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Disease-free survival (DFS) of patients with ESCC with or without lymph node metastasis, on the basis of GRB2 expression status. A shorter DFS only for the patients with lymph node metastasis was shown in the GRB2 overexpression group than that in the low expression group by Kaplan-Meier survival analysis (P = 0.067). CI, 95% confidence interval; “vs.” means versus.
