Bisecting GlcNAc levels and MGAT3 expression were significantly reduced in breast cancer cells MDA-MB-231, MCF7, BT-549 and MCF7DOX response to DOX, PTX or cisplatin in dose- and time-dependent manners (Fig. 2A&B, S2A-J), and in MCF7 compared to MCF7DOX and MCF7PTX (Fig. 2C). This evidence concerns the gene MGAT3 and breast cancer.