Figure 1: Antioxidant enzymes activity in erythrocytes of patients with breast cancer before (C0), during (C2), and after (C4) AC chemotherapy. Control group (CG) is represented by healthy patients. Values ​​represent mean ± S.E.M. when compared with control group (CG) by ANOVA followed by -Student-Newman-Keuls. when compared with C0 group (before chemotherapy) and when compared with C2 group (second cycle of chemotherapy).