HCG18 expression was increased in GC tissues than in adjacent normal tissues (Figure 1(a), p < 0.05) and significantly upregulated in human gastric adenocarcinoma cell lines (BSG823, HS-746 T, MKN-28, and 9811) compared with GSE-1 (Figure 1(b), p < 0.05). Here, HCG18 is linked to gastric adenocarcinoma.