A Meta-analysis of Diabetes Mellitus and the Risk of Prostate Cancer
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Discussion
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Implication
Meta-analysis reveals an inverse association between diabetes mellitus and prostate cancer risk, suggesting potential metabolic or hormonal influences on tumorigenesis.
Key Points
- To evaluate the relationship between diabetes mellitus and the risk of developing prostate cancer through a comprehensive meta-analysis of published observational studies.
- Searched MEDLINE and EMBASE databases along with article bibliographies through 2005 to identify relevant epidemiological literature.
- Identified and included 19 observational studies (cohort and case-control designs) published between 1971 and 2005.
- Calculated pooled relative risk (RR) using a random-effects model, assessed publication bias, and performed subgroup analyses by study design, PSA screening era, and confounder adjustment.
- Diabetes mellitus was associated with a reduced overall risk of prostate cancer (pooled RR 0.84, 95% CI 0.76–0.93; P for heterogeneity ≤ 0.01), with cohort studies demonstrating an RR of 0.81 (95% CI 0.71–0.92; P ≤ 0.01) and case-control studies an RR of 0.89 (95% CI 0.72–1.11; P = 0.02).
- The inverse association was more pronounced in studies conducted after the introduction of routine PSA screening (RR 0.73, 95% CI 0.64–0.83; P for heterogeneity = 0.10) compared to pre-PSA screening studies (RR 0.94, 95% CI 0.85–1.03; P for heterogeneity = 0.15).
- Studies that adjusted for three or more potential confounders reported an RR of 0.74 (95% CI 0.65–0.85; P for heterogeneity = 0.06), whereas studies with fewer adjustments reported an RR of 0.93 (95% CI 0.86–1.02; P for heterogeneity = 0.18).
Cite This Study
Kasper et al. (2006) studied this question.