ABCC1 and breast cancer: Interestingly we observed that most of the breast cancer cell lines tested (BT-474, MCF-7, T-47D, MDA-MB-231 and HCC-1806) showed significant upregulation of ABCC1 (Fig 1C) and ABCC3 (Fig 1D) compared to immortalized cell lines (HBL-100 and MCF-10A).