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Title: Risk prediction for estrogen receptor-specific breast cancers in two large prospective cohorts
Author: Li, Kuanrong
Anderson, Garnet
Viallon, Vivian
Arveux, Patrick
Kvaskoff, Marina
Fournier, Agnès
Krogh, Vittorio
Tumino, Rosario
Sánchez, Maria Jose
Ardanaz, Eva
Chirlaque, María Dolores
Agudo, Antonio
Muller, David C.
Smith, Todd
Tzoulaki, Ioanna
Key, Timothy J.
Bueno de Mesquita, H. Bas
Trichopoulou, Antonia
Bamia, Christina
Orfanos, Philippos
Kaaks, Rudolf
Hüsing, Anika
Fortner, Renée T.
Zeleniuch Jacquotte, Anne
Sund, Malin
Dahm, Christina C.
Overvad, Kim
Aune, Dagfinn
Weiderpass, Elisabete
Romieu, Isabelle
Riboli, Elio
Gunter, Marc J.
Dossus, Laure
Prentice, Ross L.
Ferrari, Pietro
Keywords: Càncer de mama
Breast cancer
Issue Date: 3-Dec-2018
Publisher: BioMed Central
Abstract: Background: Few published breast cancer (BC) risk prediction models consider the heterogeneity of predictor variables between estrogen-receptor positive (ER+) and negative (ER-) tumors. Using data from two large cohorts, we examined whether modeling this heterogeneity could improve prediction. Methods: We built two models, for ER+ (ModelER+) and ER- tumors (ModelER-), respectively, in 281,330 women (51% postmenopausal at recruitment) from the European Prospective Investigation into Cancer and Nutrition cohort. Discrimination (C-statistic) and calibration (the agreement between predicted and observed tumor risks) were assessed both internally and externally in 82,319 postmenopausal women from the Women’s Health Initiative study. We performed decision curve analysis to compare ModelER+ and the Gail model (ModelGail) regarding their applicability in risk assessment for chemoprevention. Results: Parity, number of full-term pregnancies, age at first full-term pregnancy and body height were only associated with ER+ tumors. Menopausal status, age at menarche and at menopause, hormone replacement therapy, postmenopausal body mass index, and alcohol intake were homogeneously associated with ER+ and ER- tumors. Internal validation yielded a C-statistic of 0.64 for ModelER+ and 0.59 for ModelER-. External validation reduced the C-statistic of ModelER+ (0.59) and ModelGail (0.57). In external evaluation of calibration, ModelER+ outperformed the ModelGail: the former led to a 9% overestimation of the risk of ER+ tumors, while the latter yielded a 22% underestimation of the overall BC risk. Compared with the treat-all strategy, ModelER+ produced equal or higher net benefits irrespective of the benefit-to-harm ratio of chemoprevention, while ModelGail did not produce higher net benefits unless the benefit-to-harm ratio was below 50. The clinical applicability, i.e. the area defined by the net benefit curve and the treat-all and treat-none strategies, was 12.7 × 10− 6 for ModelER+ and 3.0 × 10− 6 for ModelGail. Conclusions: Modeling heterogeneous epidemiological risk factors might yield little improvement in BC risk prediction. Nevertheless, a model specifically predictive of ER+ tumor risk could be more applicable than an omnibus model in risk assessment for chemoprevention.
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It is part of: Breast Cancer Research, 2018, vol. 20
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Appears in Collections:Articles publicats en revistes (Institut d'lnvestigació Biomèdica de Bellvitge (IDIBELL))

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