CASC21 expression is elevated in CRC and high CASC21 expression predicts poor prognosis. (A) Heatmap of abnormally expressed lncRNAs in CRC in TCGA database. Red in the heat map indicates upregulation, green indicates downregulation. The red arrow denotes CASC21. (B) Left panel: expression of CASC21 in CRC generated from RNA sequencing data from TCGA database. Right panel: qRT-PCR analysis of CASC21 expression in 80 pairs of CRC and corresponding adjacent normal tissues. (C) CASC21 expression in CRC cell lines (HT-29, HCT-116, SW-620, HCT-8 and SW-480) and normal colorectal epithelial cell FHC detected by qRT-PCR. (D) Kaplan-Meier survival analysis of CRC patients’ overall survival in cohort 1 based on CASC21 expression (n= 80, P= 0.004). (E) Kaplan-Meier survival analysis of CRC patients’ overall survival in cohort 2 based on CASC21 expression (n= 64, P= 0.004). All data represent mean ± SEM (n = 3-6). *P < 0.05, **P < 0.01 and ***P < 0.001.