ABCC1 and breast cancer: The expression of the pyrophosphate channel ankylosis protein homolog (ANKH), the hemichannel protein pannexin 1 (PANX1), multidrug resistance associated protein 1 (ABCC1) and solute carrier family 22 (organic anion transporter) member 6, 8 and 11 (SLC22A6, SLC22A8, SLC22A11) were analyzed in breast cancer cells.