Analytical performance validation of a coronary heart disease risk assessment multi-analyte proteomic test

Nolan N, Tee L, Vijayakumar S, Burazor I, Hytopoulos E, Biggs WH, Beggs M, French C, Harrington DS.
Journal   Expert Opin Med Diagn
Species  
Analytes Measured   CTACK , HGF , IL-16 , MCP-3
Matrix Tested   Serum
Year   2012
Volume  
Page Numbers  
Application   Cytokines and Chemokines
Abstract
Background: Coronary heart disease (CHD) remains prevalent despite efforts to improve CHD risk assessment. The authors developed a multi-analyte immunoassay-based CHD risk assessment (CHDRA) algorithm, clinically validated in a multicenter study, to improve CHDRA in intermediate risk individuals.

Objective: Clinical laboratory validation of the CHDRA biomarker assays' analytical performance.

Methods: Multiplexed immunoassay panels developed for the seven CHDRA assays were evaluated with donor sera in a clinical laboratory. Specificity, sensitivity, interfering substances and reproducibility of the CHDRA assays, along with the effects of pre-analytical specimen processing, were evaluated.

Results: Analytical measurements of the CHDRA panel proteins (CTACK, Eotaxin, Fas Ligand, HGF, IL-16, MCP-3 and sFas) exhibited acceptable accuracy (80 – 120%), cross-reactivity (< 1%), interference (< 30% at high concentrations of bilirubin, lipids, hemoglobin and HAMA), sensitivity and reproducibility (< 20% CV across multiple runs, operators and instruments). Recoveries from donor sera subjected to typical clinical laboratory pre-analytical conditions were within 80 – 120%. The pre-analytical variables did not substantively impact the CHDRA scores.

Conclusions: The CHDRA panel analytical validation in a clinical laboratory meets or exceeds the specifications established during the clinical utility studies. Risk score reproducibility across multiple test scenarios suggests the assays are not susceptible to clinical laboratory pre-analytical and analytical variation.

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