Breast cancer and breastfeeding: collaborative reanalysis of individual data from 47 epidemiological studies in 30 countries, including 50 302 women with breast cancer and 96 973 women without the disease

@article{Mller2002BreastCA,
  title={Breast cancer and breastfeeding: collaborative reanalysis of individual data from 47 epidemiological studies in 30 countries, including 50 302 women with breast cancer and 96 973 women without the disease},
  author={Torgil R. M{\"o}ller and Hampus Olsson and Jonas Ranstam},
  journal={The Lancet},
  year={2002},
  volume={360},
  pages={187-195}
}

Breastfeeding and incidence of breast cancers in the UK Women's Cohort Study

TLDR
There is no evidence of any association between breastfeeding and the risk of breast cancer in the UK Women’s Cohort Study, and the biological mechanisms underlying these associations are uncertain.

Breastfeeding reduces breast cancer risk: a case–control study in Tunisia

TLDR
An inverse association between breastfeeding and breast cancer risk is supported in a case–control study in Tunisia between 2006 and 2009 and Stratification by menopausal status showed a reduced risk of breast cancer associated with a longer duration of breastfeeding for both pre- and postmenopausal women.

Breast cancer risk among women with long-standing lactation and reproductive parameters at low risk level: a case–control study in Northern Tanzania

TLDR
Long-standing lactation and reproductive behaviour are associated with a lower breast cancer risk in the region and should be included in preventive efforts on reproductive and breastfeeding behaviour.

Breastfeeding and breast cancer: a case-control study in Southern Brazil.

TLDR
It is found that breastfeeding did not have a protective effect against breast cancer in Southern Brazil and the main study variables were occurrence of breastfeeding and duration of breastfeeding.

A pooled analysis of breast-feeding and breast cancer risk by hormone receptor status in parous Hispanic women.

TLDR
It is suggested that breast-feeding is associated with reduced risk of both HR+ and ER-PR- breast cancer among Hispanic women, as reported for other populations, and may attenuate the increased risk in women with a first pregnancy at older ages.

Breastfeeding and Risk of Breast Cancer: Case-Control Study

TLDR
The aim of this study was to investigate a possible association of breast cancer occurrence in women with their breastfeeding experience, and it is one of the few in which breastfeeding was found to be a risk factor for breast cancer.

Pregnancies, breast-feeding, and breast cancer risk in the International BRCA1/2 Carrier Cohort Study (IBCCS).

TLDR
BRCA1 and BRCA2 mutation carriers older than 40 years show a similar reduction in breast cancer risk with increasing parity as non-carriers.
...

References

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Breastfeeding and breast cancer risk by age 50 among women in Germany

TLDR
The study results support a protective role of prolonged breastfeeding against the development of breast cancer in predominantly premenopausal women in Germany.

Breastfeeding experience and breast cancer risk among postmenopausal women.

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TLDR
There is some evidence that the protective effect of breastfeeding persists into the postmenopausal years, and the association was attenuated after accounting for lifetime duration of breastfeeding.

Breastfeeding history, pregnancy experience and risk of breast cancer.

TLDR
A protective role of breastfeeding and an adverse role of nausea or vomiting during pregnancy in the development of premenopausal breast cancer, especially in the years immediately following pregnancy are supported.

Breast cancer and lactation history in Mexican women.

TLDR
The declining trend in fertility and lactation among Mexican women could lead to a major epidemic of breast cancer such as that observed in Western countries.

Breastfeeding and reduced risk of breast cancer in an Icelandic cohort study.

TLDR
This is the first cohort study to indicate a negative association between breastfeeding and breast cancer, and 9,729 parous controls individually matched on birth year, vital status at case diagnosis, and age when giving information on several potential risk factors for breast cancer.
...