RT Journal Article T1 Plasma carotenoids, vitamin C, tocopherols, and retinol and the risk of breast cancer in the European Prospective Investigation into Cancer and Nutrition cohort. A1 Bakker, Marije F A1 Peeters, Petra Hm A1 Klaasen, Veronique M A1 Bueno-de-Mesquita, H Bas A1 Jansen, Eugene Hjm A1 Ros, Martine M A1 Travier, Noémie A1 Olsen, Anja A1 Tjønneland, Anne A1 Overvad, Kim A1 Rinaldi, Sabina A1 Romieu, Isabelle A1 Brennan, Paul A1 Boutron-Ruault, Marie-Christine A1 Perquier, Florence A1 Cadeau, Claire A1 Boeing, Heiner A1 Aleksandrova, Krasimira A1 Kaaks, Rudolf A1 Kühn, Tilman A1 Trichopoulou, Antonia A1 Lagiou, Pagona A1 Trichopoulos, Dimitrios A1 Vineis, Paolo A1 Krogh, Vittorio A1 Panico, Salvatore A1 Masala, Giovanna A1 Tumino, Rosario A1 Weiderpass, Elisabete A1 Skeie, Guri A1 Lund, Eiliv A1 Quirós, J Ramón A1 Ardanaz, Eva A1 Navarro, Carmen A1 Amiano, Pilar A1 Sanchez-Perez, Maria-Jose A1 Buckland, Genevieve A1 Ericson, Ulrika A1 Sonestedt, Emily A1 Johansson, Matthias A1 Sund, Malin A1 Travis, Ruth C A1 Key, Timothy J A1 Khaw, Kay-Tee A1 Wareham, Nick A1 Riboli, Elio A1 van Gils, Carla H K1 EPIC K1 antioxidants K1 breast cancer K1 carotenoids K1 plasma AB Carotenoids and vitamin C are thought to be associated with reduced cancer risk because of their antioxidative capacity. This study evaluated the associations of plasma carotenoid, retinol, tocopherol, and vitamin C concentrations and risk of breast cancer. In a nested case-control study within the European Prospective Investigation into Cancer and Nutrition cohort, 1502 female incident breast cancer cases were included, with an oversampling of premenopausal (n = 582) and estrogen receptor-negative (ER-) cases (n = 462). Controls (n = 1502) were individually matched to cases by using incidence density sampling. Prediagnostic samples were analyzed for α-carotene, β-carotene, lycopene, lutein, zeaxanthin, β-cryptoxanthin, retinol, α-tocopherol, γ-tocopherol, and vitamin C. Breast cancer risk was computed according to hormone receptor status and age at diagnosis (proxy for menopausal status) by using conditional logistic regression and was further stratified by smoking status, alcohol consumption, and body mass index (BMI). All statistical tests were 2-sided. In quintile 5 compared with quintile 1, α-carotene (OR: 0.61; 95% CI: 0.39, 0.98) and β-carotene (OR: 0.41; 95% CI: 0.26, 0.65) were inversely associated with risk of ER- breast tumors. The other analytes were not statistically associated with ER- breast cancer. For estrogen receptor-positive (ER+) tumors, no statistically significant associations were found. The test for heterogeneity between ER- and ER+ tumors was statistically significant only for β-carotene (P-heterogeneity = 0.03). A higher risk of breast cancer was found for retinol in relation to ER-/progesterone receptor-negative tumors (OR: 2.37; 95% CI: 1.20, 4.67; P-heterogeneity with ER+/progesterone receptor positive = 0.06). We observed no statistically significant interaction between smoking, alcohol, or BMI and all investigated plasma analytes (based on tertile distribution). Our results indicate that higher concentrations of plasma β-carotene and α-carotene are associated with lower breast cancer risk of ER- tumors. YR 2016 FD 2016-01-20 LK http://hdl.handle.net/10668/9755 UL http://hdl.handle.net/10668/9755 LA en DS RISalud RD Apr 7, 2025