Breastfeeding and breast cancer risk.
Article Type: Brief article
Subject: Cancer (Prevention)
Cancer (Research)
Breast feeding (Health aspects)
Breast cancer (Risk factors)
Breast cancer (Prevention)
Author: Thompson, June
Pub Date: 10/01/2009
Publication: Name: Community Practitioner Publisher: Ten Alps Publishing Audience: Academic Format: Magazine/Journal Subject: Health; Health care industry Copyright: COPYRIGHT 2009 Ten Alps Publishing ISSN: 1462-2815
Issue: Date: Oct, 2009 Source Volume: 82 Source Issue: 10
Topic: Event Code: 310 Science & research
Geographic: Geographic Scope: United Kingdom Geographic Code: 4EUUK United Kingdom
Accession Number: 209163261
Full Text: Women with a family history of breast cancer and who have ever breastfed reduce their risk of premenopausal breast cancer by nearly 60%, a study has found. Some studies have suggested that breastfeeding reduces breast cancer risk, but evidence has been mixed. To assess the relationship between breastfeeding intensity and incidence of premenopausal breast cancer, researchers collected detailed information on lactation history, supplemental feeding and lactation amenorrhea among 60 075 participants in the Nurses' Health Study II from 1997 to 2005 who had given birth. Breastfeeding history was assessed in detail on the 1997 questionnaire, and on each follow up women were asked to report whether they had been diagnosed with breast cancer. A total of 608 cases of premenopausal breast cancer were diagnosed at an average age of 46.2 years. Women who had a first-degree relative with breast cancer had a lower risk of developing the disease if they had ever breastfed than if they had never breastfed. There was no association between breastfeeding and breast cancer among women without a family history. These data suggest women with a family history of breast cancer should be encouraged to breastfeed, say the authors.

Stuebe A, Willett W, Xue F, Michels, K. Lactation and incidence of premenopausal breast cancer: a longitudinal study. Archives of Internal Medicine, 2009; 169(15): 1364-71.
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