Abstract
Background
We examined associations between two forms of testosterone therapy (TT) and risks of seven cancers among men.
Methods
SEER-Medicare combines cancer registry data from the Surveillance, Epidemiology, and End Results programme with Medicare claims. Our population-based case–control study included incident cancer cases diagnosed between 1992–2015: prostate (n = 130,713), lung (n = 105,466), colorectal (n = 56,433), bladder (n = 38,873), non-Hodgkin lymphoma (n = 17,854), melanoma (n = 14,241), and oesophageal (n = 9116). We selected 100,000 controls from a 5% random sample of Medicare beneficiaries and used logistic regression to estimate odds ratios (OR) and 95% confidence intervals (CI).
Results
TT was associated with lower risk of distant-stage prostate cancer (injection/implantation OR = 0.72, 95% CI: 0.60–0.86; topical OR = 0.50, 95% CI: 0.24–1.03). We also observed inverse associations for distant-stage colorectal cancer (injection/implantation OR = 0.75, 95% CI: 0.62–0.90; topical OR = 0.11, 95% CI: 0.05–0.24). Risks of distant-stage colorectal and prostate cancers decreased with time after initiating TT by injection/implantation. By contrast, TT was positively associated with distant-stage melanoma (injection/implantation OR = 1.70, 95% CI: 1.37–2.11). TT was not associated with bladder cancer, oesophageal cancer, lung cancer or non-Hodgkin lymphoma.
Conclusion
TT was inversely associated with distant-stage prostate and colorectal cancers but was positively associated with distant-stage melanoma. These observations may suggest an aetiologic role for TT or the presence of residual confounding.
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Data availability
SEER-Medicare data are not publicly available. Data requests are managed and approved by Information Management Services, Inc.
Code availability
The SEER-Medicare data and statistical code used to generate the results herein are not publicly available. Request for data and statistical code are managed and approved by Information Management Services, Inc.
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Acknowledgements
The authors acknowledge and thank the National Cancer Institute’s Surveillance, Epidemiology, and End Results Program and the Centers for Medicare and Medicaid Services. We also acknowledge and thank the programming team from Information Management Services (IMS). This work was supported by National Cancer Institute’s Intramural Research Program.
Funding
This work was supported by Intramural Research Funds of the Division of Cancer Epidemiology and Genetics (DCEG) of the National Cancer Institute, Department of Health and Human Services, USA.
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Conception and design: ENB, CKZ and MBC. Data analysis and interpretation: all authors. Manuscript writing: all authors. Final approval of manuscript: all authors.
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Butler, E.N., Zhou, C.K., Curry, M. et al. Testosterone therapy and cancer risks among men in the SEER-Medicare linked database. Br J Cancer 128, 48–56 (2023). https://doi.org/10.1038/s41416-022-02019-7
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DOI: https://doi.org/10.1038/s41416-022-02019-7