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Association between cannabis use and the risk of bladder cancer: results from the California Men’s Health Study

Affiliations

  • 1 Department of Urology, Kaiser Permanente Los Angeles Medical Center, Los Angeles, CA. Electronic address: [email protected]
  • 2 Department of Research and Evaluation, Kaiser Permanente Southern California, Los Angeles, CA.
  • 3 Division of Research, Kaiser Permanente Northern California, Oakland, CA.
  • 4 Department of Urology, Kaiser Permanente Los Angeles Medical Center, Los Angeles, CA.
  • PMID: 25623697
  • DOI: 10.1016/j.urology.2014.08.060

Association between cannabis use and the risk of bladder cancer: results from the California Men’s Health Study

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Authors

Affiliations

  • 1 Department of Urology, Kaiser Permanente Los Angeles Medical Center, Los Angeles, CA. Electronic address: [email protected]
  • 2 Department of Research and Evaluation, Kaiser Permanente Southern California, Los Angeles, CA.
  • 3 Division of Research, Kaiser Permanente Northern California, Oakland, CA.
  • 4 Department of Urology, Kaiser Permanente Los Angeles Medical Center, Los Angeles, CA.
  • PMID: 25623697
  • DOI: 10.1016/j.urology.2014.08.060

Abstract

Objective: To investigate the association of cannabis use and tobacco smoking on the incidence of bladder cancer within the California Men’s Health Study cohort.

Methods: We evaluated the records of 84,170 participants in a multiethnic cohort of men aged 45-69 years. Information on demographic and lifestyle factors including smoking history and cannabis use was collected using mailed questionnaires between 2002 and 2003. We linked the study data with clinical records including cancer data from electronic health records.

Results: Overall 34,000 (41%) cohort members reported cannabis use, 47,092 (57%) reported tobacco use, 22,500 (27%) reported using both, and 23,467 (29%) used neither. Men were followed over an 11-year period and 279 (0.3%) developed incident bladder tumors. Among cannabis users, 89 (0.3%) developed bladder cancer in comparison to 190 (0.4%) men who did not report cannabis use (P Conclusion: Although a cause and effect relationship has not been established, cannabis use may be inversely associated with bladder cancer risk in this population.

Copyright © 2015 Elsevier Inc. All rights reserved.

Although a cause and effect relationship has not been established, cannabis use may be inversely associated with bladder cancer risk in this population.

Cannabis Linked to Decreased Bladder Cancer Risk

Leah Lawrence

The use of cannabis among men has been linked to a significantly decreased risk for bladder cancer, according to a recent study; however, no cause and effect association has been found.

The use of cannabis among men has been linked to a significantly decreased risk for bladder cancer, according to a recent study; however, no cause and effect association has been found.

The study, presented at the AUA 2013 Annual Meeting, found that men who reported using cannabis had a 45% lower risk for developing bladder cancer compared with men who did not smoke, even after adjusting for age, BMI, and race/ethnicity.

“Bladder cancer is one of the most prevalent genitourinary malignancies with an estimated 72,570 new cases and 15,210 cancer-related deaths per year in the United States, and it is the fourth most common malignancy in men,” Anil Thomas, MD, study author and endourology fellow at Kaiser Permanente Los Angeles Medical Center, said in an e-mail communication. “Importantly, advanced bladder cancer is inherently challenging to treat due to its associated high mortality and lack of effective systemic therapies.”

To date, there are no epidemiologic studies accurately showing what effect cannabis may have on bladder cancer. To explore the relationship further, Dr. Thomas and colleagues evaluated the incidence of bladder cancer among 82,050 men aged 45 years to 69 years enrolled in the California Men’s Health Study. All men had completed questionnaires including information on demographic and lifestyle factors such as smoking history and cannabis usage. Men who did not smoke were used as a reference group.

Results indicated that 41% of participants reported cannabis use; 57%, tobacco use; 27%, both; and 29%, neither. During the 11 years of follow-up, 279 participants (0.3%) developed bladder tumors. A significant difference was found between the number of cannabis users who developed bladder cancer and bladder cancer among men who did not report cannabis use (0.3% vs 0.4%; P

The use of cannabis among men has been linked to a significantly decreased risk for bladder cancer, according to a recent study; however, no cause and effect association has been found.