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The mRNA levels of survivin, ABCG2 and Bcl-2 in A2780/DDP-derived CSCs treated with free DOX, SSBPEI–DOX@siRNAs, SSBPEI–DOX@siRNAs/mPEG–HA or SSBPEI–DOX@siRNAs/iRGD–PEG–HA were detected by qPCR. The results are reported as the mean ± SD (n = 3).
