guoqian jiang, md, phd mayo clinic
DESCRIPTION
OpenCEM Wiki: A Semantic-Web-based Repository for Supporting Harmonization of Clinical Study Data Standards and Clinical Element Models. Guoqian Jiang, MD, PhD Mayo Clinic. Acknowledgement. Harold Solbrig , Mayo Clinic Julie Evans, CDISC Tom Oniki , Ph.D., IHC Joey Coyle, M.D., IHC - PowerPoint PPT PresentationTRANSCRIPT
OpenCEM Wiki: A Semantic-Web-based Repository for
Supporting Harmonization of Clinical Study Data Standards and Clinical Element Models
Guoqian Jiang, MD, PhDMayo Clinic
AcknowledgementHarold Solbrig, Mayo ClinicJulie Evans, CDISCTom Oniki, Ph.D., IHCJoey Coyle, M.D., IHCLacey Hart, Mayo ClinicStan Huff, M.D., IHCRebecca Kush, Ph.D., CDISC Christopher Chute, M.D., Dr. PH, Mayo
Clinic
IntroductionHarmonization between clinical study data
standards and clinical element models (CEMs) would maximize the reuse of the CEMs across the context of clinical study and secondary use, and enable system interoperability.
An integrative semantic repository can be very useful for lowering the barriers to the access of data standards and enabling effective harmonization between them.
Semantic Web Technology
Semantic Web technology provides a scalable framework for semantic data integration of heterogeneous resources and enables semantic sharing.
In a previous study, we developed a CDISC SHARE prototype for supporting collaborative harmonization of clinical study data elements leveraging Semantic Web technology.
Semantic Web Technologies
The Resource Description Framework (RDF)– A W3C standard– A directed, labeled graph data model for representing
information in the Web– Encodes data in the form of subject-predicate-object triples
SPARQL– A standard RDF query language.
Semantic Wikis– Wiki + Semantic Web– Collaboration + Knowledge engineering
Objective
To develop and evaluate a semantic repository for supporting harmonization of clinical study data standards and clinical element models (CEMs) using Semantic Web technology.
Materials
We collected the following standards: – the CDISC clinical study data standards:
CDASH standards in CDISC Operational Data Model (ODM) XML format;
SDTM standards in Excel spreadsheet; CDISC Terminologies in ODM XML format.
– the Intermountain Healthcare Clinical Element Models (CEMs) in CEML XML format.
CDISC Standards
• CDASH - Clinical Data Acquisition Standards Harmonization• SDTM - Study Data Tabulation Model
System Architecture
Data Standards and CEMs in RDF store
CDISC Data StandardsIn ODM and Spreadsheet
CEMs in CEML XML
SPARQL Endpoint and Standard Semantic Query Services
Standards Representation and Harmonization in Semantic Wikis
Semantic WikiFrontend Module
Semantic RepositoryModule
RDF TransformationModule
RDF Transformation RDF Transformation
Semantic Query Interface Module
Prototype Implementation1) We used an open XML2RDF transformation
web service to convert those clinical data standards and CEMs in XML into RDF triples.
2) We used an open source RDF store called 4store to integrate the data standards and CEMs in the RDF model.
3) We established a SPARQL endpoint using built-in services from 4store.
4) In the frontend module, we implemented a Semantic MediaWiki platform with a number of semantic extensions.
SPARQL Query Example – Retrieve descriptions for all
codelists in SDTM
SPARQL Query Example – Retrieve all variables from domain DM
SPARQL Query Example – Retrieve all permissible values for the codelist “ETHNIC”
SPARQL Query Example – Retrieve all qualifiers for StandardLabPanel CEM
Summary
We demonstrated how the data elements and the CEM elements are represented in wiki pages through dynamic semantic queries against the RDF store.
The platform has the potentials for enabling collaborative harmonization between clinical study data standards and CEMs.
Future WorkTo solicit the requirements and workflow process
of data standards harmonization from the community.
To incorporate the advance SPARQL rules for rule-based inference and consistency check.
To incorporate the advanced OWL (Web Ontology Language) representation of CEMs.
References
http://informatics.mayo.edu/sharp/opencem/index.php/Main_Page