CEACAM5 and gastric cancer: Surprisingly, these urinary biomarker panels showed potential diagnostic value even for stage I GC, with 91.5% sensitivity and 52.5% specificity for males and 100% sensitivity and 51.6% specificity for females, which showed much higher sensitivity than conventional serum tumour marker CEA (10.1%) and CA19-9 (4.6%) in this study.