CEACAM5 and neoplasm: The levels of AFP, TSGF, CEA, and DKK1 were much higher in the ConD+NDEA group than in the normal control group (p < 0.01); and Diet I and Diet II significantly inhibited the elevation of the serum tumor markers, AFP, TSGF, and DKK1 (p < 0.01, Table 3).