Risk Factors for Breast Cancer among Japanese Women in Tokyo : A Case-Control Study

Wakai, Kenji; Ohno, Yoshiyuki; Watanabe, Susumu; Sakamoto, Goi; Kasumi, Fujio; Suzuki, Sadao; Kubo-Fujiwara, Nakako

doi:10.2188/jea.4.65

Cited by 29 publications

(6 citation statements)

References 43 publications

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“…We identified 98 estimates of the association between ever breastfeeding and breast carcinoma risk (Tables and ). Ever breastfeeding was associated with 22% (OR 0.78, 95% CI 0.74–0.82) (Fig.…”

Section: Resultsmentioning

confidence: 99%

Breastfeeding and maternal health outcomes: a systematic review and meta‐analysis

et al. 2015

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AimTo evaluate the effect of breastfeeding on long-term (breast carcinoma, ovarian carcinoma, osteoporosis and type 2 diabetes mellitus) and short-term (lactational amenorrhoea, postpartum depression, postpartum weight change) maternal health outcomes.MethodsA systematic literature search was conducted in PubMed, Cochrane Library and CABI databases. Outcome estimates of odds ratios or relative risks or standardised mean differences were pooled. In cases of heterogeneity, subgroup analysis and meta-regression were explored.ResultsBreastfeeding >12 months was associated with reduced risk of breast and ovarian carcinoma by 26% and 37%, respectively. No conclusive evidence of an association between breastfeeding and bone mineral density was found. Breastfeeding was associated with 32% lower risk of type 2 diabetes. Exclusive breastfeeding and predominant breastfeeding were associated with longer duration of amenorrhoea. Shorter duration of breastfeeding was associated with higher risk of postpartum depression. Evidence suggesting an association of breastfeeding with postpartum weight change was lacking.ConclusionThis review supports the hypothesis that breastfeeding is protective against breast and ovarian carcinoma, and exclusive breastfeeding and predominant breastfeeding increase the duration of lactational amenorrhoea. There is evidence that breastfeeding reduces the risk of type 2 diabetes. However, an association between breastfeeding and bone mineral density or maternal depression or postpartum weight change was not evident.

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Section: Resultsmentioning

confidence: 99%

Breastfeeding and maternal health outcomes: a systematic review and meta‐analysis

et al. 2015

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“…However, history of breastfeeding was limited to that for the last child in one (13) and parity or number of births was not considered as a confounding factor in the other (17). Remaining three studies assessed the association of ever breastfeeding or duration of breastfeeding with the risk of breast cancer after considering number of births (8,11,12). Yoo et al (8) observed a non-significant, 38% reduction of risk for ever having breastfed and the trend for decreasing risk with increasing duration of breastfeeding was statistically significant.…”

Section: Main Features and Commentsmentioning

confidence: 99%

Breastfeeding and Breast Cancer Risk: An Evaluation Based on a Systematic Review of Epidemiologic Evidence Among the Japanese Population

Nagata

Mizoue

Tanaka

et al. 2011

Japanese Journal of Clinical Oncology

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Objective:We reviewed epidemiological studies on breastfeeding and breast cancer among Japanese women. This report is part of a series of articles written by our research group, whose aim was to evaluate the existing evidence concerning the association between healthrelated lifestyles and cancer. Methods: Original data were obtained from MEDLINE searches using PubMed or from searches of the Ichushi database, complemented by manual searches. Evaluation of associations was based on the strength of evidence and the magnitude of association, together with biological plausibility. Results: Three cohort studies and five case -control studies were identified. Cohort studies failed to find a significant inverse association between breastfeeding and the risk of breast cancer. Most of the case -control studies observed a statistically significant or non-significant risk reduction for women who ever had breastfed or for women with a longer duration of breastfeeding. Experimental studies have supported the biological plausibility of a protective effect of breastfeeding on breast cancer risk. Conclusions: We conclude that breastfeeding possibly decreases the risk of breast cancer among Japanese women.

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“…Because of scarce evidence from epidemiologic studies on Japanese women, the association between alcohol consumption and breast cancer risk remains elusive in Japan. One case‐control study observed a significant 1.3‐fold increase in the risk of breast cancer among daily drinkers compared to nondrinkers,19 whereas the other 2 case‐control studies found no association of alcohol use with breast cancer risk in postmenopausal women 20, 21. In the first large cohort study on lifestyle factors and cancer (1965–1980) in Japan, alcohol use was not associated with the risk of death from breast cancer 22…”

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confidence: 99%

Prospective study of alcohol consumption and breast cancer risk in Japanese women

et al. 2005

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Epidemiologic evidence is lacking for the association between alcohol consumption and the risk of breast cancer in Japanese women. We addressed this association in a prospective cohort study with an average follow-up of 7.6 years. At baseline (1988-1990), cohort participants completed a self-administered questionnaire that included alcohol use, reproductive history and hormone use. The women were followed up for breast cancer incidence through December 31, 1997. Cox proportional hazards models were used to calculate relative risks (RRs) and 95% confidence intervals (CIs) for breast cancer incidence and any association with alcohol consumption. During a follow-up of 271,412 person-years, we identified 151 women with breast cancer, of whom 45 were current drinkers and 11 drank > or =15 g of alcohol/day. After adjustment for age and other potential risk factors for breast cancer, the RR for current drinkers was 1.27 (95% CI 0.87-1.84) compared to nondrinkers. Average alcohol intake of <15 g/day did not significantly increase the risk for breast cancer. However, risk was significantly increased for women who consumed > or =15 g/day of alcohol (RR = 2.93, 95% CI 1.55-5.54). Age at starting drinking and frequency of consumption per week were not significantly associated with breast cancer risk. Our cohort study demonstrated that Japanese women who consume at least a moderate amount of alcohol have an increased risk of breast cancer.

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Risk Factors for Breast Cancer among Japanese Women in Tokyo : A Case-Control Study

Cited by 29 publications

References 43 publications

Breastfeeding and maternal health outcomes: a systematic review and meta‐analysis

Breastfeeding and maternal health outcomes: a systematic review and meta‐analysis

Breastfeeding and Breast Cancer Risk: An Evaluation Based on a Systematic Review of Epidemiologic Evidence Among the Japanese Population

Prospective study of alcohol consumption and breast cancer risk in Japanese women

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