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77% vs 2.92%, P = 0.04). HER2 amplification was an independent prognostic factor for worse disease-free survival (DFS) (HR = 2.53, 95% CI 1.21-5.30, P = 0.014). Conclusion The prevalence of HER2 amplification and BRAF V600E mutation in stage I-III CRC patients in Chinese was 6% and 4%, respectively, and HER2 amplification appeared to be associated with a worse DFS. More comprehensive molecular classification and survival analysis are needed to validate our findings. © 2020 Zhang et al.Purpose The development of int