SIRT1 and hepatocellular carcinoma: Microvascular invasion (MVI) is a crucial risk factor associated with metastasis and postoperative recurrence of HCC [22,23], and long noncoding RNA associated with MVI in HCC (lncRNA MVIH) acts as a predictor of poor prognosis after hepatectomy [24].We hence explored the impact of miR-4669 overexpression on expression levels of SIRT1 and lncRNA MVIH.