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Oral contraceptive use before 18 years of age was positively associated with disease risk among African American women only. CONCLUSIONS: Pregnancy during adolescence does not appear to influence breast cancer risk, but breast-feeding may. A possible increased breast cancer risk among African American women who used oral contraceptives as adolescents warrants further study. <\/jats:p>","DOI":"10.2105\/ajph.89.8.1244","type":"journal-article","created":{"date-parts":[[2008,11,29]],"date-time":"2008-11-29T13:33:29Z","timestamp":1227965609000},"page":"1244-1247","source":"Crossref","is-referenced-by-count":28,"title":["Adolescent reproductive events and subsequent breast cancer risk."],"prefix":"10.2105","volume":"89","author":[{"given":"P M","family":"Marcus","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D D","family":"Baird","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R C","family":"Millikan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"P G","family":"Moorman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"B","family":"Qaqish","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"B","family":"Newman","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"844","reference":[{"key":"p_1","doi-asserted-by":"publisher","DOI":"10.1093\/oxfordjournals.epirev.a036112"},{"key":"p_2","doi-asserted-by":"publisher","DOI":"10.1093\/oxfordjournals.epirev.a036102"},{"key":"p_3","unstructured":"Styne DM. 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