In human ECA-109 and TE-13 esophageal carcinoma cells, a radiosensitizing effect of FF has previously been linked to a G2/M cell cycle arrest and reduced VEGF expression [51], whereas radioprotection of normal skin fibroblasts (HaCat) by FF was associated with an upregulation of fatty acid binding protein 4 (FABP4), facilitating the FA transport from the surrounding environment [52]. This evidence concerns the gene FABP4 and carcinoma of esophagus.