TGFB1 and laryngotracheoesophageal cleft: Our results showed that QKI-5 overexpression or knockdown not only decreased or increased the luciferase activity of TOP flash receptor, and β-catenin accumulation and its downstream gene expressions (c-myc, cyclin D1, MMP2) in LC cells, but also suppressed or facilitated the invasion and TGF-β1-induced EMT of LC cells.