Figure 1From: Fractionated irradiation induced radio-resistant esophageal cancer EC109 cells seem to be more sensitive to chemotherapeutic drugsRadiation cell survival curves for EC109 and EC109/R cells. The colony formation assay was described in Materials and methods. Data represent means with standard deviation (SD) from three independent experiments. There was a significant difference in surviving fraction between parent and radio-resistant cells (p < 0.05).Back to article page