(A) An MTT cell proliferation assay was performed at 48 h after transfection with si-NC + inhibitor NC, si-HOXB1 + miR-3175 inhibitor and si-HOXB1 + inhibitor NC in glioma cell lines. (B-C) Flow cytometric analysis of apoptosis in glioma cell lines after transfection with si-NC + inhibitor NC, si-HOXB1 + miR-3175 inhibitor and si-HOXB1 + inhibitor NC. Apoptosis was assessed with Annexin V-FITC/PI. (D-E) Western blot analysis of several apoptosis-related proteins (procaspase-3, p53 and cytochrome c) expression in U87 cells after transfection with si-NC + inhibitor NC, si-HOXB1 + miR-3175 inhibitor and si-HOXB1 + inhibitor NC. All results are representative of three independent experiments, and a statistical analysis is performed (mean ± SD, *P < 0.05, **P < 0.01, and ***P < 0.001).