YTHDF1 has been reported to be upregulated in multiple cancer types, thereby promoting cancer growth.[26, 27, 28] Copy number amplification of YTHDF1 genes was identified as a genetic cause underlying the increased expression of YTHDF1 in tumor tissues, as demonstrated in both our in‐house GC and the TCGA GC cohorts. The gene discussed is YTHDF1; the disease is gastric cancer.