Cancer Causes & Control

, Volume 19, Issue 7, pp 703–710 | Cite as

Hormonal profile of diabetic men and the potential link to prostate cancer

  • Jocelyn S. Kasper
  • Yan Liu
  • Michael N. Pollak
  • Nader Rifai
  • Edward Giovannucci
Original Paper

Abstract

Objective

Previous studies suggest men with diabetes may be at reduced risk for prostate cancer as compared to men without diabetes. To investigate potential biological mechanisms, hormonal profiles of diabetic men and non-diabetic controls were compared.

Methods

In the Health Professionals Follow-Up Study, plasma levels of C-peptide, testosterone, sex-hormone binding globulin, insulin-like growth factor-1, and insulin-like growth factor binding protein-3 were determined in 171 diabetic men and 3,001 non-diabetic controls. Multiple linear regression analysis was conducted and least square means were calculated for hormones of interest.

Results

Plasma levels of several hormones either ≤1, 1.1–6, 6.1–14.9, or ≥15 years after diagnosis with diabetes were examined. As time since diabetes diagnosis increased, plasma levels of C-peptide and IGFBP-3 significantly decreased (p for trend: C-peptide =.05, IGFBP-3 =.03). While testosterone and SHBG levels both significantly increased with increasing time since diabetes diagnosis (p for trend: testosterone =.02, SHBG =.002), the ratio of testosterone to SHBG decreased, suggesting a reduction in bioavailable testosterone. Plasma IGF-1 levels were lower in diabetics than non-diabetics, but no significant time trend was noted.

Conclusion

This study of hormonal profiles of diabetic versus non-diabetic men identified changes in diabetic men that may be consistent with reduced prostate cancer risk.

Keywords

Diabetes Prostate cancer Testosterone C-peptide SHBG IGF-1 IGFBP-3 

Notes

Acknowledgments

This study was supported by grant CA55075 from the National Cancer Institute and W81XWH-06-1-0188 from the Department of Defense. The content is solely the responsibility of the authors and does not necessarily represent the official view of NCI or the National Institutes of Health.

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Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  • Jocelyn S. Kasper
    • 1
    • 2
  • Yan Liu
    • 1
  • Michael N. Pollak
    • 3
  • Nader Rifai
    • 4
    • 5
  • Edward Giovannucci
    • 1
    • 2
    • 6
  1. 1.Department of NutritionHarvard School of Public HealthBostonUSA
  2. 2.Department of EpidemiologyHarvard School of Public HealthBostonUSA
  3. 3.Department of Medicine and OncologyMcGill UniversityMontrealCanada
  4. 4.Department of PathologyHarvard Medical SchoolBostonUSA
  5. 5.Department of Laboratory MedicineChildren’s HospitalBostonUSA
  6. 6.Channing Laboratory, Department of MedicineBrigham and Women’s Hospital, Harvard Medical SchoolBostonUSA

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