Type 1 diabetes

Systematic review and meta-analysis corrected for history of smoking tobacco identifies type 1 diabetes as a possible risk factor for bladder cancer

Diabetes Res Clin PractPublished Systematic review and meta-analysis

Pooled result · Bladder cancer occurrence (smoking-controlled)Result — go to the resultSummary estimate 4.29 95% CI 2.45–7.47

Authors' conclusion

Thus, type 1 diabetes appears to be a strong risk factor for bladder cancer, and it seems likely that this association was previously obscured by strong negative confounding by smoking.

Study context

Population
Humans; published estimates of the association between T1D and incident bladder cancer9 studies
Comparison
T1D vs no T1D
Outcome
Incident bladder cancer
Methodological detailsmeta-regression to detect and quantify residual confounding by tobacco smoking, synthetic meta-analysis of smoking-controlled estimates
  • Meta-regression to detect and quantify residual confounding by tobacco smoking
  • Synthetic meta-analysis of smoking-controlled estimates

Pooled result

Bladder cancer occurrence (smoking-controlled)

Summary estimate

4.29

95% CI 2.45–7.47

As reported in the abstract

Further pooled results

Smoking confounding in included studies

Studies not addressing confounding by smoking history
8 of 9

Original publication

Systematic review and meta-analysis corrected for history of smoking tobacco identifies type 1 diabetes as a possible risk factor for bladder cancer. Diabetes Res Clin Pract. Published 30 October 2025. doi:10.1016/j.diabres.2025.112976

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