Lifetime physical activity and risk of breast cancer in pre-and post-menopausal women

Si, Si; Boyle, Terry; Heyworth, Jane; Glass, Deborah Catherine; Saunders, Christobel; Fritschi, Lin

doi:10.1007/s10549-015-3489-x

Cited by 22 publications

(17 citation statements)

References 35 publications

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“…In our study, physical activity was associated with a risk reduction of BC; this confirms the results of prospective studies in the world [ 51 – 53 ]. Conversely, studies conducted in Los Angeles and Western Australia, found the opposite or non-significant effect of physical activity with BC [ 54 , 55 ]. Our results could be explained by the fact that majority of Central African women do not use modern conveniences (car, machines, etc.)…”

Section: Discussionmentioning

confidence: 99%

Behavioral risk factors of breast cancer in Bangui of Central African Republic: A retrospective case-control study

et al. 2017

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Breast cancer is recognized as a major public health problem in developing countries; however, there is very little evidence of behavioral factors associated with breast cancer risk. This study was conducted to identify lifestyles as risk factors for breast cancer among Central African women. A case-control study was conducted with 174 cases confirmed histologically by the pathology unit of the National Laboratory and 348 age-matched controls. Data collection tools included a questionnaire with interviews and medical records of patients. Data were analyzed using SPSS software version 20. Odd ratio (OR) and 95% confidence intervals (95% CI) were obtained by unconditional logistic regression. In total, 522 women were studied with a mean age of 45.8 (SD = 13.4) years. By unconditional logistic regression model, women with breast cancer were more likely to have attained illiterate and elementary education level [11.23 (95% CI, 4.65–27.14) and 2.40 (95% CI, 1.15–4.99)], married [2.09 (95% CI, 1.18–3.71)], positive family history [2.31 (95% CI, 1.36–3.91)], radiation exposure [8.21 (95% CI, 5.04–13.38)], consumption charcuterie [10.82 (95% CI, 2.39–48.90)], fresh fish consumption [4.26 (95% CI, 1.56–11.65)], groundnut consumption [6.46 (95% CI, 2.57–16.27)], soybean consumption [16.74 (95% CI, 8.03–39.84)], alcohol [2.53 (95% CI, 1.39–4.60)], habit of keeping money in bras[3.57 (95% CI, 2.24–5.69)], overweight [5.36 (95% CI, 4.46–24.57)] and obesity [3.11(95% CI, 2.39–20.42)]. However, decreased risk of breast cancer was associated with being employed [0.32 (95% CI, 0.19–0.56)], urban residence [0.16 (95% CI, 0.07–0.37)], groundnut oil consumption [0.05 (95% CI, 0.02–0.14)], wine consumption [0.16 (95% CI, 0.09–0.26)], non habit of keeping cell phone in bras [0.56 (95% CI, 0.35–0.89)] and physical activity [0.71(95% CI, 0.14–0.84)]. The study showed that little or no education, marriage, positive family history of cancer, radiation exposure, charcuterie, fresh fish, groundnut, soybean, alcohol, habit of keeping money in bras, overweight and obesity were associated with breast cancer risk among Central African women living in Bangui. Women living in Bangui should be more cautious on the behavioral risk associated with breast cancer.

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Section: Discussionmentioning

confidence: 99%

Behavioral risk factors of breast cancer in Bangui of Central African Republic: A retrospective case-control study

et al. 2017

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“…The full methods have been described previously. (6) Briefly, participants were between two and four years post-diagnosis, between 18 and 80 years of age and residing in WA at the time of diagnosis, and had previously taken part in a case-control study (13). Breast cancer survivors who were currently receiving chemotherapy or radiotherapy, had experienced a recurrence of their breast cancer, or had been diagnosed with another cancer were ineligible.…”

Section: Methodsmentioning

confidence: 99%

Reallocating Time to Sleep, Sedentary Time, or Physical Activity: Associations with Waist Circumference and Body Mass Index in Breast Cancer Survivors

Boyle

Vallance

Buman

et al. 2017

Cancer Epidemiology, Biomarkers &Amp; Prevention

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Background Moderate-to-vigorous intensity physical activity (MVPA) has been inversely associated with waist circumference and body mass index among breast cancer survivors. Limited research has focused on behaviours that account for larger portions of the day [sleep, sedentary time, and light-intensity physical activity (LPA)]. In this study we investigated the interdependent associations of self-reported sleep, objectively-assessed prolonged and short bouts of sedentary time, total LPA and total MVPA with waist circumference and BMI in breast cancer survivors. Methods A cross-sectional sample of breast cancer survivors (N=256, mean age=60 years; mean time since diagnosis=3 years) wore an Actigraph® GT3X+ accelerometer during waking hours for seven days. Participants also completed the Pittsburgh Sleep Quality Index, and self-reported their waist circumference, height and weight. An isotemporal substitution approach was used in linear regression models to explore the associations of reallocating time to sleep, sedentary and active behaviours on waist circumference and BMI, after adjusting for potential confounders. Results Reallocating 30 minutes to total MVPA was associated with lower waist circumference when allocated from sleep (−2.50cm, 95% CI = −4.45cm, −0.56cm), prolonged sedentary time (−2.51cm, 95% CI = −4.38cm, −0.64cm) or LPA (−2.71cm, 95% CI = −4.72cm, −0.69cm). Reallocating 30 minutes of prolonged sedentary time to non-prolonged sedentary time was associated with lower waist circumference (−0.94cm, 95% CI = −1.79cm, −0.10cm). Similar results were observed for BMI. Conclusion/Impact Increasing MVPA levels and decreasing time spent in prolonged, unbroken sedentary bouts may be avenues for improving body composition in this population.

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“…Epidemiologic case-control studies have produced inconsistent results. Some have reported that high levels of occupational physical activity are associated with a reduced risk of breast cancer [3-19], whereas others have found an opposite or non-significant effect [20-28]. Few prospective studies have evaluated the association between occupational physical activity and breast cancer risk.…”

Section: Introductionmentioning

confidence: 99%

A prospective study of occupational physical activity and breast cancer risk

Ekenga

Parks

Sandler

2015

Cancer Causes Control

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Purpose Physical activity has been associated with reduced breast cancer risk, but studies of occupational activity have produced inconsistent results. The purpose of this study was to evaluate the relationship between occupational physical activity and breast cancer in a prospective study of women with a family history of breast cancer. Methods We studied breast cancer risk in 47,649 Sister Study participants with an occupational history. Information on occupational activity and breast cancer risk factors was collected during baseline interviews (2004-2009). Physical activity at each job was self-reported and categorized as mostly sitting, sitting and standing equally, mostly standing, and active. Multivariable Cox proportional hazards regression was used to evaluate associations between lifetime occupational activity and incident breast cancer, after adjusting for established risk factors and recreational activity. Results During follow-up, a total of 1,798 breast cancer diagnoses were reported. Compared with women who did not spend any time in active jobs, women who spent a high proportion (≥75%) of their working years in active jobs had a reduced risk of breast cancer (HR = 0.72; 95% CI = 0.52-0.98). Associations were strongest among overweight (HR = 0.64; 95% CI = 0.42-0.98) and postmenopausal (HR = 0.67; 95% CI = 0.45-0.98) women. Conclusions Occupational activity was associated with a reduced risk of breast cancer. Occupational activity is a domain of physical activity that should be further examined in studies of postmenopausal breast cancer risk. Additional research is necessary to better understand the mechanisms between occupational activity, body size, and breast cancer.

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Lifetime physical activity and risk of breast cancer in pre-and post-menopausal women

Cited by 22 publications

References 35 publications

Behavioral risk factors of breast cancer in Bangui of Central African Republic: A retrospective case-control study

Behavioral risk factors of breast cancer in Bangui of Central African Republic: A retrospective case-control study

Reallocating Time to Sleep, Sedentary Time, or Physical Activity: Associations with Waist Circumference and Body Mass Index in Breast Cancer Survivors

A prospective study of occupational physical activity and breast cancer risk

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