Figure 1. Silencing long noncoding RNA OIP5 antisense RNA 1 (OIP5-AS1) suppresses the proliferation of lung cancer and head and neck squamous cell carcinoma cells. The expression level of OIP5-AS1 was determined by reverse-transcription quantitative polymerase chain reaction (left panels). The data for silenced cells (siRNA) are expressed relative to the corresponding values for cells transfected with control siRNAs (Ctr-i). After transfection with siRNAs for 72 h, the viable cell number was determined by trypan blue staining (right panels). A: H1299 cells. Middle panel shows images under phase-contrast microscopy at 72 h; B: A549 cells; C: FaDu cells; and D: CAL27 cells. Significantly different at: *p<0.05 and **p<0.01.