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Effect of camptothecin and its correlation to RL compounds in breast cancer cell lines. MDA-MB-231, SKBr3, MCF-7 parental and its sub-lines were exposed to 111 nM camptothecin for 3 days, and cell proliferation was measured by sulforhodamine B assay. Results were shown as the mean ± SEM from three experiments. *Significant difference from MCF-7 parental (p < 0.05)
