Abstract:
OBJECTIVES:To investigate the association between intake of fish and n-3 polyunsaturated fatty acids (n-3 PUFA) and the risk of breast cancer and to evaluate the potential dose-response relation. DESIGN:Meta-analysis and systematic review of prospective cohort studies. DATA SOURCES:PubMed and Embase up to December 2012 and references of retrieved relevant articles. ELIGIBILITY CRITERIA FOR SELECTING STUDIES:Prospective cohort studies with relative risk and 95% confidence intervals for breast cancer according to fish intake, n-3 PUFA intake, or tissue biomarkers. RESULTS:Twenty six publications, including 20,905 cases of breast cancer and 883,585 participants from 21 independent prospective cohort studies were eligible. Eleven articles (13,323 breast cancer events and 687,770 participants) investigated fish intake, 17 articles investigated marine n-3 PUFA (16,178 breast cancer events and 527,392 participants), and 12 articles investigated alpha linolenic acid (14,284 breast cancer events and 405,592 participants). Marine n-3 PUFA was associated with 14% reduction of risk of breast cancer (relative risk for highest v lowest category 0.86 (95% confidence interval 0.78 to 0.94), I(2)=54), and the relative risk remained similar whether marine n-3 PUFA was measured as dietary intake (0.85, 0.76 to 0.96, I(2)=67%) or as tissue biomarkers (0.86, 0.71 to 1.03, I(2)=8%). Subgroup analyses also indicated that the inverse association between marine n-3 PUFA and risk was more evident in studies that did not adjust for body mass index (BMI) (0.74, 0.64 to 0.86, I(2)=0) than in studies that did adjust for BMI (0.90, 0.80 to 1.01, I(2)=63.2%). Dose-response analysis indicated that risk of breast cancer was reduced by 5% per 0.1g/day (0.95, 0.90 to 1.00, I(2)=52%) or 0.1% energy/day (0.95, 0.90 to 1.00, I(2)=79%) increment of dietary marine n-3 PUFA intake. No significant association was observed for fish intake or exposure to alpha linolenic acid. CONCLUSIONS:Higher consumption of dietary marine n-3 PUFA is associated with a lower risk of breast cancer. The associations of fish and alpha linolenic acid intake with risk warrant further investigation of prospective cohort studies. These findings could have public health implications with regard to prevention of breast cancer through dietary and lifestyle interventions.
journal_name
BMJjournal_title
BMJ (Clinical research ed.)authors
Zheng JS,Hu XJ,Zhao YM,Yang J,Li Ddoi
10.1136/bmj.f3706subject
Has Abstractpub_date
2013-06-27 00:00:00pages
f3706eissn
0959-8138issn
1756-1833journal_volume
346pub_type
杂志文章,meta分析,评审abstract:OBJECTIVE:To determine the global capacity (availability, accessibility, quality, and affordability) to deliver kidney replacement therapy (dialysis and transplantation) and conservative kidney management. DESIGN:International cross sectional survey. SETTING:International Society of Nephrology (ISN) survey of 182 cou...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.l5873
更新日期:2019-10-31 00:00:00
abstract:OBJECTIVE:To investigate socioeconomic variation among young women in the risk of hospital admission for diseases (including neoplasms) of the female genital system and breast and for the common surgical procedures of dilatation and curettage and hysterectomy. DESIGN:Large nationally representative cohort study with i...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.311.7009.840
更新日期:1995-09-30 00:00:00
abstract:OBJECTIVE:To determine the prevalence of asthma in cohorts of Finnish young men in the period 1926-89. DESIGN:A retrospective analysis using reports and statistics of Finnish defence forces. SETTING:Call up examinations of candidates for military conscription and examination of conscripts discharged because of poor h...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.301.6746.266
更新日期:1990-08-04 00:00:00
abstract:OBJECTIVES:To elucidate current trends and geographical patterns in the sex ratio at birth and in the population aged under 20 in China and to determine the roles played by sex selective abortion and the one child policy. DESIGN:Analysis of household based cross sectional population survey done in November 2005. SETT...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,多中心研究
doi:10.1136/bmj.b1211
更新日期:2009-04-09 00:00:00
abstract:OBJECTIVES:To provide insight into factors that contribute to the anxiety reported in a quantitative study of the psychological effect of screening for type 2 diabetes. To explore expectations of and reactions to the screening experience of patients with positive, negative, and intermediate results. DESIGN:Prospective...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,多中心研究,随机对照试验
doi:10.1136/bmj.39308.392176.BE
更新日期:2007-09-08 00:00:00
abstract:OBJECTIVE:To identify and estimate the population costs and effects of a selected set of enforcement strategies for reducing the burden of road traffic injuries in developing countries. DESIGN:Cost effectiveness analysis based on an epidemiological model. SETTING:Two epidemiologically defined World Health Organizatio...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.e612
更新日期:2012-03-02 00:00:00
abstract:OBJECTIVE:To determine the risk of chronic kidney disease in patients with psoriasis. DESIGN:Population based cohort study and nested cross sectional study. SETTING:Electronic medical records database based in United Kingdom. PARTICIPANTS:Cohort study: patients with psoriasis aged 18-90 each matched to up to five pa...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.f5961
更新日期:2013-10-15 00:00:00
abstract::The numbers of patients being admitted to hospital with aortic aneurysms have increased recently. A study was carried out to try to find out whether this was a true increase in incidence or whether it could be attributable to more accurate diagnosis and better surgical techniques. From analyses of routine statistics i...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.298.6665.33
更新日期:1989-01-07 00:00:00
abstract::In Oregon, Planned Parenthood and a group of physicians who perform abortions have filed a civil suit against several anti-abortion groups individuals. The suit seeks $200 million in damages and an injunction to bar the defendants from posting information on the Internet that threatens the lives and well-being of the...
journal_title:BMJ (Clinical research ed.)
pub_type: 新闻
doi:10.1136/bmj.318.7178.214a
更新日期:1999-01-23 00:00:00
abstract:OBJECTIVE:To assess the effects of Helicobacter pylori treatment, vitamin supplementation, and garlic supplementation in the prevention of gastric cancer. DESIGN:Blinded randomized placebo controlled trial. SETTING:Linqu County, Shandong province, China. PARTICIPANTS:3365 residents of a high risk region for gastric ...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,随机对照试验
doi:10.1136/bmj.l5016
更新日期:2019-09-11 00:00:00
abstract:OBJECTIVE:To investigate the association between cerebral palsy and direct evidence for perinatal exposure to neurotropic viruses. DESIGN:Population based case-control study. SETTING:Adelaide Women's and Children's Hospital Research Laboratory. PARTICIPANTS AND MAIN OUTCOME MEASURES:Newborn screening cards of 443 wh...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.38668.616806.3A
更新日期:2006-01-14 00:00:00
abstract:OBJECTIVES:To document the extent to which maternity data are collected and how they are recorded, and to identify problems that may affect their availability throughout the NHS. METHODS:Postal survey in September 1997 with structured questionnaires. SETTING:207 NHS trusts with maternity units in England. PARTICIPAN...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.319.7210.619
更新日期:1999-09-04 00:00:00
abstract::A doctor who performed an abortion in Poland faces two years in prison and the loss of his medical license for up to 10 years if he is found guilty of violating the new abortion laws introduced in 1993 after a lengthy campaign by the Catholic church and the Christian Democratic Union party. The new laws permit aborti...
journal_title:BMJ (Clinical research ed.)
pub_type: 新闻
doi:10.1136/bmj.310.6994.1556a
更新日期:1995-06-17 00:00:00
abstract:OBJECTIVE:To evaluate the effectiveness of a monovalent rotavirus vaccine against severe rotavirus disease and to assess its impact on diarrhoea in children aged less than 2 years after national introduction in El Salvador, a low-middle income country in Central America. DESIGN:Matched case-control study. SETTING:Sev...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,多中心研究
doi:10.1136/bmj.c2825
更新日期:2010-06-15 00:00:00
abstract::The disease management approach to patient care seeks to coordinate resources across the healthcare delivery system. The growing interest in evidence based medicine and outcomes, and a commitment to integrated care across the primary, secondary, and community care sectors, all contribute to making disease management a...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.315.7099.50
更新日期:1997-07-05 00:00:00
abstract:OBJECTIVES:To determine the impact on teenage pregnancy of interventions that address the social disadvantage associated with early parenthood and to assess the appropriateness of such interventions for young people in the United Kingdom. DESIGN:Systematic review, including a statistical meta-analysis of controlled tr...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,meta分析,评审
doi:10.1136/bmj.b4254
更新日期:2009-11-12 00:00:00
abstract:OBJECTIVE:To evaluate the clinical benefit of lipid lowering drug treatment in patients with and without diabetes mellitus, for primary and secondary prevention. DESIGN:Systematic review and meta-analysis. DATA SOURCES:Cochrane, Medline, Embase, and reference lists up to April 2004. STUDY SELECTION:Randomised, place...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,meta分析,评审
doi:10.1136/bmj.38793.468449.AE
更新日期:2006-05-13 00:00:00
abstract::In order to determine whether the loss in bone density seen in users of depot medroxyprogesterone acetate is reversible, a comparative study was undertaken in three groups of women. Group 1 consisted of 14 women who had used the contraceptive for at least 3 years and then discontinued use. Group 2 was 22 longterm us...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.308.6923.247
更新日期:1994-01-22 00:00:00
abstract:UNLABELLED:OBJECTIVE--To measure needs for care of patients aged 18-65 years with major mental illness. DESIGN:Identification of everyone in one area seen by a health professional within the previous five years because of a psychotic disorder. Interview of a one in three sample of patients and their main carers with t...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.312.7046.1582
更新日期:1996-06-22 00:00:00
abstract::In the existing WHO guidelines, complementary feeding at 4-6 months is advocated. However, many nutrition specialists believe that these guidelines lead to complementary foods being offered from the age of 3 months, or even earlier, subsequently suggesting that the WHO should change its recommendations to about 6 mon...
journal_title:BMJ (Clinical research ed.)
pub_type: 新闻
doi:
更新日期:2000-09-09 00:00:00
abstract::The benefits to medical practitioners of using the Internet are growing rapidly as the Internet becomes easier to use and ever more biomedical resources become available on line. The Internet is the largest computer network in the world; it is also a virtual community, larger than many nation states, with its own rule...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,评审
doi:10.1136/bmj.311.7017.1422
更新日期:1995-11-25 00:00:00
abstract:OBJECTIVES:To investigate whether sending patients a copy of their referral letter can reduce non-attendance at outpatient departments. DESIGN:Blinded randomised controlled trial. SETTING:13 general practices in Exeter, Devon. SUBJECTS:2078 new consultant referrals from 26 doctors. MAIN OUTCOME MEASURES:Non-attenda...
journal_title:BMJ (Clinical research ed.)
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1136/bmj.318.7195.1392
更新日期:1999-05-22 00:00:00
abstract:OBJECTIVE:To compare the mortality of patients in a palliative care unit on working days with that on weekends and public holidays. DESIGN:Retrospective database study. SETTING:Palliative care unit in Germany. POPULATION:All admissions to palliative care unit between 1 January 1997 and 31 December 2008. MAIN OUTCOM...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.g7370
更新日期:2014-12-16 00:00:00
abstract::Medical audit has its critics, who point to the large sums of NHS cash that seem to be disappearing down a medical plughole. These criticisms are recognised by medical audit advisory groups but there are many reasons why the work of these groups has not yet resulted in many publications in journals or bumped up health...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.309.6947.98
更新日期:1994-07-09 00:00:00
abstract:OBJECTIVE:To assess the effect of weight loss induced by a very low energy diet on moderate and severe obstructive sleep apnoea in obese men. Design Single centre, two arm, parallel, randomised, controlled, open label trial. Blocked randomisation procedure used for treatment allocation. Setting Outpatient obesity clini...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,随机对照试验
doi:10.1136/bmj.b4609
更新日期:2009-12-03 00:00:00
abstract:OBJECTIVE:To study the processes involved in and impact of mergers between NHS trusts, including the effect on management costs. DESIGN:Cross sectional study involving in depth interviews and documentary analysis; case study to compare savings in management costs between case trusts and control trusts. SETTING:Nine t...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,多中心研究
doi:10.1136/bmj.325.7358.246
更新日期:2002-08-03 00:00:00
abstract:OBJECTIVE:To determine the effect of combinations of statins, aspirin, beta blockers, and angiotensin converting enzyme inhibitors in the secondary prevention of all cause mortality in patients with ischaemic heart disease. DESIGN:Open prospective cohort study with nested case-control analysis. SETTING:1.18 million p...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,多中心研究
doi:10.1136/bmj.330.7499.1059
更新日期:2005-05-07 00:00:00
abstract::Lifetime fertility, abortion rates, and the proportion of pregnancies resulting in induced abortion were investigated in 105 district health authorities in England. In 1995, a total of 147,851 abortions occurred among women living in England, compared with 613,257 live births; a ratio of 1:4. This was equivalent to ...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.316.7146.1711
更新日期:1998-06-06 00:00:00
abstract:OBJECTIVE:To estimate changes in the risk of autism and assess the relation of autism to the mumps, measles, and rubella (MMR) vaccine. DESIGN:Time trend analysis of data from the UK general practice research database (GPRD). SETTING:General practices in the United Kingdom. SUBJECTS:Children aged 12 years or younger...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章
doi:10.1136/bmj.322.7284.460
更新日期:2001-02-24 00:00:00
abstract:OBJECTIVE:To evaluate the relative efficacy of the World Health Organization 2005 campaign (WHO-5) and other interventions to promote hand hygiene among healthcare workers in hospital settings and to summarize associated information on use of resources. DESIGN:Systematic review and network meta-analysis. DATA SOURCES...
journal_title:BMJ (Clinical research ed.)
pub_type: 杂志文章,meta分析,评审
doi:10.1136/bmj.h3728
更新日期:2015-07-28 00:00:00