Figure 4. Identifying the key long noncoding RNA and constructing the ceRNA network in GC. (A–D) Validating the expression and prognostic value of four key lncRNAs using GEPIA and Kaplan–Meier plotter databases. (E) The potential mRNA-miRNA-lncRNA regulatory network related to GC prognosis. The ellipse, round and diamond shape represents lncRNAs, miRNA and mRNA respectively. Red and blue represent the ups and downs expression, respectively.