PGC and adenoma: There was no difference in the serum concentrations of PGA or PGA/PGC ratio between the adenoma (PGA, 74.4±53.5 μg/L and PGA/PGC ratio, 4.5±2.7) and EGC groups (PGA, 78.8±47.1 μg/L and PGA/PGC ratio, 5.4±3.2; p = 0.602 and p = 0.065, respectively).