In addition to the difference in tumor volume, we also found tumor tissues formed by injection of SGC7901/miR-217 cells displayed much weaker staining of EZH2, Ki-67 and CD31 than those formed by negative control (SGC7901/miR-Ctrl) cells as detected by immunohistochemical analysis (Figure 4C). The gene discussed is PECAM1; the disease is neoplasm.