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en Evaluation of the Total Oxidant Status to the Antioxidant Capacity Ratio as a Valuable Biomarker in Breast Cancer Patients بیوشیمی Biochemistry مقالات اصلی Original Article <div style="text-align: justify;">Background: The oxidative balance is a state of equilibrium between oxidants and antioxidants disrupted in various disorders, including BC. This study aimed to assess this equilibrium in breast cancer (BC) patients by looking at the oxidant-to-antioxidant ratio. Methods: This case-control study comprised 40 women patients with breast cancer and 30 age-matched healthy individuals. The oxidation-reduction colorimetric technique was used to determine serum levels of total oxidant status (TOS) and total antioxidant capacity (TAC). The oxidant-to-antioxidant balance was estimated using the TOS- to- TAC ratio (TOS/TAC). Results: The mean TOS in healthy individuals was 8.40±2.06 µmol/L, while in BC patients it was 13.31±2.16 µmol/L (P< 0.001). The mean serum level of TAC was 1.43±0.21 mmol/L in healthy individuals and 1.19±0.15 mmol/L in BC patients (P< 0.001). The mean serum TOS/TAC was 6.01±0.32 in the healthy individuals and 11.42±0.41 in the BC patients (P< 0.0001). There were direct correlations between TAC and estrogen receptor (r=0.339, P=0.038). The TOS/TAC level has a sensitivity of 100% and specificity of 83.33%, distinguishing patients with BC from healthy controls (P< 0.001). A significant trend of increasing risk with rising TOS/TAC levels was also seen [OR=3.62, (95 % CI 1.79, 7.35)]. Conclusions: In breast cancer, the serum TOS to TAC ratio can better diagnose oxidative equilibrium than either component alone.</div> Antioxidants, Biomarkers, Breast Cancer, Oxidants, Oxidative stress. 277 283 http://rbmb.net/browse.php?a_code=A-10-1293-1&slc_lang=en&sid=1 Ahmad Ahmadzadeh 100319475328460017948 100319475328460017948 No Firoozgar Clinical Research Development Center (FCRDC), Iran University of Medical Sciences, Tehran, Iran. Mohammad Javad Khodayar 100319475328460017949 100319475328460017949 No Toxicology Research Center, Medical Basic Sciences Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran & Department of Toxicology, Faculty of Pharmacy, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran. Maryam Salehcheh 100319475328460017950 100319475328460017950 No Toxicology Research Center, Medical Basic Sciences Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran & Department of Toxicology, Faculty of Pharmacy, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran. Zahra Nazari Khorasgani 100319475328460017951 100319475328460017951 No Nanotechnology Research Center, Faculty of Pharmacy, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran. Mehrnoush Matin matin.m@ajums.ac.ir 100319475328460017952 100319475328460017952 Yes Toxicology Research Center, Medical Basic Sciences Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran & Department of Toxicology, Faculty of Pharmacy, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.