The human lung cancer cell line H460, and its MX-selected derivative BCRP-overexpressing cell line, H460/MX20, were used in this study. The KB-C2 cell line was selected by colchicine (Alfa Aesar, Haverhill, MA, USA) (2 μg/mL) with human cervical carcinoma cell line KB-3-1. All the cell lines were maintained in Dulbecco’s Modified Eagle Medium (Corning Inc., New York, NY, USA) containing 10% fetal bovine serum (Gibco Inc., Billings, MT, USA) and 1% penicillin/streptomycin (Gibco Inc.) at 37 °C with 5% CO2.
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