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. 2025 May 2;34(5):722-736.
doi: 10.1158/1055-9965.EPI-24-0970.

Association of Genetic Liability to Allergic Diseases with Overall and Early-Onset Colorectal Cancer Risk: A Mendelian Randomization Study

Affiliations

Association of Genetic Liability to Allergic Diseases with Overall and Early-Onset Colorectal Cancer Risk: A Mendelian Randomization Study

Saleh Alduhayh et al. Cancer Epidemiol Biomarkers Prev. .

Abstract

Background: The tumor immunosurveillance theory supports that allergic conditions could decrease cancer risk. However, observational evidence yielded inconsistent results for the association between allergic diseases and colorectal cancer risk. We used Mendelian randomization (MR) to examine potential causal associations of allergies with the risk of overall and early-onset colorectal cancer.

Methods: Genome-wide association study summary statistical data were used to identify genetic variants associated with allergic diseases (Nvariants = 65) and individual allergic conditions (asthma, hay fever/allergic rhinitis, and eczema). Using two-sample MR, we examined these variants in relation to incident overall (Ncases = 52,775 cases) and early-onset colorectal cancer (Ncases = 6,176). The mediating role of white blood cells was examined using multivariable MR.

Results: In inverse-variance-weighted models, genetic liability to allergic diseases was inversely associated with overall {OR per log (odds) = 0.90 [95% confidence interval (CI), 0.85-0.96]; P < 0.01} and early-onset colorectal cancer [OR = 0.83 (95% CI, 0.73-0.95); P = 0.01]. Similar inverse associations were found for hay fever/allergic rhinitis or eczema, whereas no evidence of association was found between liability to asthma-related phenotypes and colorectal cancer risk. Multivariable MR adjustment for eosinophils weakened the inverse associations for liability to allergic diseases for overall [OR = 0.96 (95% CI, 0.89-1.03); P = 0.26] and early-onset colorectal cancer [OR = 0.86 (95% CI, 0.73-1.01); P = 0.06].

Conclusions: Our study supports a potential causal association between liability to allergic diseases, specifically hay fever/allergic rhinitis or eczema, and colorectal cancer, possibly at least in part mediated via eosinophil counts.

Impact: Our results provide evidence that allergic responses may also have a role in immunosurveillance against colorectal cancer.

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Conflict of interest statement

R.C. Grant reports personal fees from AstraZeneca, Eisai, Incyte, Knight Therapeutics, Guardant Health, and Ipsen outside the submitted work. L. Li reports grants from the NIH during the conduct of the study. R. Pearlman reports grants from Pelotonia, other support from Myriad Genetics, and grants from the NCI during the conduct of the study. S.B. Gruber reports grants from the NIH during the conduct of the study, as well as other support from Brogent International LLC, AbbVie, Invitae, and Halo Dx outside the submitted work. E.A. Platz (elected member of the AACR Board of Directors) reports personal fees from the American Association for Cancer Research outside the submitted work. B. Van Guelpen reports grants from the Swedish Research Council, Swedish Cancer Society, Region Västerbotten, Knut and Alice Wallenberg Foundation, Lions Cancer Research Foundation, and Insamlingsstiftelsen, Umeå University during the conduct of the study, as well as personal fees from AstraZeneca AB outside the submitted work. A.T. Chan reports personal fees from Boehringer Ingelheim and Pfizer and grants from Freenome outside the submitted work. S. Ogino reports grants from the NIH and the American Cancer Society during the conduct of the study. C.M. Ulrich reports grants from the NIH during the conduct of the study; in addition, she has, as a cancer center director, oversight over research funded by several pharmaceutical companies but has not received funding directly herself. The remaining authors declare no conflict of interest. P. Haycock reports grants from Cancer Research UK during the conduct of the study. G. Severi reports grants from Fondation ARC during the conduct of the study. No disclosures were reported by the other authors.

Figures

Figure 1.
Figure 1.
MR estimates for the association of genetic liability to allergic diseases (asthma, hay fever, or eczema) and individual allergic conditions with the risk of developing colorectal cancer. Results from the IVW approach are depicted.

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