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Testing for Causal Association Between Serum Urate, Gout, and Prostatic Cancer in European Males
Sumanth Chandrupatla1, Nicholas Sumpter2, Riku Takei1
1Division of Clinical Immunology and Rheumatology, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
Summary
Gout, specifically its non-hyperuricemia component, may causally influence prostate cancer risk in European men. Serum urate levels did not show a causal link to prostate cancer in this Mendelian randomization study.
Area of Science:
- Genetics
- Epidemiology
- Urology
Background:
- Gout and elevated serum urate (SU) are linked to inflammation.
- Prostate cancer is a common malignancy in men.
- The causal relationship between gout, SU, and prostate cancer remains unclear.
Purpose of the Study:
- To investigate the potential causal effects of serum urate and gout on prostate cancer risk.
- To explore the role of gout's non-hyperuricemia component in prostate cancer development.
- To examine potential reverse causality from prostate cancer to gout or SU.
Main Methods:
- A two-sample Mendelian randomization (MR) study using genome-wide association (GWAS) data from European men.
- Instrumental variables (IVs) were derived from single nucleotide polymorphisms (SNPs) for gout (including a non-hyperuricemia compartment) and serum urate.
- Standard MR methods (IVW, MR-Egger, weighted median) were employed to assess causal relationships and horizontal pleiotropy.
Main Results:
- The non-hyperuricemia compartment of gout showed a significant causal effect on increasing prostate cancer risk (weighted median p=0.01).
- Serum urate levels did not demonstrate a causal effect on prostate cancer risk (IVW p=0.83; weighted median p=0.97).
- MR-Egger regression indicated no significant horizontal pleiotropy for gout or urate IVs (p > 0.33).
- Genes IL1R1, IL1RN, and SLC30A5 were strongly associated with the non-hyperuricemia gout-prostate cancer link, suggesting an inflammatory pathway.
Conclusions:
- This MR study provides evidence for a causal link between the non-hyperuricemia component of gout and an increased risk of prostate cancer in European men.
- The findings implicate gout-associated inflammation, potentially involving IL1R1 and IL1RN, in prostate cancer pathogenesis.
- No causal effect was observed between serum urate levels and prostate cancer, nor reverse causality from prostate cancer to gout or SU.
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