Fig. 4From: The prognostic value of EGFR overexpression and amplification in Esophageal squamous cell CarcinomaAssociation between EGFR gene variation and survival in ESCC. The gene amplification (a and b) was not significantly associated with DFS or OS (P = 0.240 or 0.211). However, gene amplification (c and d) did represent delayed prognostic information (P = 0.037 and 0.031)Back to article page