RT Journal Article T1 Implications of Lifestyle and Occupational Factors on the Risk of Breast Cancer in Shiftwork Nurses A1 Fagundo-Rivera, Javier A1 Allande-Cussó, Regina A1 Ortega-Moreno, Mónica A1 García-Iglesias, Juan Jesús A1 Romero, Adolfo A1 Ruiz-Frutos, Carlos A1 Gómez-Salgado, Juan K1 Breast cancer K1 Night work K1 Shift work K1 Health personnel K1 Occupational disease K1 Working conditions K1 Prevention K1 Carcinogens K1 Neoplasias de la mama K1 Horario de trabajo por turnos K1 Personal de salud K1 Enfermedades profesionales K1 Condiciones de trabajo K1 Prevención de enfermedades K1 Carcinógenos K1 Enfermeras K1 Equilibrio entre vida personal y laboral K1 Trastornos cronobiológicos AB Shift work that involves circadian disruption has been highlighted as a likely carcinogenic factor for breast cancer in humans. Also, unhealthy lifestyle habits observed in night work nurses could be causally related to an increase in the incidence of estrogen-positive breast tumours in this population. Assessing baseline risk of breast cancer in nurses is essential. The objective of this study was to analyze the risk of breast cancer that nurses had in relation to their lifestyle and labour factors related to shift work. A cross-sectional descriptive study through a questionnaire about sociodemographic variables, self-perception of health, and working life was designed. The sample consisted of 966 nurses. The relationship between variables was tested. A binary logistic regression and a classification and regression tree were performed. The most significant labour variables in relation to the risk of breast cancer were the number of years worked (more than 16 years; p < 0.01; OR = 8.733, 95% CI = 2.811, 27.134) and the total years performing more than 3 nights per month (10 or more years; p < 0.05; OR = 2.294, 95% CI = 1.008, 5.220). Also, the nights worked throughout life (over 500; OR = 4.190, 95% CI = 2.118, 8.287) were significant in the analysis. Nurses who had or ever had breast cancer valued their self-perceived health more negatively (p < 0.001) and referred a lower quality of sleep (p < 0.001) than the non-cases nurses. The occupational factors derived from night work could have several impacts on nurses' health and their family-work balance. Promoting healthy lifestyles, informing about shift work risks, and adjusting shift work schedules are critical methods to decrease the possible effects of circadian disruption in nurses. PB MDPI YR 2021 FD 2021-05-30 LK http://hdl.handle.net/10668/4602 UL http://hdl.handle.net/10668/4602 LA en NO Fagundo-Rivera J, Allande-Cussó R, Ortega-Moreno M, García-Iglesias JJ, Romero A, Ruiz-Frutos C, et al. Implications of Lifestyle and Occupational Factors on the Risk of Breast Cancer in Shiftwork Nurses. Healthcare. 2021 May 30;9(6):649 DS RISalud RD Apr 5, 2025