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Original Article | Open Access

The power of a healthy lifestyle for cancer prevention: the example of colorectal cancer

Xuechen Chen1,2Jie Ding1Hengjing Li1,2Prudence R. Carr3Michael Hoffmeister1Hermann Brenner1,4,5 ( )
Division of Clinical Epidemiology and Aging Research, German Cancer Research Center (DKFZ), Heidelberg 69120, Germany
Medical Faculty Heidelberg, Heidelberg University, Heidelberg 69120, Germany
School of Public Health and Preventive Medicine, Monash University, Melbourne, VIC 3004, Australia
German Cancer Consortium (DKTK), German Cancer Research Center (DKFZ), Heidelberg 69120, Germany
Division of Preventive Oncology, German Cancer Research Center (DKFZ) and National Center for Tumor Diseases (NCT), Heidelberg 69120, Germany
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Abstract

Objective

We aimed to directly compare the estimated effects of adherence to a healthy lifestyle with those of risk predisposition according to known genetic variants affecting colorectal cancer (CRC) risk, to support effective risk communication for cancer prevention.

Methods

A healthy lifestyle score (HLS) was derived from 5 lifestyle factors: smoking, alcohol consumption, diet, physical activity, and body adiposity. The association of lifestyle and polygenic risk score (PRS) (based on 140 CRC-associated risk loci) with CRC risk was assessed with multiple logistic regression and compared through the genetic risk equivalent (GRE), a novel approach providing an estimate of the effects of adherence to a healthy lifestyle in terms of percentile differences in PRS.

Results

A higher HLS was associated with lower CRC risk (4,844 cases, 3,964 controls). Those adhering to all 5 healthy lifestyle factors had a 62% (95% CI 54%–68%) lower CRC risk than those adhering to ≤ 2 healthy lifestyle factors. The estimated effect of adherence to all 5 compared with ≤ 2 healthy lifestyle factors was as strong as the effect of having a 79 percentile (GRE 79, 95% CI 61–97) lower PRS. The association between a healthy lifestyle and CRC risk was independent of PRS level but was particularly pronounced among those with a family history of CRC in ≥ 1 first-degree relative (P-interaction = 0.0013).

Conclusions

A healthy lifestyle was strongly inversely associated with CRC risk. The large GRE indicated that CRC risk determined by polygenic risk may be offset to a substantial extent by adherence to a healthy lifestyle.

Electronic Supplementary Material

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Cancer Biology & Medicine
Pages 1586-1597
Cite this article:
Chen X, Ding J, Li H, et al. The power of a healthy lifestyle for cancer prevention: the example of colorectal cancer. Cancer Biology & Medicine, 2022, 19(11): 1586-1597. https://doi.org/10.20892/j.issn.2095-3941.2022.0397

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Received: 08 July 2022
Accepted: 25 August 2022
Published: 05 December 2022
©2022 Cancer Biology & Medicine.

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