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Vitamin A and lung cancer.
Journal of the National Cancer Institute
|June 1, 1979
Summary
Lower vitamin A intake was linked to increased lung cancer risk, especially in heavy smokers. Carrot consumption and milk intake were also associated with reduced risk in this case-control study.
Area of Science:
- Oncology
- Nutritional Epidemiology
- Public Health
Background:
- Lung cancer remains a leading cause of cancer mortality worldwide.
- Dietary factors, including vitamin A, are being investigated for their potential role in cancer prevention.
- Previous studies suggest a possible link between vitamin A and lung cancer risk, but further investigation is warranted.
Purpose of the Study:
- To investigate the association between vitamin A intake and lung cancer risk in a case-control study.
- To explore potential dose-response relationships and effect modification by smoking status.
Main Methods:
- A retrospective case-control study was conducted with 292 lung cancer patients and 801 controls.
- Dietary data, including vitamin A intake, were collected via interviews.
- A computed index of vitamin A intake was used to assess dietary patterns.
Main Results:
- Lung cancer patients exhibited lower vitamin A intake compared to controls.
- A reduced relative risk (RR) of lung cancer was associated with higher vitamin A intake, particularly in heavy smokers.
- A dose-response relationship was observed, with low vitamin A intake increasing lung cancer risk (RR=2.4).
- Lower frequency of milk drinking and higher consumption of carrots were also noted among controls.
Conclusions:
- Findings suggest a protective role for vitamin A against lung cancer, especially in individuals with heavy smoking habits.
- Dietary patterns, including intake of vitamin A-rich foods like carrots and milk, may influence lung cancer risk.
- Results align with animal studies on retinoids and support previous epidemiological evidence.