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We constructed Cox models of individual exposures by comparing case subtypes to the entire non\u2010case group and assessed <jats:italic>p\u2010<\/jats:italic>heterogeneity in case\u2013case comparisons using serous as the reference category. Substantial risk differences between histologic subtypes were observed for menopausal hormone therapy (MHT) use, oral contraceptive (OC) use, parity and body mass index (<jats:italic>p\u2010<\/jats:italic>heterogeneity = 0.01, 0.03, 0.05, 0.03, respectively). MHT users were at increased risk for all histologic subtypes except for mucinous carcinomas, where risk was reduced (relative risk (RR) = 0.37; 95% confidence interval (CI): 0.18, 0.80). OC users were only at significantly decreased risk for serous cancers (RR = 0.69; 95% CI: 0.55, 0.85). Although parity was inversely associated with risk of all subtypes, the RRs ranged from 0.28 (clear cell) to 0.83 (serous). Obesity was a significant risk factor only for endometrioid cancers (RR = 1.64; 95% CI: 1.00, 2.70). Our findings support a link between etiological factors and histological heterogeneity in ovarian carcinoma.<\/jats:p>","DOI":"10.1002\/ijc.26469","type":"journal-article","created":{"date-parts":[[2011,9,29]],"date-time":"2011-09-29T17:27:49Z","timestamp":1317317269000},"page":"938-948","source":"Crossref","is-referenced-by-count":99,"title":["Ovarian cancer risk factors by histologic subtypes in the NIH\u2010AARP diet and health study"],"prefix":"10.1002","volume":"131","author":[{"given":"Hannah P.","family":"Yang","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Britton","family":"Trabert","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Megan A.","family":"Murphy","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark 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