Presentation on theme: "CIP NCIA Rembrandt – Vasari Project research enabled by caBIG - NCIA Eliot Siegel."— Presentation transcript:
CIP NCIA Rembrandt – Vasari Project research enabled by caBIG - NCIA Eliot Siegel
CIP NCIA Origins Neuroimaging is used as a biomarker in diagnosis and therapeutic response in cerebral neoplasia clinical trials. As yet, no consistent criteria in use (e.g. RTOG). Response criteria (MacDonald 1987) does not fully incorporate feature-rich capabilities of MRI. Relative absence of controlled vocabularies used in neuro oncology. Need for a vetted subjective imaging feature set that can be used by imagers to classify primary cerebral neoplasia. e.g.: BI-RADS for Mammography.
CIP NCIA Concept If consistent methodology can be devised for subjective classification of glioma imaging features MRI could play a more central role in: Tumor classification & behavior. Prognosis Therapeutic response.
CIP NCIA Plan to Create Controlled Vocabulary for Primary Brain Tumors Needs analysis from domain experts. Prepare a “straw-man” imaging feature set for human gliomas based on standard MR imaging. Vet feature set with domain experts. Validate feature set using a large collection of human gliomas Gain endorsement from organizations which could contribute resources to the project (e.g. ASNR).
CIP NCIA Initial Project Goals By mid-2007: Affirmation from domain experts that this project would enhance the field. Review relevant literature in this area. Interest by related organizations in this work. Focus: Identify collaborators (AEF, DR, JS) Identify funding mechanism. Create consortium of imaging collections using NCIA
CIP NCIA Fundamental Assumptions for Cerebral Neoplasia Biologic behavior of human gliomas can vary even within the same histologic subtype. MR imaging features of similar histologic subtypes of human gliomas can vary substantially. Genomics of similar histologic subtypes of gliomas are variable. Are the imaging features a better marker for biologic behavior than histology?
CIP NCIA Classify Imaging Features of Entire Tumor and Resected Specimen Record features of the entire tumor at baseline. Distinguish features that comprise tissue in resected specimen.
CIP NCIA Acronyms REMBRANDT (Repository of Molecular Brain Neoplasia Data) an NCI CCR / NABTC national initiative 2003 key NCI CCR personnel: Howard Fine, J.C.Zenklusen Fresh frozen surgical tissue NCI-central lab analyzed for genetics and proteomics ( > 480 cases 1000 ) VASARI (Visually AcesSAble Rembrandt Images) A post-facto opportunistic assembly of clinical images accompanying Rembrandt cases
CIP NCIA Vasari Design TJUH contributed > 50 tissue cases to Rembrandt for which the genetic analysis are data accessible first target: oligodendrogliomas since survival can be prolonged and may have sub-populations Concentrate first on visual classifiers of MR images. Analyze strength of correlation before attempting more complex quantitative approaches Devise unique classifier set with 30 features and pilot test Build score sheets electronically linked to TJU PACS for expedited data management with 3 expert neuroradiologists
CIP NCIA MRI Feature Development Core subjective feature set adapted from Pope et al. AJNR 2005, modified to 30 features. Feature set vetted by local neuroradiologists and domain experts. Finalize data-form following test assessment by evaluators.
CIP NCIA Feature Set – Controlled Vocabulary 30 features clustered by categories. Lesion Location Morphology of Lesion Substance Morphology of Lesion Margin Alterations in Vicinity of Lesion Extent of Resection Goal is capture imaging features of entire tumor and imaging features of resection specimen.
CIP NCIA Leveraged Opportunity Both projects require: Development of a controlled vocabulary which reliably records all aspects of imaging features. Review of a large clinical image dataset with complete clinical, histologic, treatment and survival data for validation.
CIP NCIA Research plan Objective brain tumor genetics/proteomics image phenome Process ad hoc network-based, geo-distributed workgroup Adam Flanders – Neuroradiologist MR expert (TJU, Philadelphia) Daniel Rubin – Radiologist / ontologist informatician (Stanford CA) Lori Dodd – Biostatician, imaging / genetics expertise (NCI Bethesda) Literature search on glioma genetic expression associated with MR image uncovered a pub with 23 visual features, 3 of which correlated with survival.
CIP NCIA Initial Vasari Plan Three components: Data collection Imaging through NCIA Tissue repository and analysis through Rembrandt. Database linkage Create mechanism to link imaging features on NCIA to genomic data on Rembrandt. Analysis perform comparative analysis image features and genomic expression on patient subset. multi-variate analysis of imaging features relative to gene expression
CIP NCIA Application Schema PACS Filesystem & DBase VASARI Webserver & DBase Software resides as an application layer over conventional PACS software. Application communicates to the PACS client workstation and back office through the API. Application also communicates with research database through a webserver.
User is brought to standard clinical query page. Investigators authorized to participate in VASARI have a new worklist selection displayed in their clinical folder list. Selecting VASARI takes user to the research worklist.
CIP NCIA User accesses custom list of TJUH study patients identified by ID number, GMDI number and dates of the two key studies: pre-operative (baseline) and first post- operative study. User selects exam from list by clicking “Load Study” link.
CIP NCIA The two key exams (baseline & first post-operative exam) are automatically loaded into the PACS review palette for the investigator. The two key exams are also annotated with a red “V” icon to distinguish the exams from others that appear on the timeline.
CIP NCIA VASARI data entry form window automatically loads in foreground along with associated MRI studies. data form is used by each reviewer to enter responses for the 30 MRI features. Each feature is listed on a separate row with a brief description. All responses are made through the use of pull- down menus.
CIP NCIA Study display with evaluation form in the foreground.
CIP NCIA Database Extract Data is stored by a unique entry ID and exam number. Keyed by radiologist identifier and exam number. Thirty MRI features stored f1 - f30. Data can be exported in multiple formats and joined to demographic table to extract GMDI number etc.
CIP NCIA Other Details Application was designed to work on ubiquitous Enterprise PC systems instead of dedicated clinical PACS in order to minimize barriers to participation. Application is hidden from other users. Feature variables are stored as ordinal, categorical or boolean values. Editing of data submission is not permitted. Previously reviewed studies automatically disappear from the VASARI worklist and cannot be re-evaluated.
CIP NCIA Long Term Goal VASARI Accrue clinical MR imagesets from other Rembrandt contributors. Perform large scale evaluation and analysis based on lessons learned in TJUH pilot. Build cooperative library of brain tumor genomic data in Rembrandt linked to key images in NCIA subsets.
CIP NCIA Summary Value added of rich accessible data repositories like NCIA and Rembrandt. Interdisciplinary synergy and varied research perspectives. Model for other collaborations.