# Ultra-Fast Intraoperative IDH-Mutation Analysis Enables Rapid Stratification and Therapy Planning in Diffuse Gliomas

## TL;DR

A fast IDH-mutation test during surgery helps doctors quickly classify brain tumors and plan treatment for patients.

## Contribution

The study demonstrates the first ultra-fast intraoperative IDH-mutation analysis using the Idylla platform with 100% accuracy.

## Key findings

- The Idylla IDH-mutation assay showed 100% concordance with NGS for both FFPE and intraoperative tissue samples.
- The Idylla system provides results in about 90 minutes, much faster than NGS which takes 7 to 27 days.
- The rapid results enable timely interdisciplinary discussions and therapy planning for diffuse glioma patients.

## Abstract

Diffuse gliomas are the most common primary brain tumors in adults in the Western world. According to the 2021 World Health Organization (WHO) classification of central nervous system (CNS) tumors, the assessment of isocitrate dehydrogenase (IDH1/2)-mutation status is essential for accurate patient stratification. In this study, we performed a comprehensive evaluation of IDH-mutation status in the intraoperative setting using the Idylla platform. The reference cohort comprised 30 formalin-fixed paraffin-embedded (FFPE) tissue samples with known IDH status, while the exploration cohort included 35 intraoperative snap-frozen and native-tissue specimens. The results were compared with those of a standard next-generation sequencing (NGS) analysis. Our findings demonstrate that the Idylla IDH-mutation assay provides 100% concordance compared with NGS analysis for both FFPE and intraoperative tissue samples. The Idylla system delivers results within approximately 90 min, significantly outperforming NGS, which requires between 7 and 27 days. This rapid turnaround facilitates timely interdisciplinary case discussions and enables timely therapy planning, within the framework of neuro-oncological molecular tumor boards. The ultra-fast intraoperative IDH-mutation analysis using the Idylla platform, in combination with intraoperative histopathological assessment, enables rapid patient stratification and treatment planning in diffuse gliomas.