Effects of doxorubicin (DOX) with/without sitagliptin (Sita) pretreatment on cardiac oxidative stress markers. (a) MDA: malondialdehyde, (b) SOD: superoxide dismutase, (c) GSH: reduced glutathione. Data are the mean ± SEM (n = 8). *P < 0.05, **P < 0.01, ***P < 0.001 significantly different as compared to the control. #P < 0.05, ##P < 0.01 significantly different as compared to the DOX group (ANOVA followed by Tukey-Kramer multiple comparison as a post-hoc test)