RT Journal Article T1 Body Size at Different Ages and Risk of 6 Cancers: A Mendelian Randomization and Prospective Cohort Study. A1 Mariosa, Daniela A1 Smith-Byrne, Karl A1 Richardson, Tom G A1 Ferrari, Pietro A1 Gunter, Marc J A1 Papadimitriou, Nikos A1 Murphy, Neil A1 Christakoudi, Sofia A1 Tsilidis, Konstantinos K A1 Riboli, Elio A1 Muller, David A1 Purdue, Mark P A1 Chanock, Stephen J A1 Hung, Rayjean J A1 Amos, Christopher I A1 O'Mara, Tracy A A1 Amiano, Pilar A1 Pasanisi, Fabrizio A1 Rodriguez-Barranco, Miguel A1 Krogh, Vittorio A1 Tjønneland, Anne A1 Halkjær, Jytte A1 Perez-Cornago, Aurora A1 Chirlaque, María-Dolores A1 Skeie, Guri A1 Rylander, Charlotta A1 Borch, Kristin Benjaminsen A1 Aune, Dagfinn A1 Heath, Alicia K A1 Ward, Heather A A1 Schulze, Matthias A1 Bonet, Catalina A1 Weiderpass, Elisabete A1 Davey Smith, George A1 Brennan, Paul A1 Johansson, Mattias K1 obesity K1 body mass index procedure K1 cancer K1 renal cancer K1 attenuation K1 cancer risk K1 kidney AB It is unclear if body weight in early life affects cancer risk independently of adult body weight. To investigate this question for 6 obesity-related cancers, we performed univariable and multivariable analyses using 1) Mendelian randomization (MR) analysis and 2) longitudinal analyses in prospective cohorts. Both the MR and longitudinal analyses indicated that larger early life body size was associated with higher risk of endometrial (odds ratioMR = 1.61, 95% confidence interval = 1.23 to 2.11) and kidney (odds ratioMR = 1.40, 95% confidence interval = 1.09 to 1.80) cancer. These associations were attenuated after accounting for adult body size in both the MR and cohort analyses. Early life body mass index (BMI) was not consistently associated with the other investigated cancers. The lack of clear independent risk associations suggests that early life BMI influences endometrial and kidney cancer risk mainly through pathways that are common with adult BMI. PB Oxford University Press YR 2022 FD 2022-03-16 LK http://hdl.handle.net/10668/19809 UL http://hdl.handle.net/10668/19809 LA en NO Mariosa D, Smith-Byrne K, Richardson TG, Ferrari P, Gunter MJ, Papadimitriou N, et al. Body Size at Different Ages and Risk of 6 Cancers: A Mendelian Randomization and Prospective Cohort Study. J Natl Cancer Inst. 2022 Sep 9;114(9):1296-1300. DS RISalud RD Apr 9, 2025