The human BC cell line MCF-7 was obtained from COBIOER (Nanjing, China) and incubated in a paclitaxel for over 6 months, and we gradually increased the paclitaxel concentration[4 (link)]. Thereafter, MCF-7/PR cell line was established. The DMEM medium (Gibco, Waltham, CA, USA) supplemented with 10% fetal bovine serum (FBS; Gibco) containing 100 mg/mL streptomycin (Sigma-Aldrich, St-Louis, MO, USA) and 100 U/mL penicillin (Sigma-Aldrich) was used to incubate cells. Cell incubation was under a humid condition containing 5% CO2 at 37°C.
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