Clinical Research

Saturated fat intake and prostate cancer aggressiveness: results from the population-based North Carolina-Louisiana Prostate Cancer Project

Abstract

Background:

Epidemiologic and laboratory evidence supports a role for cholesterol in prostate cancer (PC). Dietary saturated fat content impacts serum cholesterol levels. However, epidemiologic associations between saturated fat and PC aggressiveness are inconsistent. We hypothesized that high saturated fat intake would be associated with increased PC aggressiveness, and that statin use would modify this association.

Methods:

Of 1854 PC cases in the North Carolina-Louisiana PC Project, 321 (17%) were classified as high aggressive (Gleason sum 8, PSA>20 ng ml−1, or Gleason sum 7 and clinical stage T3-4) or low/intermediate aggressive (all other cases). Using low/intermediate aggressive cases as the referent group, we examined the association between tertiles of total fat-adjusted saturated fat intake and high aggressive PC using logistic regression, overall and stratified by race and statin use. We examined total fat-adjusted polyunsaturated and monounsaturated fatty acids (PUFA and MUFA, respectively), trans fat and cholesterol intake in secondary analysis.

Results:

High total fat-adjusted saturated fat intake was associated with an elevated odds ratio (OR) for aggressive PC (ORT3vsT1 1.51; 95% CI 1.10–2.06; P-trend=0.009), with an attenuated association in statin users (ORT3vsT1 1.16; 95% CI 0.67–2.01; P-trend=0.661) compared with non-users (ORT3vsT1 1.71; 95% CI 1.16–2.51; P-trend=0.053). High total fat-adjusted cholesterol intake was associated with aggressive PC in European Americans (ORT3vsT1 1.62; 95% CI 1.02–2.58; P-trend=0.056), but not African Americans (ORT3vsT1 0.92; 95% CI 0.60–1.42; P-trend=0.750). High total fat-adjusted PUFA was inversely associated with PC aggressiveness (ORT3vsT1 0.75; 95% CI 0.55–1.03), although this was not significant. No associations were found between total fat-adjusted MUFA or trans fat and PC aggressiveness.

Conclusions:

High total fat-adjusted saturated fat intake was associated with increased PC aggressiveness, with a suggestion of a stronger effect in men not using statins. The association between total fat-adjusted cholesterol intake and PC aggressiveness was most pronounced in European Americans.

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Acknowledgements

We thank the staff, advisory committees and research subjects participating in the PCaP study for their important contributions. This work was supported by the American Institute for Cancer Research (to EHA). The North Carolina-Louisiana Prostate Cancer Project (PCaP) was funded by the Department of Defense contract DAMD 17-03-2-0052.

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Correspondence to E H Allott.

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The authors declare no conflict of interest.

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Supplementary Information accompanies the paper on the Prostate Cancer and Prostatic Diseases website

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Allott, E., Arab, L., Su, L. et al. Saturated fat intake and prostate cancer aggressiveness: results from the population-based North Carolina-Louisiana Prostate Cancer Project. Prostate Cancer Prostatic Dis 20, 48–54 (2017). https://doi.org/10.1038/pcan.2016.39

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