Spatial Tumor Variation May Explain HER2 Testing Discrepancies

◇ RESEARCH

A retrospective analysis of 1,343 colorectal cancer cases found that spatial intratumoral heterogeneity in HER2 overexpression contributes to discordance between immunohistochemistry/FISH and next-generation sequencing, with implications for HER2-targeted therapy selection. (Virchows Arch)