The Oxidative DNA Damage Marker 8-OHdG Indicates No Clear Association to Newly Detected Breast Cancer in Women

The role of 8-hydroxydeoxyguanosine (8-OHdG) as a biomarker in breast cancer remains controversial with conflicting results across studies. This case-control study aimed at comparing serum 8-OHdG levels between breast cancer patients and healthy controls, and examine associations with clinical characteristics. Thus, 71 Iraqi women (47 newly diagnosed, treatment-naïve breast cancer patients and 24 controls) were used from November 2024 to June 2025. Demographic data and lifestyle factors were collected through structured questionnaires. No significant difference was found in median 8-OHdG levels between breast cancer patients and controls. No correlations were observed between 8-OHdG and age, BMI, tumor grade, or hormone receptor status. Our findings suggest that 8-OHdG may not serve as a general screening biomarker for breast cancer, as its levels were comparable across all clinical and pathological parameters examined.