MAP2K7 and gastric cancer: Moreover, to validate whether BTG2-medicated downregulation of C-myc in GC cells depends on Ras/MEK/ERK pathway, we then performed western blot analysis to examine the expression levels of several Ras/MEK/ERK downstream proteins following transfection of miR-27a-3p mimics/inhibitor or BTG2-pcDNA into MGC-803 and GES-1 cells.