SLC22A1 and breast cancer: In BC models, one study used qPCR to assess OCT1–3 expression in 9 cell lines; 4 luminal human BC (MCF-7, SK-BR-3, ZR-75-1 and BT-474) and 5 basal cancer cell lines (BT-20, MDA-MB-435S, MDA-MB-231, MDA-MB-468 and BT-549).