Validating HER2 copy number variation assessment by NGS: A comparative analysis with immunohistochemistry and in situ hybridization
Anti-HER2 drugs are becoming an important therapeutic option for various solid tumors, increasing the need for HER2 status testing. Comprehensive genomic profiling (CGP) panels, including FoundationOne®CDx, are commonly used to assess ERBB2 (encoding for HER2) copy number alterations. We aimed to evaluate the analytical validity of FoundationOne®CDx assay, by comparing ERBB2 copy number data with traditional HER2 status by immunohistochemistry (IHC)/in situ hybridization (ISH) assays in a heterogeneous cohort of solid tumor samples.