PCAT6 expression in lung cancer cell lines and its effect in cell growth. (A) qRT-PCR was used to examine the relative expression of PCAT6 in lung cancer cell lines (H292, PC-9, CL1-5, H460, H1650, A549, H446, and H1975), and NHBE cells were used as control. (B) The expression of PCAT6 in CL1-5 and H446 cells transfected with si-NC or si-PCAT6 was measured by qRT-PCR. Growth curves of CL1-5 (C) and H446 (D) cells transfected with si-NC or si-PCAT6. Data are presented as mean ± SD, n = 3 independent experiments. *p < 0.05. ***p < 0.0001.