The cytotoxicity of doxorubicin (MP Biomedicals, Solon, OH), either alone or in
combination with the ALDH inhibitor DEAB, was determined by methylthiazol
tetrazolium (MTT) assays (Sigma-Aldrich).3 (link) The inhibitory concentration 50 (IC50) was calculated using
GraphPad Prism version 6.0 for Mac OS X statistics software (GraphPad Software,
San Diego, CA).