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We conducted a retrospective study at a University Hospital in Granada (Spain) by consulting the medical records of 524 women aged 19 to 91\u2009years, all of them diagnosed and treated for breast cancer from 2011 to 2019. Our findings indicated that in non-morbidly obese females who were also non-smokers, a maternal lactation period of more than 3\u2009months ( p\u2009=\u2009.013) and the absence of family antecedents of cancer ( p\u2009=\u2009.025) were statistically significant factors that led to a more advanced age at breast cancer diagnosis. Thus, maternal lactation seems to have a potential protective effect on breast cancer.<\/jats:p>","DOI":"10.1177\/10547738211069725","type":"journal-article","created":{"date-parts":[[2022,1,25]],"date-time":"2022-01-25T06:59:23Z","timestamp":1643093963000},"page":"901-908","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":3,"title":["Short Breastfeeding Duration is Associated With Premature Onset of Female Breast Cancer"],"prefix":"10.1177","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1298-8349","authenticated-orcid":false,"given":"\u00c1ngel","family":"Fern\u00e1ndez-Aparicio","sequence":"first","affiliation":[{"name":"University of Granada, Andaluc\u00eda, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jacqueline","family":"Schmidt-RioValle","sequence":"additional","affiliation":[{"name":"University of Granada, Andaluc\u00eda, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pedro A.","family":"Garc\u00eda","sequence":"additional","affiliation":[{"name":"University of Granada, Andaluc\u00eda, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Emilio","family":"Gonz\u00e1lez-Jim\u00e9nez","sequence":"additional","affiliation":[{"name":"University of Granada, Andaluc\u00eda, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2022,1,25]]},"reference":[{"key":"bibr1-10547738211069725","doi-asserted-by":"publisher","DOI":"10.1186\/s12889-019-7942-3"},{"key":"bibr2-10547738211069725","doi-asserted-by":"publisher","DOI":"10.1155\/2013\/906495"},{"key":"bibr3-10547738211069725","unstructured":"American Cancer Society. 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