The methylation of PCDH10 is involved in metastasis and has been found in many carcinomas, including colorectal, nasopharyngeal, esophageal, hepatocellular, breast, cervical, and lung cancers, and also in gastric cancer (Li et al., 2012a; Li et al., 2012b; Deng et al., 2014). The gene discussed is PCDH10; the disease is gastric cancer.