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. 2006 Feb 21;94(6):863–869. doi: 10.1038/sj.bjc.6603010

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Copyright © 2006 Cancer Research UK

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The effect of omeprazole and chloroquine on the toxicity of doxorubicin (A and C) and mitoxantrone (B and D) for EMT-6 (A and B) and MCF-7 (C and D) cells as determined by a clonogenic assay. Doxorubicin alone (•), mitoxantrone alone (▪), drug plus chloroquine 100 μM (▴) or omeprazole 100 μM (▾). Mean and s.e.m. are shown for three independent experiments. Chloroquine and omeprazole showed no cytotoxicity when used alone.