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Effect of doxorubicin, cucurbitacin D, and doxorubicin with cucurbitacin D on MCF7 and MCF7/ADR cell viability. MCF7 and MCF7/ADR cells were treated with different concentrations of doxorubicin, cucurbitacin D, cucurbitacin D (0.5, 2 μg/mL), and doxorubicin (1 μM) for 24, 48, and 72 h. Cell viability was then measured using the MTT assay. Each value represents the mean ± SD. All data are p < 0.0001 by Student t-test
