Validation of Microsatellite Instability Detection Using a Comprehensive Plasma-Based Genotyping Panel

cfDNA-based MSI detection using Guardant360 is highly concordant with tissue-based testing, enabling highly accurate detection of MSI status concurrent with comprehensive genomic profiling and expanding access to immunotherapy for patients with advanced cancer for whom current testing practices are inadequate.<i>See related commentary by Wang and Ajani, p. 6887</i>.