Analysis of the diagnostic efficiency of serumoxidative stress parameters in patients with breast cancer at various clinical stages

Background: Reactive oxygen species (ROS) are balanced through enzymatic mechanisms and exogenous antioxidants; imbalance results in oxidative stress (OxS). It is known that OxS plays an important role in the occurrence, development, and metastasis of breast cancer. The present study aimed to assess serum total oxidant status (TOS), total antioxidant status (TAS), and oxidant stress index (OSI) in patients at different clinical stages of breast cancer and to evaluate their diagnostic accuracy. Methods: Serum TOS, TAS, and OSI were determined in 91 patients with breast cancer at different stages, 51 patients with benign breast tumors, and 35 healthy adults. Results: Significant differences in serum TOS (F= 104.384, p= 0.000), TAS (F= 18.247, p= 0.000), and OSI (F = 62.598, p = 0.000) were observed among the 3 groups (benign breast tumor patients, breast cancer patients, and healthy women). Of the enrolled breast cancer patients, significant differences were also observed among different tumor stages, with TOS and OSI gradually increasing as the disease progressed, while TAS diminished. Receiver operating characteristic curve analysis revealed that the area under the ROC curve for OSI (AUC(OSI)) was significantly higher than AUC(TAS) (z= 2.344, p= 0.019) in distinguishing breast cancer from control groups (including disease control and the healthy control). The AUCOSI (z = 4.700, p = 0.001) or AUC(TOS) (z = 4.700, p = 0.001) was significantly higher than AUCTAS in distinguishing breast cancer from the healthy control. The AUCOSI (z = 5.907, p = 0.000) or AUCTOS (z = 5.667, p = 0.000) was significantly higher than AUCTAS in distinguishing benign breast tumors from the healthy control. Conclusion: Oxidative stress parameters might serve as important indexes for monitoring breast cancer occurrence and progression. The combined evaluation of TOS, TAS, and OSI could be more beneficial for clinical assessment. (C) 2016 The Canadian Society of Clinical Chemists. Published by Elsevier Inc. All rights reserved.