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

Sérgio Tessaro, Jorge U. Béria, Elaine Tomasi, Cesar G. Victora

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16 Scopus citations


To investigate the relationship between breastfeeding and breast cancer in Southern Brazil, a case-control design was employed, with two age-matched control groups. A total of 250 cases of breast cancer were identified in women from 20 to 60 years of age, with 1,020 hospital and community controls. The main study variables were occurrence of breastfeeding and duration of breastfeeding. A multivariate conditional logistic regression analysis was employed. According to the results, breastfeeding did not have a protective effect against breast cancer. The odds ratio (OR) for women who breastfed was 0.9 (95% CI: 0.8-1.2) compared to women who did not breastfeed. For women who breastfed for six months or less, the OR was 1.0 (95% CI: 0.6-1.8). In pre-menopausal women who breastfed for more than 25 months, the OR was 0.95 (95% CI: 0.5-3.5), and in post-menopausal women OR was 1.27 (95% CI: 0.5-3.1), compared to women who had not breastfeed.

Original languageEnglish (US)
Pages (from-to)1593-1601
Number of pages9
JournalCadernos de saúde pública / Ministério da Saúde, Fundação Oswaldo Cruz, Escola Nacional de Saúde Pública.
Issue number6
StatePublished - Nov 2003
Externally publishedYes

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health


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