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Comment & Response
December 15, 2015

Pioglitazone Use and Risk of Bladder Cancer

Author Affiliations
  • 1Department of Urology, University of Pittsburgh, Pittsburgh, Pennsylvania
JAMA. 2015;314(23):2568. doi:10.1001/jama.2015.13909

To the Editor A prospective cohort study1 found no relationship between pioglitazone use and the development of bladder cancer, with a median follow-up of 6.1 years. The results are in contrast to the interim 5-year analysis of the study. The new result was not surprising given that the study design favored the null hypothesis.

First, the study excluded any person developing bladder cancer within 6 months of entry into the cohort. A meta-analysis of clinical trials performed by Takeda found that a significant number of patients get bladder cancer in less than 6 months’ duration of pioglitazone use.

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