Figure 2

Effect of combination therapy on the growth of esophageal squamous cell carcinoma cell lines in vitro . (A , B) Cell proliferation of Eca-109 cells was influenced after γ-irradiation at 4 Gy/min (IR) in the presence or absence of IGF-1r siRNA. (C , D) Cell proliferation of TE-1 cells was influenced after γ-irradiation at 4 Gy/min (IR) in the presence or absence of IGF-1r siRNA. Bars indicate the standard deviation of the mean. Each experiment was performed in triplicate. (The criterion for statistical significance was *, ** and *** as p < 0.05, 0.01 and 0.001, respectively).