Numerous evidence supports this hypothesis: miR-9 has been described as metastamiR in breast cancer and it resulted markedly upregulated in breast cancer cells compared with normal mammary tissues.16MiR-9 directly targets E-cadherin (CDH1) leading to increase cancer cell motility and invasiveness.17 Even more interestingly, miR-9 was found to be secreted by different human tumor cell lines, packaged into microvesicles and directly delivered to endothelial cells where it is able to promote migration and neovascularization activating JACK–STAT pathway. The gene discussed is CDH1; the disease is cancer.