CEACAM5 and gastric cancer: CEA and CA19-9 have been reported to correlate with disease burden.7,24,25 In this study, an increase in tumour size and pathological stage were associated with the number of positive pre-operative tumour markers, as in our previous report.7 Additionally, similar results were found for the post-operative tumour markers, which indicated that both pre- and post-operative tumour markers may be associated with poor prognosis of GC.