Prognostic value of miR-4448, miR-2392, miR-2467 and miR-4800 expression. Overall survival was evaluated using an online database, Kaplan-Meier plotter. Red lines, high expression of exosomal miRNAs; black lines, low expression. The cut-off values are set at the median for each gene. HR, hazard ratio; miRNA/miR, microRNA.