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Kaplan–Meier survival curves of the epidermal growth factor receptor (EGFR)-positive cohort stratified by the presence of matted nodes. The 3-year disease-specific survival (DSS) was 60% for EGFR-positive patients with matted nodes and 96% for EGFR-positive patients with no evidence of matted nodes. [Color figure can be viewed in the online issue, which is available at wileyonlinelibrary.com.]
