MicroRNA-367 is a potential diagnostic biomarker for patients with esophageal squamous cell carcinoma

In this study, we investigated whether microRNA-367 (miR-367) may serve as a circulating biomarker and tumor oncogene in esophageal squamous carcinoma (ESCC). Circulating serum miR-367 was compared by quantitative RT-PCR (qRT-PCR) between 35 ESCC patients and 35 normal control patients, as well paired ESCC tumor tissues and adjacent non-tumor esophageal epithelial tissues in 46 patients. The correlation between serum miR-367 and clinicopathological properties of ESCC patients was assessed. The overall survival (OS) was assessed by Kaplan–Meier method and compared by log-rank test between patients with high serum miR-367 and low serum miR-367. The possibility of miR-367 being independent prognostic factor for ESCC was also assessed. Furthermore, lentivirus-mediated miR-367 downregulation was conducted in ESCC cell lines Kyse30 and TE-1 cells to assess the possible oncogenic effect of miR-367 on ESCC proliferation and cell cycle transition in vitro. MiR-367 was aberrantly upregulated in sera and tumors of ESCC patients, whereas downregulated in ESCC patients after the treatments of esophagectomy and chemotherapy. Serum miR-367 was found to be closely correlated with the clinicopathological properties of differentiation grades, clinical stage and tumor metastasis in ESCC patients. Serum miR-367 was also confirmed to be associated with OS, as well as serving independent prognostic factor in ESCC patients. Moreover, lentivirus-induced miR-367 downregulation inhibited cancer growth and cell cycle transition in Kyse30 and TE-1 cells. MiR-367 is a potential biomarker for ESCC and may act as an oncogene in regulating ESCC development. •MiR-367 was aberrantly upregulated in sera and tumors of ESCC patients.•MiR-367 was downregulated in ESCC patients after esophagectomy or chemotherapy.•Serum miR-367 was correlated with the clinicopathological properties of ESCC patients.•Serum miR-367 was associated with OS in ESCC patients.•lentivirus-induced miR-367 downregulation inhibited ESCC growth and cell cycle transition.