Clinical translation: assessment and model Network-wide genomic data ~87K samples Pediatric and adult Racial/ethnic diversity
14 EHRs and Challenges for Uses in Research Variable Data Density Mean (SD) # of clinical visits 81.8 (107.8) Range of # of clinical visits 1 to 1,456 Mean (SD) # of ICD9 codes (230.4) Range of # of ICD9 codes 1 to 3,617 Ex: EAGLE BioVU (n=15,863)
15 EHRs and Challenges for Uses in Research Clinical versus Population-based Ten most common codes among African Americans (>18 years): Hypertension (401.9, 401.1) Diabetes Mellitus (250) End-stage renal disease (585.6) Sequestrectomy (77) Long-term current use of other medications (v58.69) Other malaise/fatigue (780.79) Chest pain (786.5) Heart failure (428) Kidney transplant (v42.0)
16 EHRs and Challenges for Uses in Research Ten most common codes among Hispanics (>18 years): Sequestrectomy (77) Supervision of other normal pregnancy (v22.1) End-stage renal disease (585.6) Hypertension (401.9, 401.1) Outcome of delivery, single liveborn (V27.0) Diabetes Mellitus (250) Unknown; default (000.00) Supervision of normal first pregnancy (V22.0) Long-term current use of other medications (v58.69)
17 EHRs and Genetic Association Studies Challenges EHR is not built for research Billing codes can be unreliable in defining cases and controls Demonstration Project Can the EHR be used to define cases and controls for genetic association studies? Can these EHR-defined cases and controls replicate known genotype-phenotype associations?
18 General algorithm for determining an EHR phenotype Definite Cases (algorithm-defined) Excluded (algorithm-defined) Possible Cases (require manual review) Controls (algorithm-defined) Billing codes, procedure codes, labs, meds, free text Iterative process Strive for PPV>95%
19 Ritchie, Denny, Crawford, et al AJHG 86: (2010)
20 Where previous OR>1.25, 8/14 replicated Where previous OR<1.25, 0/7 replicated Ritchie, Denny, Crawford, et al AJHG 86: (2010)
21 GWAS for PR Interval Pfeufer et al. Nat Genet 42: (2010) Denny et al Circulation 122: (2010)
22 EAGLE BioVU Phenotypes developed in BioVU/eMERGE Atrial fibrillation BMI Cataract Crohn s disease Dementia Diabetic retinopathy Height Hypothyroidism Lipids (HDL-C, LDL-C, TG) Multiple sclerosis Peripheral artery disease PR interval QRS duration QT interval Red blood cell indices Resistant hypertension Rheumatoid arthritis Thyroid stimulating hormone levels Type 2 diabetes White blood cell indices Cancers (EAGLE/PAGE)* Menopause/Menarche (EAGLE/PAGE)** Cardiac structure and function*** *Bush et al Pac Symp Biocomput 2013: **Malinowski et al Pac Symp Biocomput 2014: ***Wells et al Journal of Clinical Bioinformatics (in press)
23 Genetic Discovery in emerge Five biobanks linked to EHRs with GWAS data on ~18K samples Can we collaborate to Use additional clinical data to define new trait? Implement algorithm across all sites? Perform discovery GWAS? Denny, Crawford, et al AJHG 89(4): (2011)
24 Hypothyroidism Symptoms Fatigue Weight gain Risk Factors Female sex Increased age Family history Complications Heart problems, goiter, depression, birth defects Image:
25 Phenotype Algorithm GH Domain experts define phenotype (VU) Create initial EMR-based algorithm (VU) Share algorithm Marsh Mayo Evaluate & refine (VU) NW
26 Case/Control Algorithm
27 emerge GWAS Sample Size, by Study Group Health/Dementia 1,217 2,712 3,043 2,532 4,113 Marshfield/Cataracts Mayo Clinic/PAD Northwestern/T2D Vanderbilt/Normal cardiac conduction Total = 13,617 European Americans
28 emerge Hypothyroidism Case Sample Size, by Study 18% 7% 6% Group Health/Dementia 30% Marshfield/Cataracts Mayo Clinic/PAD Northwestern/T2D 39% Vanderbilt/Normal cardiac conduction Total = 1,317
29 emerge GWAS for Hypothyroidism 1,317 cases 5,053 controls
30 Results Unmatched Analysis SNP Odds ratio 95% CI P-value rs x10-9 rs x10-9 rs x10-9 rs x10-9 1,317 cases; 5,053 controls; adjusted for decade of birth, sex, site (±PC)
31 Green et al. Nature 470: (2011)
32 Personalized medicine
33 Personalized medicine
34 Importance of Validation (10/17/2013)
35
36 Components of Utility & Validity ACCE Model Project ( ) 44 questions Identify knowledge gaps to aid scope of future research Image:
37 EGAPP Initiative 2004-present Develop methodology for evaluating evidence on genomic tests and translation of those tests into recommendations for use in clinical practice Systematic review process
38 Analytic framework
39 Rapid Review for Clinical Validity Q: Does the genotyping of the 5 specific variants, previously associated with hypothyroidism, in adult asymptomatic women of reproductive age lead to improved health outcomes? Variant Gene GWAS Study OR P-value rs FOXE1 Denny, JC; Crawford DC, x10-9 rs PTPN22 Eriksson, N, x10-13 rs SH2B3 Eriksson, N, x10-12 rs VAV3 Eriksson, N, x10-10 rs HLA region Eriksson, N, x10-8
40 Rapid vs. Systematic Review Rapid evidence review Formulate overarching question Formulate key questions Create search query for literature for PubMed Abstract review-2 reviewers Full text review-2 reviewers* Analysis Write-up Time: ~7 mos, working parttime; minimal cost *access to 3 rd reviewer as necessary Systematic evidence review Formulate overarching question Formulate key questions Create search query, identify databases to use Abstract review-2+ reviewers Full text review-2+ reviewers Analysis Write-up Time: ~1-2+ yrs, costly
41 Key Questions for Rapid Review What is the clinical validity of these SNPs? odds ratios/effect sizes positive predictive values
42 Key Questions for Rapid Review What is the clinical validity of these SNPs? odds ratios/effect sizes positive predictive values Does the genetic testing of these SNPs lead to improved health outcomes? increased screening reduction in time between symptom and diagnosis increased treatment (including for subclinical disease) harms associated with testing
43 Search Query for Rapid Review PubMed database, MeSH terms "hypothyroidism/genetics"[mesh Terms] OR ("hypothyroidism"[mesh Terms] OR "thyrotropin"[mesh Terms] OR "hypothyroidism"[tiab] OR "thyrotropin"[tiab] OR "Hashimoto Disease"[Mesh] OR "hashimoto's thyroiditis"[tiab] OR "hashimoto's disease"[tiab] OR "hashimoto's syndrome"[tiab] OR "hashimoto thyroiditis"[tiab] OR "hashimoto disease"[tiab]) AND ("genetics"[mesh Terms] OR "genetic"[tiab] OR "genetics"[tiab] OR "genetic testing"[tiab] OR "gene"[tiab] OR FOXE1[tiab] OR rs [tiab] OR ((ptpn22[tiab] OR rs [tiab]) AND (Arg620Trp[tiab] OR R620W[tiab] OR "1858C>T"[tiab])) OR ((sh2b3[tiab] OR rs [tiab]) AND "784T>C"[tiab]) OR vav3[tiab] OR rs [tiab] OR HLA[tiab] OR rs [tiab]) AND ("Genetic Testing"[Majr] OR "genetics"[mesh Terms] OR "genetics"[subheading]) AND English[lang] AND "female"[mesh Terms] AND "humans"[mesh Terms] NOT ("Congenital Hypothyroidism"[Mesh] OR "infant"[mesh Terms] OR "Neoplasms"[Mesh] OR "children"[tiab])
44
45 Rapid Evidence Review Results 631 abstracts reviewed 346 full-text articles reviewed Reason for removal Count (n) Full text unavailable 25 Study included pediatric samples (age 17), age not adjusted 22 for or pediatric results reported separately Study included males, sex not adjusted for or male results 47 reported separately Study excluded due to small sample size (n<10) 3 Study excluded due to race/ethnicity not adjusted for or 5 results stratified by race/ethnicity Study excluded because sample included individuals with 1 thyroid cancer, results not stratified by cancer status Study excluded because no effect sizes/odds ratios given 3 Study excluded because no positive predictive values/auc 15 given Study excluded because study did not address any of the key 225 questions of the rapid evidence review
46 Summary: Rapid Evidence Review Streamlined the evidence review process
47 Summary: Rapid Evidence Review Streamlined the evidence review process Found inadequate evidence to recommend for or against genetic testing in asymptomatic women of childbearing age for hypothyroidism
48 Summary: Rapid Evidence Review Streamlined the evidence review process Found inadequate evidence to recommend for or against genetic testing in asymptomatic women of childbearing age for hypothyroidism Results consistent with others lack of clinical validity/utility data
49 Components of Utility & Validity ACCE Model Project ( ) 44 questions Identify knowledge gaps to aid scope of future research Image:
50 Comparative Effectiveness Research CER aims to provide evidence towards consequences of treatment options: Effectiveness Benefits Harms
51 Comparative Effectiveness Research CER research is conducted as Systematic reviews of existing datasets Clinical trials Clinical reviews Other research Studies that generate new evidence
52 Personalized Medicine Ex. Hypothyroidism FOXE1 PTPN22 SH2B3 VAV3 HLA region Clinical validity Clinical utility (CER)
53 CER and EHR Opportunities Large and inexpensive Prospective (with regular clinic visits) Can be harmonized* with epidemiologic studies Variable data density May or may not be representative of population Patients lost to follow-up Effort required to define phenotypes Exposure data difficult to extract *Depends on phenotype/trait
54 Personalized Medicine and Role of EHRs for Research
55 Population Architecture Using Genomics and Epidemiology PAGE EAGLE WHI Coordinating Center MEC CALiCo NHGRI
56 NHGRI
57
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