ErbB2 copy number variations in plasma from patients with esophageal carcinoma according to VEGF plasma levels. (A) Histogram showing lack of significant correlation between erbB2 CN variations and VEGF plasma levels in all patients with EC (n. 41), as indicated. The numbers in the bars show the EC patients in each sub-group. (B, C). Kaplan-Meier survival curves for all patients with EC according to low and high plasma levels of VEGF (B), and for patients with EC and low plasma levels of VEGF according to erbB2 CN ≤2 (solid blu line) and erbB2 CN >2 (dashed green line). Data are representative of three independent experiments.