ZFAS1 and colorectal carcinoma: Similarly, RT-PCR and qPCR method confirmed the elevated expression of lncRNA-ZFAS1 and DDX21 between 20 pairs of CRC tissues and matched adjacent-tumor controls (Figure 1D, 1E), suggesting the possibly positive correlation of lncRNA-ZFAS1 with DDX21 in CRC cells and tissues.