However, with PCDH10, none of the studies about cell-free DNA methylation levels have been measured in blood samples, but in RASSFIA methylation was found in 50 (68.5%) of the serum samples of 73 gastric cancers (Balgkouranidou et al., 2015) and, in another study,16 (34%) of 47 gastric cancers (Wang et al., 2008). The gene discussed is PCDH10; the disease is gastric cancer.