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The impact of night shift work on breast cancer
Results from the Burden of Occupational Cancer in Canada Study Background: We estimated the proportion and number of female breast cancer cases in Canada attributable to night shift work, a probable cause of breast cancer. Methods: Levin's equation was used to calculate population attributable fractions (PAFs) among Canadian women who ever worked night/rotating shifts from 1961 to 2000, accounting for labor turnover and survival to the year 2011. The calculated PAFs were applied to 2011 Canadian breast cancer incidence statistics to obtain the number of attributable cases. Results: Approximately...
La vie cinq ans après un diagnostic de cancer
Une deuxième enquête VICAN5 (cinq ans après le diagnostic) a été réalisée en 2015, dans la continuité de l'enquête VICAN2 réalisée en 2012 auprès de malades vivant en France métropolitaine. En continuant de s'appuyer sur la trame développée dans la restitution des données de la première enquête, les résultats présentés dans cet ouvrage tentent d'évaluer les changements survenus dans la vie des personnes au cours de cet intervalle allongé...
Conséquences de la survenue du cancer sur les parcours professionnels
Une analyse sur données médico-administratives Ce rapport étudie les effets à court et moyen termes de la survenue d'un cancer sur l'emploi et l'activité. Il utilise la base de données Hygie, produite par l'Irdes à partir des données administratives de la Caisse nationale de l'Assurance maladie et de la Caisse nationale d'assurance vieillesse. Hygie permet de reconstituer la carrière de l'individu ainsi que les événements de santé. Une première partie exploite la dimension rétrospective...
949 Shiftwork and breast cancer: epidemiology, burden, and implications for prevention
Introduction: Approximately one in five workers globally work night, evening, or rotating shifts. Shiftwork involving circadian disruption is a probable carcinogen for breast cancer. Our objective was to synthesise the current state of the epidemiological literature, report on shiftwork-associated breast cancer burden in Canada, and discuss implications for prevention. Methods: A search was conducted for meta-analyses accompanied by a systematic review, published from 2010–2017, that included at least one meta-risk estimate (mRE) for breast cancer associated with any permanent/rotating night...
Night-shift work and hematological cancers
A population based case-control study in three Nordic countries Objective: The aim of this case–control study was to assess the effect of night-shift work on the risk of hematological cancers. Methods: The study included 39 371 leukemia, 56 713 non-Hodgkin lymphoma, 9322 Hodgkin lymphoma, and 26 188 multiple myeloma cases diagnosed between 1961 and 2005 in Finland, Sweden, and Iceland. Five controls for each case were selected from the Nordic Occupational Cancer Study (NOCCA) cohort, matched by year of birth, sex and country. Night-shift exposure was assessed by using the NOCCA job-exposure...
Night Shift Work Increases the Risks of Multiple Primary Cancers in Women
A Systematic Review and Meta-analysis of 61 Articles A growing number of studies have examined associations between night shift work and the risks of common cancers among women, with varying conclusions. We did a meta-analysis to identify whether long-term night shift work increased the risks of common cancers in women. We enrolled 61 articles involving 114,628 cases and 3,909,152 participants from Europe, North America, Asia, and Australia. Risk estimates were performed with a random-effect model or a fixed-effect model. Subgroup analyses and meta-regression analyses about breast cancer were conducted...
Night Shift Work Increases the Risks of Multiple Primary Cancers in Women
A Systematic Review and Meta-analysis of 61 Articles A growing number of studies have examined associations between night shift work and the risks of common cancers among women, with varying conclusions. We did a meta-analysis to identify whether long-term night shift work increased the risks of common cancers in women. We enrolled 61 articles involving 114,628 cases and 3,909,152 participants from Europe, North America, Asia, and Australia. Risk estimates were performed with a random-effect model or a fixed-effect model. Subgroup analyses and meta-regression analyses about breast cancer were conducted...
A review of the impact of shift-work on cancer
Summary of the evidence for practitioners Shift work that involves disruption to the body's circadian rhythm is classified as probably carcinogenic to humans based on limited evidence in humans and sufficient evidence in experimental animals. This article draws together the available information from the epidemiological, mechanistic and health and safety practice research to provide advice for practitioners. There is evidence that the increase in breast cancer risk amongst women who have worked night shifts is relatively modest and we cannot exclude the possibility that there is no cancer risk...
Shift work and the incidence of prostate cancer
A 10-year follow-up of a German population-based cohort study Objectives: We investigated the association of shift and night work with the incidence of prostate cancer using data of the population-based prospective Heinz Nixdorf Recall Study from the highly industrialized Ruhr area in Germany. Methods: Participants of the baseline survey were recruited between 2000–2003. A follow-up survey including, a detailed interview on shift and night work, was conducted from 2011–2014. We included 1757 men who did not report a history of prostate cancer at baseline. We assessed shift- and night...
Outdoor Light at Night and Breast Cancer Incidence in the Nurses’ Health Study II
Background: Animal and epidemiologic studies suggest that exposure to light at night (LAN) may disrupt circadian patterns and decrease nocturnal secretion of melatonin, which may disturb estrogen regulation, leading to increased breast cancer risk.Objectives: We examined the association between residential outdoor LAN and breast cancer incidence using data from the nationwide U.S.-based Nurses' Health Study II cohort.Methods:We followed 109,672 women from 1989 through 2013. Cumulative LAN exposure was estimated using time-varying satellite data for a composite of persistent nighttime illumination...
Rotating night shift work and risk of breast cancer in the Nurses' Health Studies
In 2007, the International Agency for Research on Cancer declared shift work involving circadian disruption to be a “probable” carcinogen (group 2A), noting that human evidence was limited. This study examined associations between rotating night shift work and breast cancer risk in two prospective cohorts, the Nurses' Health Studies (NHS: 1988–2012, n = 78,516; NHS2: 1989–2013, n = 114,559), with 9,541 incident invasive breast malignancies and 24 years of follow-up. Women in NHS with 30+ years of shift work had no increased risk of breast cancer (Hazard ratio (HR) =...
Shift work and colorectal cancer risk in the MCC-Spain
Case-control study The role of shift work in colorectal carcinogenesis is unknown. This research examined the association between lifetime shift work exposure in a variety of occupations and colorectal cancer risk in the MCC-Spain case–control study. Long-term rotating shift work was associated with an increased risk for colorectal cancer. These findings support the need of cancer preventive measures in shift workers. Source: Papantoniou, K., Castaño-Vinyals, G., Espinosa, A., Turner, M. C., Alonso-Aguado, M. H., Martin, V., ... & Ardanaz, E. (2017). Scandinavian Journal of Work...
Lifetime report of perceived stress at work and cancer among men
A case-control study in Montreal, Canada Background: The association between perceived workplace psychological stress, over the entire work career, and cancer among men has never been assessed. This was explored in the context of a population-based case-control study conducted in Montreal, Canada. Methods: 3103 incident cancer cases (11 types) diagnosed in 1979–1985 and 512 population controls were interviewed. Subjects described in detail each job held during their lifetime, including the occurrence of stress, and its reason. Logistic regression estimated odds ratios (OR) and 95% confidence...
Short-term effects of night shift work on breast cancer risk
A cohort study of payroll data The epidemiological evidence of an association between night shifts and breast cancer is limited. Studies have relied on self-reported information on working time, which may have inflated findings by recall bias. This study included individual, objective, and detailed information on working time from pay roll registers. There is no increased risk of breast cancer following recent night shift work. Source: Vistisen HT, Garde AH, Frydenberg M, Christiansen P, Hansen ÅM, Hansen J, Bonde JPE, Kolstad HA. (2016). Scand J Work Environ Health . http://dx.doi.org/10...
Breast cancer link to shiftwork confirmed
Nearly 2,000 women contract breast cancer every year in the UK because they work night shifts, according to a new report. The figure, published by the Health and Safety Executive (HSE), is based on 2005 data and attributes 1,969 new cases of breast cancer and 555 deaths from the disease that year to shiftwork. It says: 'The estimate of nearly 2,000 breast cancer registrations due to shiftwork in our study is 54 per cent of all female occupationally-related cancer registrations.' Professor Andrew Watterson, head of occupational health research at Stirling University, urged HSE last year...

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