RT Journal Article T1 Development and validation of a lifestyle-based model for colorectal cancer risk prediction: the LiFeCRC score A1 Aleksandrova, Krasimira A1 Reichmann, Robin A1 Kaaks, Rudolf A1 Jenab, Mazda A1 Bueno-de-Mesquita, H. Bas A1 Dahm, Christina C. A1 Eriksen, Anne Kirstine A1 Tjønneland, Anne A1 Artaud, Fanny A1 Boutron-Ruault, Marie-Christine A1 Severi, Gianluca A1 Hüsing, Anika A1 Trichopoulou, Antonia A1 Karakatsani, Anna A1 Peppa, Eleni A1 Panico, Salvatore A1 Masala, Giovanna A1 Grioni, Sara A1 Sacerdote, Carlotta A1 Tumino, Rosario A1 Elias, Sjoerd G. A1 May, Anne M. A1 Borch, Kristin B. A1 Sandanger, Torkjel M. A1 Skeie, Guri A1 Sanchez-Perez, Maria-Jose A1 Huerta, José María A1 Sala, Núria A1 Gurrea, Aurelio Barricarte A1 Quirós, José Ramón A1 Amiano, Pilar A1 Berntsson, Jonna A1 Drake, Isabel A1 van Guelpen, Bethany A1 Harlid, Sophia A1 Key, Tim A1 Weiderpass, Elisabete A1 Aglago, Elom K. A1 Cross, Amanda J. A1 Tsilidis, Konstantinos K. A1 Riboli, Elio A1 Gunter, Marc J. K1 Colorectal cancer K1 Risk prediction K1 Lifestyle behaviour K1 Risk screening K1 Cancer prevention K1 Neoplasias colorrectales K1 Riesgo K1 Estilo de vida K1 Prevención de Enfermedades AB Background: Nutrition and lifestyle have been long established as risk factors for colorectal cancer (CRC). Modifiable lifestyle behaviours bear potential to minimize long-term CRC risk; however, translation of lifestyle information into individualized CRC risk assessment has not been implemented. Lifestyle-based risk models may aid the identification of high-risk individuals, guide referral to screening and motivate behaviour change. We therefore developed and validated a lifestyle-based CRC risk prediction algorithm in an asymptomatic European population.Methods: The model was based on data from 255,482 participants in the European Prospective Investigation into Cancer and Nutrition (EPIC) study aged 19 to 70 years who were free of cancer at study baseline (1992-2000) and were followed up to 31 September 2010. The model was validated in a sample comprising 74,403 participants selected among five EPIC centres. Over a median follow-up time of 15 years, there were 3645 and 981 colorectal cancer cases in the derivation and validation samples, respectively. Variable selection algorithms in Cox proportional hazard regression and random survival forest (RSF) were used to identify the best predictors among plausible predictor variables. Measures of discrimination and calibration were calculated in derivation and validation samples. To facilitate model communication, a nomogram and a web-based application were developed.Results: The final selection model included age, waist circumference, height, smoking, alcohol consumption, physical activity, vegetables, dairy products, processed meat, and sugar and confectionary. The risk score demonstrated good discrimination overall and in sex-specific models. Harrell's C-index was 0.710 in the derivation cohort and 0.714 in the validation cohort. The model was well calibrated and showed strong agreement between predicted and observed risk. Random survival forest analysis suggested high model robustness. Beyond age, lifestyle data led to improved model performance overall (continuous net reclassification improvement = 0.307 (95% CI 0.264-0.352)), and especially for young individuals below 45 years (continuous net reclassification improvement = 0.364 (95% CI 0.084-0.575)).Conclusions: LiFeCRC score based on age and lifestyle data accurately identifies individuals at risk for incident colorectal cancer in European populations and could contribute to improved prevention through motivating lifestyle change at an individual level. PB BioMed Central, Springer Nature YR 2021 FD 2021-01-04 LK http://hdl.handle.net/10668/3881 UL http://hdl.handle.net/10668/3881 LA en NO Aleksandrova K, Reichmann R, Kaaks R, Jenab M, Bueno-de-Mesquita HB, Dahm CC, et al. Development and validation of a lifestyle-based model for colorectal cancer risk prediction: the LiFeCRC score. BMC Med. 2021 Jan 4;19(1):1 DS RISalud RD May 9, 2025