Increased Red Cell Superoxide Dismutase Activity Is Associated with Cancer Risk: A Hidaka Cohort Study

Area of Science:

• Biochemistry
• Oncology
• Epidemiology

Background:

• Superoxide dismutase (SOD) is a crucial antioxidant enzyme that neutralizes harmful superoxide radicals.
• Red cell SOD (R-SOD) activity's role in cancer development requires further investigation.
• Understanding redox balance is vital for cellular health and disease prevention.

Purpose of the Study:

• To investigate the association between red cell superoxide dismutase (R-SOD) activity and cancer risk.
• To examine potential sex-specific differences in this association within a Japanese cohort.
• To explore the long-term implications of R-SOD activity on cancer incidence.

Main Methods:

• Prospective cohort study of 1,921 Japanese participants (Hidaka cohort study).
• Analysis using Cox proportional hazards models to estimate hazard ratios (HR) for cancer risk.
• Adjustment for multiple potential confounding factors including age, sex, lifestyle, and metabolic parameters.

Main Results:

• A significant association was observed between higher R-SOD activity and increased overall cancer risk (HR, 1.61).
• This association was significant in men (HR, 2.49) but not in women (HR, 1.46).
• The association was more pronounced in men after excluding early-stage cancers (HR, 4.64).

Conclusions:

• Increased R-SOD activity is associated with a significantly higher risk of developing cancer, especially in men.
• This study is the first to demonstrate a sex-specific link between R-SOD activity and cancer risk.
• Further research is needed to elucidate the precise mechanisms underlying SOD's role in cancer pathogenesis.