CEACAM5 and gastric cancer: From 164 gastric cancer patients and 127 normal people, miR-27a was identified to have a markedly higher confidence interval (0.879) than those of carcinoembryonic antigen (CEA) (0.503) and carbohydrate antigen 19-9 (CA19-9) (0.600), indicating that miR-27a can serve as a biomarker for gastric cancer diagnosis (102).