When combined with the clinical characteristics of GC, the top six viral species in the Present virus category, such as HERV-H (P < 0.001), HERV-K (P < 0.001), acutely transforming retrovirus (P < 0.001), human retrovirus (P < 0.001), Escherichia phage (P < 0.01), and HERV-W (P < 0.001) were significantly different in GC patients and adjacent tissues (Fig. 5E). This evidence concerns the gene FUT1 and gastric cancer.