Overall survival analysis of LINC00968, miR-9-3p and CCNA2 expression in lung adenocarcinoma from The Cancer Genome Atlas database. Survival curves for (A) LINC00968, (B) miR-9-1, (C) miR-9-2, (D) miR-9-3 and (E) CCNA2. Red and green lines indicate high and low levels of expression, respectively. x-axis, overall survival time (year). y-axis, overall survival probability. The number of patients expressing LINC00968 and CCNA2 in the high-expression and low-expression groups is 267. The number of patients expressing miR-9-3p in the high-expression and low-expression groups is 260. CCNA2, cyclin A2; miR, microRNA.