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Kaplan-Meier estimator plots of overall survival time distribution in relation to EGFR (P=0.301), stromal Cav-1 (P=0.014) and cluster (EGFR and stromal Cav-1) (P=0.001) expression in patients with human epidermal growth factor receptor 2(−) expression. EGFR, epidermal growth factor receptor; Cav-1, caveolin-1; CI, confidence interval; HR, hazard ratio.
