University of Limerick Institutional Repository

Introducing a novel and robust technique for determining lymph node status in colorectal cancer

DSpace Repository

Show simple item record

dc.contributor.author Hogan, John
dc.contributor.author Judge, Conor
dc.contributor.author O'Callaghan, Michael
dc.contributor.author Aziz, Amir
dc.contributor.author O'Connor, Cormac
dc.contributor.author Burke, John
dc.contributor.author Dunne, Colum P.
dc.contributor.author Walsh, Stewart R.
dc.contributor.author Kalady, Matthew
dc.contributor.author Coffey, Calvin J.
dc.date.accessioned 2015-06-30T16:02:22Z
dc.date.available 2015-06-30T16:02:22Z
dc.date.issued 2014
dc.identifier.uri http://hdl.handle.net/10344/4520
dc.description peer-reviewed en_US
dc.description.abstract Objective: This study aims to harness the potential of public gene expression repositories, to develop gene expression profiles that could accurately determine nodal status in colorectal cancer. Background: Currently, techniques that determine lymph node positivity (before resection) have poor sensitivity and specificity. The ability to determine lymph node status, based on preoperative biopsies, would greatly assist in planning treatment in colorectal cancer. This is particularly relevant in polypdetected cancers. Methods: Public gene expression repositories were screened for experiments comparing metastatic and nonmetastatic colorectal cancer. A customized graphic user interface was developed to extract genes dysregulated across most identified studies (ie, consensus profiles). The utility of consensus profiles was tested by determining whether classifiers could be derived that determined nodal positivity or negativity. Consensus profiles-derived classifiers were tested on separate Affymetrix- and Illumina-based experiments, and collated outputs were compiled in summary receiver operator curve characteristic format, with area under the curve (AUC) reflecting accuracy. The association between classification and oncologic outcome was determined using an additional, independent data set. Final validation was conducted using the Ingenuity network-linkage environment. Results: Four consensus profiles were generated from which classifiers were derived that accurately determined node positive and negative status (pooled AUC were 0.79 ± 0.04 and 0.8 ± 0.03 for nodal positivity and negativity, respectively). Overall AUC ranged from 0.73 to 0.86, demonstrating high accuracy across consensus profile type, classification technique, and array platform used. As consensus profile enabled classification of nodal status, survival outcomes could be compared for those predicted node negative or positive. Patterns of disease-free and overall survival were identical to those observed for standard histopathologic nodal status. Genes contained within consensus profiles were strongly linked to the metastatic process and included (among others) FYN,WNT5A, COL8A1, BMP, and SMAD family members. Conclusions: Microarray expression data available in public gene expression repositories can be harnessed to generate consensus profiles. The latter are a source of classifiers that have prognostic and predictive properties. en_US
dc.language.iso eng en_US
dc.publisher Lippincott Williams & Wilkins en_US
dc.relation.ispartofseries Annals of Surgery;260 (1), pp, 94-103
dc.relation.uri http://dx.doi.org/10.1097/SLA.0000000000000289
dc.rights This is the author’s version of a work that was accepted for publication in Annals of Surgery. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Annals of Surgery, 2014 260 (1), pp. 94-103, http://dx.doi.org/10.1097/SLA.0000000000000289 en_US
dc.subject colorectal cancer en_US
dc.subject consensus profiles en_US
dc.subject lymph node en_US
dc.title Introducing a novel and robust technique for determining lymph node status in colorectal cancer en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1097/SLA.0000000000000289
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US


Files in this item

This item appears in the following Collection(s)

Show simple item record

Search ULIR


Browse

My Account

Statistics