Abstract
As biomarkers continue to become an integral part of drug development and decision-making, there are increased expectations for reliable and quantitative assays. Protein biomarker assay results are directly influenced by the calibrator material. The selection of calibrator material presents many challenges that impact the relative accuracy and performance of the assay. There is an industry-wide challenge finding reliable and well-characterized calibrator material with good documentation. Several case studies are presented that demonstrate some of the challenges involved in selecting appropriate calibrators along with the resolutions that were ultimately applied. From these experiences, we present here a set of recommendations for selecting and characterizing calibrator material based on the intended purpose of the assay. Finally, we introduce a commutability approach, based on common clinical chemistry practices, which can be used to demonstrate inter-changeability with calibrator materials across multiple lots and technology platforms for all types of protein biomarker assays.
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