“…MiR-21 has been confirmed to be overexpressed in many malignancies such as gastric cancer (Chan et al, 2008), pancreatic cancer (Roldo et al, 2006), hepatocellular cancer (Meng et al, 2007), colon cancer (Slaby et al, 2007), breast cancer (Iorio et al, 2005), prostate cancer (Volinia et al, 2006), brain tumor (Chan et al, 2005), cholangiocarcinoma (Meng et al, 2006), lung cancer (Markou et al, 2008), esophageal cancer (Feber et al, 2008), head and neck cancer (Tran et al, 2007), and ovarian cancer (Iorio et al, 2007). In addition, clinical significance of serum miR-21 expression in human cancers has been reported in recent investigations.…”