• Hector R Wong, Thomas P Shanley, Frederick E Barr, Rajit K Basu, Natalie Z Cvijanovich, Geoffrey L Allen, Neal J Thomas, Robert J Freishtat, Nick Anas, Keith Meyer, Paul A Checchia, Michael T Bigham, Derek S Wheeler, Ken Tegtmeyer, Ranjit S Chima, Lesley A Doughty, Sue E Poynter, Jennifer M Kaplan, Erika Stalets, and Brian M Varisco.
• Department of Pediatrics, Cincinnati Children's Hospital Medical Center and Cincinnati Children's Research Foundation, University of Cincinnati College of Medicine, Cincinnati, OH, USA. hector.wong@cchmc.org
• Crit. Care Med.. 2011 Nov 1;39(11):2511-7.

ObjectiveSeptic shock heterogeneity has important implications for clinical trial implementation and patient management. We previously addressed this heterogeneity by identifying three putative subclasses of children with septic shock based exclusively on a 100-gene expression signature. Here we attempted to prospectively validate the existence of these gene expression-based subclasses in a validation cohort.DesignProspective observational study involving microarray-based bioinformatics.SettingMultiple pediatric intensive care units in the United States.PatientsSeparate derivation (n = 98) and validation (n = 82) cohorts of children with septic shock.InterventionsNone other than standard care.Measurements And Main ResultsGene expression mosaics of the 100 class-defining genes were generated for 82 individual patients in the validation cohort. Using computer-based image analysis, patients were classified into one of three subclasses ("A," "B," or "C") based on color and pattern similarity relative to reference mosaics generated from the original derivation cohort. After subclassification, the clinical database was mined for phenotyping. Subclass A patients had higher illness severity relative to subclasses B and C as measured by maximal organ failure, fewer intensive care unit-free days, and a higher Pediatric Risk of Mortality score. Patients in subclass A were characterized by repression of genes corresponding to adaptive immunity and glucocorticoid receptor signaling. Separate subclass assignments were conducted by 21 individual clinicians using visual inspection. The consensus classification of the clinicians had modest agreement with the computer algorithm.ConclusionsWe have validated the existence of subclasses of children with septic shock based on a biologically relevant, 100-gene expression signature. The subclasses have relevant clinical differences.

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