TFPT and esophageal cancer: Of the positive samples from the Huaian region, which has a very high incidence of esophageal cancer, 42% (47/112) had FB1 levels greater than 2.0 mg/kg in comparison to the 10% (4/40) of the Huantai region with a low incidence of esophageal cancers, suggesting the contributory role of FB1 in human esophageal cancers.