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Egg intake and bladder cancer risk: A meta-analysis
Danbo Fang1, Fuqing Tan, Chaojun Wang
1Department of Urology, The First Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou, Zhejiang 310003, P.R. China.
Experimental and Therapeutic Medicine
|December 11, 2012
Summary
Egg consumption does not appear to significantly increase bladder cancer risk overall. However, a protective effect was observed in Japanese populations, suggesting regional differences in this association.
Area of Science:
- Epidemiology
- Nutritional Science
- Oncology
Background:
- Egg intake is hypothesized to promote carcinogenesis due to potential increases in circulating cholesterol levels.
- Existing epidemiological data on egg consumption and bladder cancer risk are inconsistent.
Purpose of the Study:
- To conduct a meta-analysis of available data to clarify the association between egg intake and bladder cancer risk.
- To investigate potential regional differences in the egg consumption-bladder cancer association.
Main Methods:
- A systematic literature search was performed on PubMed for studies published between January 1980 and December 2011.
- Included studies comprised 4 cohort and 9 case-control studies investigating egg intake and bladder cancer.
- Fixed- and random-effects models were utilized to calculate summary risk estimates (REs).
Main Results:
- The combined RE for the highest versus lowest egg intake was 0.94 (95% CI, 0.69-1.18), indicating no strong overall association.
- Weak evidence of heterogeneity was observed across studies.
- A significant difference in the association was noted by geographic region, with a 28% reduced risk observed in Japanese individuals.
Conclusions:
- The study found no strong evidence linking egg consumption to an increased incidence of bladder cancer.
- A protective effect of egg intake on bladder cancer risk was identified specifically within the Japanese population.
- Geographic variations may play a role in the relationship between egg consumption and bladder cancer.
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