Figure 1.

IL-8 production from three gastric cancer cell lines cocultured with clinical isolates of H. pylori from Japanese and U.S. patients. H. pylori was added to the cultured cells (bacterium-to-cell ratio of 100:1) for 24 h, and IL-8 in the supernatant was assayed by ELISA. The broken line indicates the IL-8 levels from each cancer cell without being cocultured with H. pylori (control). The ends of the bars indicates the 25th and 75th percentiles. The 50th percentile (median) is indicated with a line in the bar, and the 10th and 90th percentiles are indicated with error bars.