RAP1B and glioma: To further clarify whether or not tumor suppressive roles of miR-28-5p were dependent on Rap1b expression, 100 nM of siRap1b was co-transfected with 30 nM of miR-28-5p inhibitor in A172, U87MG, U373MG, and SNB19 glioma cell lines to assess glioma cells' proliferation by MTT assay and glioma cell invasion by Matrigel transwell invasion assay.