Cells with reduced expression of SEMA6D were significantly more resistant to epirubicin both at the lower dose for the MTT assays (p < 0.05) and in the clonogenic survival assays (p < 0.01). We concluded that reduced SEMA6D expression caused relative epirubicin resistance, and therefore that miR-195 mediates chemoresponse, at least in part, through SEMA6D.