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Body size and risk of colorectal cancer molecular defined subtypes and pathways: mendelian randomization analyses
Nutrition and Metabolism Branch, International Agency for Research on Cancer, Lyon, France.
Public Health Sciences Division, Fred Hutchinson Cancer Center, WA, Seattle, United States.
Public Health Sciences Division, Fred Hutchinson Cancer Center, WA, Seattle, United States.
Department of Epidemiology, Harvard T.H. Chan School of Public Health, MA, Boston, United States; Harvard-MIT Division of Health Sciences and Technology, Harvard Medical School, MA, Boston, United States.
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2024 (English)In: EBioMedicine, E-ISSN 2352-3964, Vol. 101, article id 105010Article in journal (Refereed) Published
Abstract [en]

Background: Obesity has been positively associated with most molecular subtypes of colorectal cancer (CRC); however, the magnitude and the causality of these associations is uncertain.

Methods: We used Mendelian randomization (MR) to examine potential causal relationships between body size traits (body mass index [BMI], waist circumference, and body fat percentage) with risks of Jass classification types and individual subtypes of CRC (microsatellite instability [MSI] status, CpG island methylator phenotype [CIMP] status, BRAF and KRAS mutations). Summary data on tumour markers were obtained from two genetic consortia (CCFR, GECCO).

Findings: A 1-standard deviation (SD:5.1 kg/m2) increment in BMI levels was found to increase risks of Jass type 1MSI-high,CIMP-high,BRAF-mutated,KRAS-wildtype (odds ratio [OR]: 2.14, 95% confidence interval [CI]: 1.46, 3.13; p-value = 9 × 10−5) and Jass type 2non-MSI-high,CIMP-high,BRAF-mutated,KRAS-wildtype CRC (OR: 2.20, 95% CI: 1.26, 3.86; p-value = 0.005). The magnitude of these associations was stronger compared with Jass type 4non-MSI-high,CIMP-low/negative,BRAF-wildtype,KRAS-wildtype CRC (p-differences: 0.03 and 0.04, respectively). A 1-SD (SD:13.4 cm) increment in waist circumference increased risk of Jass type 3non-MSI-high,CIMP-low/negative,BRAF-wildtype,KRAS-mutated (OR 1.73, 95% CI: 1.34, 2.25; p-value = 9 × 10−5) that was stronger compared with Jass type 4 CRC (p-difference: 0.03). A higher body fat percentage (SD:8.5%) increased risk of Jass type 1 CRC (OR: 2.59, 95% CI: 1.49, 4.48; p-value = 0.001), which was greater than Jass type 4 CRC (p-difference: 0.03).

Interpretation: Body size was more strongly linked to the serrated (Jass types 1 and 2) and alternate (Jass type 3) pathways of colorectal carcinogenesis in comparison to the traditional pathway (Jass type 4).

Funding: Cancer Research UK, National Institute for Health Research, Medical Research Council, National Institutes of Health, National Cancer Institute, American Institute for Cancer Research, Brigham and Women's Hospital, Prevent Cancer Foundation, Victorian Cancer Agency, Swedish Research Council, Swedish Cancer Society, Region Västerbotten, Knut and Alice Wallenberg Foundation, Lion's Cancer Research Foundation, Insamlingsstiftelsen, Umeå University. Full funding details are provided in acknowledgements.

Place, publisher, year, edition, pages
Elsevier, 2024. Vol. 101, article id 105010
Keywords [en]
Colorectal cancer, Mendelian randomization, Molecular subtypes, Obesity
National Category
Cancer and Oncology
Identifiers
URN: urn:nbn:se:umu:diva-222809DOI: 10.1016/j.ebiom.2024.105010PubMedID: 38350331Scopus ID: 2-s2.0-85184797654OAI: oai:DiVA.org:umu-222809DiVA, id: diva2:1850826
Funder
Swedish Research Council, VR 2017-00650Swedish Research Council, VR 2017-01737Knut and Alice Wallenberg Foundation, VLL-765961Available from: 2024-04-11 Created: 2024-04-11 Last updated: 2024-04-11Bibliographically approved

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Harlid, Sophiavan Guelpen, Bethany

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