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CLINICAL REGISTRIESUse and Emerging Best Practices
Tim FriedeDepartment of Medical StatisticsUniversity Medical Center Göttingen
DZHK (German Center for Cardiovascular Research)
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Background: Definition(s) and classificationPurposes of clinical registriesStatistical issues and methodologiesOperational and logistical issuesConclusions and discussion
OUTLINE
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3Classification by the way the population is defined
Not one, but many definitions in use
Also called patient registries, clinical data registries, diseaseregistries, outcomes registries, …
“… a file of documents containing uniform information aboutindividual persons, collected in a systematic and comprehensiveway, in order to serve a predetermined purpose.” (Brooke, 1974)
“… an organized system for the collection, storage, retrieval,analysis, and dissemination of information on individual personswho have either a particular disease, a condition (e.g., a riskfactor) that predisposes [them] to the occurrence of a healthrelated event, or prior exposure to substances (orcircumstances) known or suspected to cause adverse healtheffects.” (US National Committee on Vital and Health Statistics)
DEFINITION(S) OF CLINICAL REGISTRIES
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“… an organized system that uses observational study methods to collect uniform data (clinical and other) to evaluate specified outcomes for a population defined by a particular disease, condition, or exposure, and that serves one or more predetermined scientific, clinical, or policy purposes. A registry database is a file (or files) derived from the registry.”
Reference: Gliklich & Dreyer eds. (2010) Registries for Evaluating Patient Outcomes: A User’s Guide. (Available online!)
DEFINITION(S) OF CLINICAL REGISTRIES
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DEFINITION(S) OF CLINICAL REGISTRIES
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Product registries
drugs or medical devices
Health services registries
patients who have had a common procedure, clinical encounter, or hospitalization
Disease or condition registries
defined by patients having the same diagnosis
Reference: Gliklich & Dreyer (2010)
CLASSIFICATION BY THE WAY THE POPULATION IS DEFINED
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Search terms: disease registry OR clinical registry
PUBMED SEARCH
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Background: Definition(s) and classificationPurposes of clinical registriesStatistical issues and methodologiesOperational and logistical issuesConclusions and discussion
OUTLINE
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Purposes of clinical registries are manifold including …
Epidemiology
estimating prevalence and / or incidence of a disease
Natural history of a disease
exploring prognostic markers
Collect clinical data in context with a biobank
Recruitment into RCTs
assessing eligibility criteria
…
PURPOSES OF CLINICAL REGISTRIES
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Example: systematic review of randomized placebo-controlled trials in relapsing multiple sclerosis (Steinvorth et al, 2013)
AN ASIDE: RCT ELIGIBILITY CRITERIA BECOMING MORE COMPLEX OVER THE YEARS
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Observational data on treatments
real-life treatment effects (population),
long-term follow-up (endpoint);
safety / pharmaco-epidemiology;
Comprehensive cohort design
registry along side randomized controlled trial
patients not agreeing to randomization recruited into registry
Evidence synthesis
combine data from a small RCT with observational data for confirmatory purposes in rare diseases / orphan indications
PURPOSES OF CLINICAL REGISTRIES
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EXAMPLE: EUROPEAN REGISTER OF MULTIPLE SCLEROSIS (EUREMS)
Associated PartnersCollaborating PartnersScientific Advisory Board
A truly European project
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EXAMPLE: EUREMS
Heterogeneity
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EXAMPLE: EU-CERT-ICD
http://www.eu-cert-icd.eu/
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sources
publications
registries
cohort study
EU-CERT-ICD: SOURCES OF EVIDENCE
meta-analysis
publication-based
individual-patient data (IPD)
combined: publications + IPD
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EU-CERT-ICD REGISTRY
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Alport disease
Rare genetic disease leading ultimately to kidney failure
Data from the European registry suggest ACE inhibition delays kidney failure (Gross et al, 2012a)
EXAMPLE: ALPORT DISEASE
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Double-blind RCT in children
Difficulties in recruitment to be expected
EARLY PRO-TECT Alport Trial (Gross et al, 2012b)
EARLY PRO-TECT ALPORT TRIAL
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Different requirements depending on specific purpose(s) of the clinical registry
For example …
Recruitment into RCTs: only basic information on demographics and disease course required
epidemiological registry to estimate prevalence / incidence: capture (nearly) all cases in a certain population
registry to study natural disease course / treatment effects: longitudinal data
registry to contribute to evidence synthesis with randomized controlled trial: registry needs to be sufficiently similar to RCT in terms of population and endpoints captured
REQUIREMENTS ON CLINICAL REGISTRY DEPENDING ON PURPOSE
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Background: Definition(s) and classificationPurposes of clinical registriesStatistical issues and methodologiesOperational and logistical issuesConclusions and discussion
OUTLINE
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Combining registries
Pooling of data sets: Simpson’s paradox
modelling between-registry heterogeneity
in particular when data are not collected under the same protocol, heterogeneity across registries expected
Statistical methods:
stratification by registry / centre
hierarchical models, individual patient data (IPD) meta-analysis (Debray et al (2015) Research Synthesis Meth)
Examples: EU-CERT-ICD
STATISTICAL ISSUES / METHODOLOGIES
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Simpson‘s Paradox
http://en.wikipedia.org/wiki/Simpson%27s_paradox
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Estimating treatment effects in observational data
Problem of confounding in non-randomized treatment comparisons (selection problem)
Statistical methods: propensity scores (matching, stratifying, covariate, ...); …
Example from multiple sclerosis
STATISTICAL ISSUES / METHODOLOGIES
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EXAMPLE: MULTIPLE SCLEROSIS
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EXAMPLE: MULTIPLE SCLEROSISIn an editorial Derfuss and Kappos comment:
“Does this mean that in the “real world” and with longer follow-up, the benefits of interferon beta demonstrated in controlled trials are no longer relevant and that administration of interferon beta should not be prescribed and reimbursed?”
“Lacking evidence of treatment effect is not proof of lacking effect.”
“Furthermore, although methodologically sound, this study cannot avoid the inherent challenges of data analysis and interpretation in nonrandomized observational studies. Sophisticated statistical methods may help adjust for known unequally distributed baseline variables but cannot account for subtle unmeasured selection criteria as sources of bias.”
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Missing data
Missing data can occur for different reasons: e.g. lower standards in data capturing than in RCT; different centres collect data under (slightly) different protocols
Statistical methods: a variety of methods available
Example: Predicting survival in heart failure
STATISTICAL ISSUES / METHODOLOGIES
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EXAMPLE: HEART FAILURE
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EXAMPLE: HEART FAILURESummary table to describe extent of missing data
Methods: “Missing values are handled by multiple imputations using chained equations.”
References: White & Royston (2009); White et al. (2011)
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Calendar time effects
Statistical methods: e.g. smooth (flexible parametric) models, change-point methods
Example: Registries in hip replacement (Friede & Henderson (2003) Stat Med)
Evidence synthesis
Statistical methods: hierarchical models; power priors; recent overview provided by Viele et al (2014) Pharm Stat
Modelling of heterogeneity important, but estimation of challenging with only few studies (a situation frequently encountered)
Example from Alport disease (rare disease)
STATISTICAL ISSUES / METHODOLOGIES
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ESTIMATION OF BETWEEN-TRIAL HETEROGENEITY
Friede et al. (2015)
Coverage probability for confidence intervals of combined effect
Construction of confidence intervals using normal quantiles
Estimators: DerSimonian-Laird (DL), restricted maximum likelihood (REML), Mandel-Paule (MP), Bayes-modal (BM)
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ESTIMATION OF BETWEEN-TRIAL HETEROGENEITY
Friede et al. (2015)
Coverage probability for confidence intervals of combined effect
Construction of confidence intervals using Knapp-Hartung method (using t-quantiles and scaling of standard error)
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ESTIMATION OF BETWEEN-TRIAL HETEROGENEITY
Friede et al. (2015)
Coverage probability for credibility intervals of combined effect
Bayes with “weakly informative” priors for tau
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Comprehensive cohort design
Statistical methods: see Schmoor et al (1996)
Comparisons between randomized and non-randomized patients: (a) baseline characteristics, (b) outcome (e.g. survival), and (c) treatment effect
Example: DZHK VAD study in patients awaiting HTx
STATISTICAL ISSUES / METHODOLOGIES
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Background: Definition(s) and classificationPurposes of clinical registriesStatistical issues and methodologiesOperational and logistical issuesConclusions and discussion
OUTLINE
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Data structure
minimal data set, modular system
Ethical / legal aspects
multi-national registries
Ownership / organization
Academic institutions
Clinical community
Patient organisations
Companies (pharma / CRO) ...
OPERATIONAL / LOGISTICAL ISSUES
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Use of and access to data
Sustainability
Funding
Content development
Technical requirements
Linking registries with other sources
Biobanks
Imaging repositories
Patient reported outcomes (entered directly by patients)
OPERATIONAL / LOGISTICAL ISSUES
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Background: Definition(s) and classificationPurposes of clinical registriesStatistical issues and methodologiesOperational and logistical issuesConclusions and discussion
OUTLINE
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US Agency for Healthcare Research and Quality (AHQR) publication (available online): Registries for Evaluating Patient Outcomes: A User’s Guide
cross-border PAtient REgistries iNiTiative (PARENT)
RESOURCES – A FEW POINTERS
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Clinical registries useful tool to supplement our tool box in clinical research
Requirements on a registry depend on its purpose
Use of clinical registries in confirmatory sense depending on setting (e.g. rare disease, devices, …)
Sustainability appears to be a big hurdle in many settings
CONCLUSIONS AND DISCUSSION
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"Innovative methodology for small populations research" (InSPiRe) received funding from the EU's 7th Framework Programme for research, technological development and demonstration under grant agreement n° FP HEALTH 2013 –602144
EU-CERT-ICD is funded by the European Commission within the 7th Framework Programme under Grant Agreement n° 602299
EUReMS received co-funding from the EU in the framework of the Second Health Programme 2008–2013, Priority Area: 3.3.2, Action 3.3.2.7
EARLY PRO-TECT ALPORT TRIAL received funding from the BMBF (German Ministry of Education and Research)
ACKNOWLEDGEMENTS