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Seven hundred eighty\u2010six incident invasive premenopausal breast cancers and 1,522 incident invasive postmenopausal breast cancers occurred during a mean follow\u2010up of 9.7 years. Weight and BMI were updated every 24 months and considered as time\u2010dependent variables. Data were analyzed using multivariate Cox proportional hazards models. Trend RRs of premenopausal breast cancer were 0.97 (0.92\u20131.01) for a 5 kg increase in weight and 0.96 (0.91\u20131.01) for a 2 kg\/m<jats:sup>2<\/jats:sup> increase in BMI, adjusted for other known risk factors. Opposite trend RRs were found after menopause: 1.05 (1.02\u20131.08) for weight and 1.06 (1.02\u20131.09) for BMI, respectively, for similar increases. Women with a BMI of over 30 kg\/m<jats:sup>2<\/jats:sup> had a RR of premenopausal breast cancer of 0.66 (0.40\u20131.10) compared to those with a BMI of between 18.5 and 25 kg\/m<jats:sup>2<\/jats:sup>. Postmenopausal women with a BMI of over 30 kg\/m<jats:sup>2<\/jats:sup> had a RR of breast cancer of 1.23 (1.00\u20131.59). The increase in risk of postmenopausal breast cancer with increased weight or BMI was similar whatever the HRT used, although the point estimates were higher in HRT users. We strongly recommend to use anthropometric measurements updated during follow\u2010up to assess the effect of weight, BMI on breast cancer risk. \u00a9 2004 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/ijc.20213","type":"journal-article","created":{"date-parts":[[2004,6,7]],"date-time":"2004-06-07T19:08:42Z","timestamp":1086635322000},"page":"264-269","source":"Crossref","is-referenced-by-count":33,"title":["Anthropometry, breast cancer and menopausal status: Use of repeated measurements over 10 years of follow\u2010up\u2014results of the French E3N women's cohort study"],"prefix":"10.1002","volume":"111","author":[{"given":"Bertrand","family":"Tehard","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Petra H.","family":"Lahmann","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Elio","family":"Riboli","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fran\u00e7oise","family":"Clavel\u2010Chapelon","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2004,4,12]]},"reference":[{"key":"e_1_2_7_2_2","first-page":"252","author":"World Cancer Research Fund\/American Institute for Cancer Research","year":"1997","journal-title":"Food, Nutrition and the Prevention of Cancer: a Global Perspective."},{"key":"e_1_2_7_3_2","doi-asserted-by":"publisher","DOI":"10.1097\/00008469-200102000-00003"},{"key":"e_1_2_7_4_2","series-title":"IARC Handbooks of Cancer Prevention","year":"2002"},{"key":"e_1_2_7_5_2","doi-asserted-by":"publisher","DOI":"10.1093\/aje\/152.6.514"},{"key":"e_1_2_7_6_2","doi-asserted-by":"publisher","DOI":"10.1002\/ijc.1487"},{"key":"e_1_2_7_7_2","doi-asserted-by":"publisher","DOI":"10.1002\/ijc.10799"},{"key":"e_1_2_7_8_2","doi-asserted-by":"publisher","DOI":"10.1038\/sj.bjc.6600124"},{"key":"e_1_2_7_9_2","doi-asserted-by":"publisher","DOI":"10.1079\/PHN2002394"},{"key":"e_1_2_7_10_2","unstructured":"WHO Expert Committee.Physical status: the use and interpretation of anthropometry. 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