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A, The cell apoptosis rate increased with the increasing concentration of EPI in the supernatant in the MCF‐7 cell line. The apoptosis rate was steady at the low concentration gradient of EPI and increased obviously until the concentration was 8 μg/mL in the MCF‐7/ADR cell line. B, The Ki‐67 index decreased with the increase in the EPI concentration in the MCF‐7 cell line. The Ki‐67 index showed minimal change in the MCF‐7/ADR cell line
