Incidence of cancer and mortality following alpha-tocopherol and beta-carotene supplementation: a postintervention follow-up
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Summary
This summary is machine-generated.The Finnish Alpha-Tocopherol, Beta-Carotene Cancer Prevention (ATBC) Study found that antioxidant effects of alpha-tocopherol and beta-carotene disappeared after supplementation ended. Smokers should avoid beta-carotene due to increased risks.
Area Of Science
- Nutritional epidemiology
- Cancer prevention research
- Clinical trial analysis
Background
- Alpha-tocopherol supplementation in the ATBC Study reduced prostate cancer incidence.
- Beta-carotene supplementation increased lung cancer risk and total mortality.
- Postintervention follow-up is crucial for understanding long-term antioxidant effects.
Purpose Of The Study
- To evaluate the duration and late effects of alpha-tocopherol and beta-carotene supplementation.
- To analyze postintervention cancer incidence and mortality.
- To assess the long-term impact of antioxidants on male smokers' health.
Main Methods
- Postintervention follow-up of 25,563 men from the ATBC Study.
- Assessment of cancer incidence and cause-specific mortality for 6 years and total mortality for 8 years.
- Utilized Finnish Cancer Registry and Register of Causes of Death, with medical record confirmation.
Main Results
- No significant late preventive effects of alpha-tocopherol or beta-carotene on other cancers were observed.
- Beta-carotene recipients showed a non-significant increase in lung cancer incidence (RR 1.06).
- Alpha-tocopherol recipients showed a non-significant decrease in prostate cancer incidence (RR 0.88).
- Excess risk from beta-carotene was primarily due to cardiovascular diseases and disappeared 4-6 years post-intervention.
Conclusions
- Beneficial and adverse effects of alpha-tocopherol and beta-carotene supplementation diminished after the intervention period.
- The prostate cancer preventive effect of alpha-tocopherol needs further validation in other studies.
- Beta-carotene supplementation is not recommended for smokers due to potential risks.