FAS and gastric cancer: Overall, serum FAS levels were higher in the gastric cancer patients [95% confidence interval (CI), 30.37–52.46] than in the healthy controls (95% CI, 1.331–2.131) (P<0.0001; Fig. 2), and notably, more gastric cancer patients were found to have higher levels of serum FAS than predicted by the immunohistochemical staining of the tumor tissues.