HoxB9 regulates the transition between epithelial and mesenchymal phenotypes in OSCC cells. A. Cal27 cells were treated with siRNA targeting HoxB9, and the E-cadherin, N-cadherin, vimentin and α-catenin levels were determined. GAPDH was used as an internal standard for protein loading. The values are presented as the means ± SEM. One-way ANOVA with post-Dunnett analysis was performed using GraphPad Prism 5.0. **P < 0.01 versus the control group (n = 3). B. Cal27 cells were treated with siRNA targeting HoxB9, and the representative immunofluorescence levels of E-cadherin, N-cadherin, vimentin and α-catenin were determined (Scale bars = 50 μm).