D'Errico's gastric dataset [30] showed that CBX4 was upregulated in diffuse gastric adenocarcinoma (fold − change = 2.466 and P = 2.45E − 05) and gastric mixed adenocarcinoma (fold − change = 3.314 and P = 2.29E − 06). Here, CBX4 is linked to diffuse gastric adenocarcinoma.