ERBB2 and gastric cancer: For patients with gastric cancer, putative biomarkers from exosomes obtained from plasma, peritoneal lavage fluid, and gastric juice are CCR6, HER-2/neu, methylated LINE 1, and SOX1 as DNA-based markers as well as miR-21 and miR1225-5p as RNA-based markers (Baran et al., 2010; Tokuhisa et al., 2015; Yamamoto H. et al., 2016).