Evaluation of the rapid Idylla IDH1-2 mutation assay in FFPE glioma samples.

Diagn Pathol

Department of Pathology and Laboratory Medicine, Weill Cornell Medicine, 1300 York Avenue Suite C-302, New York, NY, 10065, USA.

Published: May 2024

IDH1 and IDH2 mutational status is a critical biomarker with diagnostic, prognostic, and treatment implications in glioma. Although IDH1 p.R132H-specific immunohistochemistry is available, it is unable to identify other mutations in IDH1/2. Next-generation sequencing can accurately determine IDH1/2 mutational status but suffers from long turnaround time when urgent treatment planning and initiation is medically necessary. The Idylla assay can detect IDH1/2 mutational status from unstained formalin-fixed paraffin-embedded (FFPE) slides in as little as a few hours. In a clinical validation, we demonstrate clinical accuracy of 97% compared to next-generation sequencing. Sensitivity studies demonstrated a limit of detection of 2.5-5% variant allele frequency, even at DNA inputs below the manufacturer's recommended threshold. Overall, the assay is an effective and accurate method for rapid determination of IDH1/2 mutational status.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11128120PMC
http://dx.doi.org/10.1186/s13000-024-01492-3DOI Listing

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