According to the results of the staining experiments, PCDHGA9 expression could be divided into three categories, positive 44/83 (53.0%) in normal mucosae (Figs. 2d, h) versus 13/83 (15.7%) in tumor tissues (Figs. 2e, i); weak positive 22/83 (26.5%) in paracancerous mucosae versus 29/83 (34.9%) in GC specimens (Figs. 2f, j); and negative 17/83 (20.5%) versus 41/83 (49.4%) in tumor samples (Figs. 2g, k). This evidence concerns the gene PCDHGA9 and neoplasm.