Nimptsch KAleksandrova KPham TTPapadimitriou NJanke JChristakoudi SHeath AOlsen ATjønneland ASchulze MBKatzke VKaaks Rvan Guelpen BHarbs JPalli DMacciotta APasanisi FYohar SMCGuevara MAmiano PGrioni SJakszyn PGFigueiredo JCSamadder NJLi CIMoreno VPotter JDSchoen REUm CYWeiderpass EJenab MGunter MJPischon T2024-06-032024-06-032023-10-13Nimptsch K, Aleksandrova K, Pham TT, Papadimitriou N, Janke J, Christakoudi S, Heath A, Olsen A, Tjønneland A, Schulze MB, Katzke V, Kaaks R, van Guelpen B, Harbs J, Palli D, Macciotta A, Pasanisi F, Yohar SMC, Guevara M, Amiano P, Grioni S, Jakszyn PG, Figueiredo JC, Samadder NJ, Li CI, Moreno V, Potter JD, Schoen RE, Um CY, Weiderpass E, Jenab M, Gunter MJ, Pischon T. (2023). Prospective and Mendelian randomization analyses on the association of circulating fatty acid binding protein 4 (FABP-4) and risk of colorectal cancer.. BMC Med. 21. 1. (pp. 391-).1741-7015https://mro.massey.ac.nz/handle/10179/69714BACKGROUND: Fatty acid binding protein 4 (FABP-4) is a lipid-binding adipokine upregulated in obesity, which may facilitate fatty acid supply for tumor growth and promote insulin resistance and inflammation and may thus play a role in colorectal cancer (CRC) development. We aimed to investigate the association between circulating FABP-4 and CRC and to assess potential causality using a Mendelian randomization (MR) approach. METHODS: The association between pre-diagnostic plasma measurements of FABP-4 and CRC risk was investigated in a nested case-control study in 1324 CRC cases and the same number of matched controls within the European Prospective Investigation into Cancer and Nutrition (EPIC) cohort. A two-sample Mendelian randomization study was conducted based on three genetic variants (1 cis, 2 trans) associated with circulating FABP-4 identified in a published genome-wide association study (discovery n = 20,436) and data from 58,131 CRC cases and 67,347 controls in the Genetics and Epidemiology of Colorectal Cancer Consortium, Colorectal Cancer Transdisciplinary Study, and Colon Cancer Family Registry. RESULTS: In conditional logistic regression models adjusted for potential confounders including body size, the estimated relative risk, RR (95% confidence interval, CI) per one standard deviation, SD (8.9 ng/mL) higher FABP-4 concentration was 1.01 (0.92, 1.12) overall, 0.95 (0.80, 1.13) in men and 1.09 (0.95, 1.25) in women. Genetically determined higher FABP-4 was not associated with colorectal cancer risk (RR per FABP-4 SD was 1.10 (0.95, 1.27) overall, 1.03 (0.84, 1.26) in men and 1.21 (0.98, 1.48) in women). However, in a cis-MR approach, a statistically significant association was observed in women (RR 1.56, 1.09, 2.23) but not overall (RR 1.23, 0.97, 1.57) or in men (0.99, 0.71, 1.37). CONCLUSIONS: Taken together, these analyses provide no support for a causal role of circulating FABP-4 in the development of CRC, although the cis-MR provides some evidence for a positive association in women, which may deserve to be investigated further.(c) The author/shttps://creativecommons.org/licenses/by/4.0/Colorectal cancerFABP-4Mendelian randomizationFemaleHumansMaleCase-Control StudiesColorectal NeoplasmsGenome-Wide Association StudyMendelian Randomization AnalysisPolymorphism, Single NucleotideProspective StudiesRisk FactorsJournal article10.1186/s12916-023-03104-11741-7015CC BYjournal-article391-https://www.ncbi.nlm.nih.gov/pubmed/3783373639110.1186/s12916-023-03104-1