AURKB and triple-negative breast carcinoma: Both quantitative PCR and Western blot analysis indicated that the relative AURKB mRNA and protein levels were significantly higher in non-triple -negative breast cancer cells (MCF-7, ZR-75-1), triple-negative breast cancer cells (MDA-MB-231 and BT549), and PTX-resistant MDA-MB-231/PTX and BT549/PTX cells than in immortalized normal breast epithelial cells (Fig. 1d, e).