The half inhibitory concentration (IC50) of endometrial cancer non-stem cells and ECSCs has been previously calculated and found to be 35.81 μg/mL (95%CI = 32.66–39.23 µg/mL) and 63.68 μg/mL (95%CI = 58.34–69.44 µg/mL), respectively. The concentration curve is shown in Figure S1A. Cells were seeded in a 96-well plate with 2 × 104 cells per well. CBP with the IC50 of the endometrial cancer non-stem cells and ECSCs was added to each cell group. After 48 h, CCK8 was added. The absorbance was measured at 450 nm to calculate cell viability.
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