One recent study has found that the m6A level in peripheral blood RNA combined with current tumor markers such as carcinoembryonic antigen (CEA) or m6A demethylases ALKBH5 and FTO can improve the diagnostic value of m6A, revealing that the m6A level in peripheral blood RNA can be a potential biomarker for GC diagnosis and follow-up (Ge et al. 2020). Here, CEACAM5 is linked to gastric cancer.