To further determine the clinical relevance of KDM4B and p-c-Jun in gastric cancer, we examined the expression of KDM4B and the abundance of p-c-Jun in two consecutive sections of paraffin-embedded gastric cancer specimens (total, n = 87; intestinal, n = 18; diffuse-type, n = 28; mix, n = 11; unknown, n = 30) by immunohistochemistry. Here, KDM4B is linked to gastric cancer.