RT Journal Article T1 Predicting Circulating CA125 Levels among Healthy Premenopausal Women. A1 Sasamoto, Naoko A1 Babic, Ana A1 Rosner, Bernard A A1 Fortner, Renée T A1 Vitonis, Allison F A1 Yamamoto, Hidemi A1 Fichorova, Raina N A1 Tjønneland, Anne A1 Hansen, Louise A1 Overvad, Kim A1 Kvaskoff, Marina A1 Fournier, Agnès A1 Romana Mancini, Francesca A1 Boeing, Heiner A1 Trichopoulou, Antonia A1 Peppa, Eleni A1 Karakatsani, Anna A1 Palli, Domenico A1 Pala, Valeria A1 Mattiello, Amalia A1 Tumino, Rosario A1 Grasso, Chiara C A1 Onland-Moret, N Charlotte A1 Weiderpass, Elisabete A1 Quirós, J Ramón A1 Lujan-Barroso, Leila A1 Rodriguez-Barranco, Miguel A1 Colorado-Yohar, Sandra A1 Barricarte, Aurelio A1 Dorronsoro, Miren A1 Idahl, Annika A1 Lundin, Eva A1 Sartor, Hanna A1 Khaw, Kay-Tee A1 Key, Timothy J A1 Muller, David A1 Riboli, Elio A1 Gunter, Marc J A1 Dossus, Laure A1 Kaaks, Rudolf A1 Cramer, Daniel W A1 Tworoger, Shelley S A1 Terry, Kathryn L AB Cancer antigen 125 (CA125) is the most promising ovarian cancer screening biomarker to date. Multiple studies reported CA125 levels vary by personal characteristics, which could inform personalized CA125 thresholds. However, this has not been well described in premenopausal women. We evaluated predictors of CA125 levels among 815 premenopausal women from the New England Case Control Study (NEC). We developed linear and dichotomous (≥35 U/mL) CA125 prediction models and externally validated an abridged model restricting to available predictors among 473 premenopausal women in the European Prospective Investigation into Cancer and Nutrition Study (EPIC). The final linear CA125 prediction model included age, race, tubal ligation, endometriosis, menstrual phase at blood draw, and fibroids, which explained 7% of the total variance of CA125. The correlation between observed and predicted CA125 levels based on the abridged model (including age, race, and menstrual phase at blood draw) had similar correlation coefficients in NEC (r = 0.22) and in EPIC (r = 0.22). The dichotomous CA125 prediction model included age, tubal ligation, endometriosis, prior personal cancer diagnosis, family history of ovarian cancer, number of miscarriages, menstrual phase at blood draw, and smoking status with AUC of 0.83. The abridged dichotomous model (including age, number of miscarriages, menstrual phase at blood draw, and smoking status) showed similar AUCs in NEC (0.73) and in EPIC (0.78). We identified a combination of factors associated with CA125 levels in premenopausal women. Our model could be valuable in identifying healthy women likely to have elevated CA125 and consequently improve its specificity for ovarian cancer screening. PB American Association for Cancer Research YR 2019 FD 2019-04-04 LK http://hdl.handle.net/10668/13790 UL http://hdl.handle.net/10668/13790 LA en NO Sasamoto N, Babic A, Rosner BA, Fortner RT, Vitonis AF, Yamamoto H, et al. Predicting Circulating CA125 Levels among Healthy Premenopausal Women. Cancer Epidemiol Biomarkers Prev. 2019 Jun;28(6):1076-1085. DS RISalud RD Apr 7, 2025