ENO2 and gastric cancer: Specifically, in patients with GC and CRC (healthy controls), the median levels of the serum biomarkers were as follows: NSE, 20.952 (15.190) ng/mL; CEA, 3.040 (1.785) ng/mL; CA19-9, 11.580 (9.535) U/mL; and CA242, 6.240 (3.755) U/mL.