RT Journal Article T1 Heterogeneity of Colorectal Cancer Risk Factors by Anatomical Subsite in 10 European Countries: A Multinational Cohort Study. A1 Murphy, Neil A1 Ward, Heather A A1 Jenab, Mazda A1 Rothwell, Joseph A A1 Boutron-Ruault, Marie-Christine A1 Carbonnel, Franck A1 Kvaskoff, Marina A1 Kaaks, Rudolf A1 Kühn, Tilman A1 Boeing, Heiner A1 Aleksandrova, Krasimira A1 Weiderpass, Elisabete A1 Skeie, Guri A1 Borch, Kristin Benjaminsen A1 Tjønneland, Anne A1 Kyrø, Cecilie A1 Overvad, Kim A1 Dahm, Christina C A1 Jakszyn, Paula A1 Sanchez-Perez, Maria-Jose A1 Gil, Leire A1 Huerta, José M A1 Barricarte, Aurelio A1 Quirós, J Ramón A1 Khaw, Kay-Tee A1 Wareham, Nick A1 Bradbury, Kathryn E A1 Trichopoulou, Antonia A1 La Vecchia, Carlo A1 Karakatsani, Anna A1 Palli, Domenico A1 Grioni, Sara A1 Tumino, Rosario A1 Fasanelli, Francesca A1 Panico, Salvatore A1 Bueno-de-Mesquita, Bas A1 Peeters, Petra H A1 Gylling, Björn A1 Myte, Robin A1 Jirström, Karin A1 Berntsson, Jonna A1 Xue, Xiaonan A1 Riboli, Elio A1 Cross, Amanda J A1 Gunter, Marc J K1 Anatomic Subsite K1 Colorectal Cancer K1 Distal Colon K1 Heterogeneity K1 Proximal Colon K1 Rectum K1 Risk Factors AB Colorectal cancer located at different anatomical subsites may have distinct etiologies and risk factors. Previous studies that have examined this hypothesis have yielded inconsistent results, possibly because most studies have been of insufficient size to identify heterogeneous associations with precision. In the European Prospective Investigation into Cancer and Nutrition study, we used multivariable joint Cox proportional hazards models, which accounted for tumors at different anatomical sites (proximal colon, distal colon, and rectum) as competing risks, to examine the relationships between 14 established/suspected lifestyle, anthropometric, and reproductive/menstrual risk factors with colorectal cancer risk. Heterogeneity across sites was tested using Wald tests. After a median of 14.9 years of follow-up of 521,330 men and women, 6291 colorectal cancer cases occurred. Physical activity was related inversely to proximal colon and distal colon cancer, but not to rectal cancer (P heterogeneity = .03). Height was associated positively with proximal and distal colon cancer only, but not rectal cancer (P heterogeneity = .0001). For men, but not women, heterogeneous relationships were observed for body mass index (P heterogeneity = .008) and waist circumference (P heterogeneity = .03), with weaker positive associations found for rectal cancer, compared with proximal and distal colon cancer. Current smoking was associated with a greater risk of rectal and proximal colon cancer, but not distal colon cancer (P heterogeneity = .05). No heterogeneity by anatomical site was found for alcohol consumption, diabetes, nonsteroidal anti-inflammatory drug use, and reproductive/menstrual factors. The relationships between physical activity, anthropometry, and smoking with colorectal cancer risk differed by subsite, supporting the hypothesis that tumors in different anatomical regions may have distinct etiologies. YR 2018 FD 2018-07-26 LK http://hdl.handle.net/10668/12770 UL http://hdl.handle.net/10668/12770 LA en NO Murphy N, Ward HA, Jenab M, Rothwell JA, Boutron-Ruault MC, Carbonnel F, et al. Heterogeneity of Colorectal Cancer Risk Factors by Anatomical Subsite in 10 European Countries: A Multinational Cohort Study. Clin Gastroenterol Hepatol. 2019 Jun;17(7):1323-1331.e6. DS RISalud RD Apr 8, 2025