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Updated: Mar 11, 2026
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Obesity and Kidney Cancer
Kathryn M Wilson1,2, Eunyoung Cho3,4,5
1Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA, USA.
Summary
Obesity is a significant risk factor for developing renal cell cancer (RCC), particularly the clear cell type. While obesity is linked to increased RCC risk, its effect on survival is complex and may involve an "obesity paradox."
Area of Science:
- Oncology
- Epidemiology
- Metabolic Syndrome
Background:
- Renal cell cancer (RCC) incidence is rising globally.
- Obesity is a well-established risk factor for RCC.
- Previous meta-analyses confirm a positive association between obesity and RCC risk.
Purpose of the Study:
- To review the association between obesity and renal cell cancer (RCC) risk and survival.
- To explore potential mechanisms linking obesity to renal carcinogenesis.
- To discuss the complexities of the "obesity paradox" in RCC survival.
Main Methods:
- Systematic review and meta-analysis of cohort and case-control studies.
- Examination of various obesity measures including Body Mass Index (BMI), waist circumference (WC), and waist-to-hip ratio (WHR).
- Review of proposed biological mechanisms and survival data.
Main Results:
- Consistent positive association found between obesity and increased RCC risk, independent of hypertension.
- Association observed across different obesity metrics and stronger in women.
- Positive association primarily linked to clear cell RCC subtype.
- RCC survival association with obesity is complex, with some studies suggesting an "obesity paradox".
Conclusions:
- Obesity is a significant risk factor for developing RCC.
- Potential mechanisms involve insulin resistance, growth factors (IGF-1), hormones, and adiponectin.
- The "obesity paradox" in RCC survival requires further investigation to rule out bias and reverse causation.
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