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000142254 0247_ $$2doi$$a10.7326/M18-1323
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000142254 0247_ $$2ISSN$$a0003-4819
000142254 0247_ $$2ISSN$$a1040-6050
000142254 0247_ $$2ISSN$$a1539-3704
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000142254 037__ $$aDKFZ-2019-00057
000142254 041__ $$aeng
000142254 082__ $$a610
000142254 1001_ $$aNichols, Hazel B$$b0
000142254 245__ $$aBreast Cancer Risk After Recent Childbirth: A Pooled Analysis of 15 Prospective Studies.
000142254 260__ $$aLos Angeles, Calif.$$bCurAnt Communications$$c2019
000142254 3367_ $$2DRIVER$$aarticle
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000142254 500__ $$aAnnals of Internal Medicine eISSN: 1539-3704 ISSN: 0003-4819
000142254 520__ $$aParity is widely recognized as protective for breast cancer, but breast cancer risk may be increased shortly after childbirth. Whether this risk varies with breastfeeding, family history of breast cancer, or specific tumor subtype has rarely been evaluated.To characterize breast cancer risk in relation to recent childbirth.Pooled analysis of individual-level data from 15 prospective cohort studies.The international Premenopausal Breast Cancer Collaborative Group.Women younger than 55 years.During 9.6 million person-years of follow-up, 18 826 incident cases of breast cancer were diagnosed. Hazard ratios (HRs) and 95% CIs for breast cancer were calculated using Cox proportional hazards regression.Compared with nulliparous women, parous women had an HR for breast cancer that peaked about 5 years after birth (HR, 1.80 [95% CI, 1.63 to 1.99]) before decreasing to 0.77 (CI, 0.67 to 0.88) after 34 years. The association crossed over from positive to negative about 24 years after birth. The overall pattern was driven by estrogen receptor (ER)-positive breast cancer; no crossover was seen for ER-negative cancer. Increases in breast cancer risk after childbirth were pronounced when combined with a family history of breast cancer and were greater for women who were older at first birth or who had more births. Breastfeeding did not modify overall risk patterns.Breast cancer diagnoses during pregnancy were not uniformly distinguishable from early postpartum diagnoses. Data on human epidermal growth factor receptor 2 (HER2) oncogene overexpression were limited.Compared with nulliparous women, parous women have an increased risk for breast cancer for more than 20 years after childbirth. Health care providers should consider recent childbirth a risk factor for breast cancer in young women.The Avon Foundation, the National Institute of Environmental Health Sciences, Breast Cancer Now and the UK National Health Service, and the Institute of Cancer Research.
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000142254 7001_ $$aSchoemaker, Minouk J$$b1
000142254 7001_ $$aCai, Jianwen$$b2
000142254 7001_ $$aXu, Jiawei$$b3
000142254 7001_ $$aWright, Lauren B$$b4
000142254 7001_ $$aBrook, Mark N$$b5
000142254 7001_ $$aJones, Michael E$$b6
000142254 7001_ $$aAdami, Hans-Olov$$b7
000142254 7001_ $$aBaglietto, Laura$$b8
000142254 7001_ $$aBertrand, Kimberly A$$b9
000142254 7001_ $$aBlot, William J$$b10
000142254 7001_ $$aBoutron-Ruault, Marie-Christine$$b11
000142254 7001_ $$aDorronsoro, Miren$$b12
000142254 7001_ $$aDossus, Laure$$b13
000142254 7001_ $$aEliassen, A Heather$$b14
000142254 7001_ $$aGiles, Graham G$$b15
000142254 7001_ $$aGram, Inger T$$b16
000142254 7001_ $$aHankinson, Susan E$$b17
000142254 7001_ $$aHoffman-Bolton, Judy$$b18
000142254 7001_ $$0P:(DE-He78)4b2dc91c9d1ac33a1c0e0777d0c1697a$$aKaaks, Rudolf$$b19$$udkfz
000142254 7001_ $$aKey, Timothy J$$b20
000142254 7001_ $$aKitahara, Cari M$$b21
000142254 7001_ $$aLarsson, Susanna C$$b22
000142254 7001_ $$aLinet, Martha$$b23
000142254 7001_ $$aMerritt, Melissa A$$b24
000142254 7001_ $$aMilne, Roger L$$b25
000142254 7001_ $$aPala, Valeria$$b26
000142254 7001_ $$aPalmer, Julie R$$b27
000142254 7001_ $$aPeeters, Petra H$$b28
000142254 7001_ $$aRiboli, Elio$$b29
000142254 7001_ $$aSund, Malin$$b30
000142254 7001_ $$aTamimi, Rulla M$$b31
000142254 7001_ $$aTjønneland, Anne$$b32
000142254 7001_ $$aTrichopoulou, Antonia$$b33
000142254 7001_ $$aUrsin, Giske$$b34
000142254 7001_ $$aVatten, Lars$$b35
000142254 7001_ $$aVisvanathan, Kala$$b36
000142254 7001_ $$aWeiderpass, Elisabete$$b37
000142254 7001_ $$aWolk, Alicja$$b38
000142254 7001_ $$aZheng, Wei$$b39
000142254 7001_ $$aWeinberg, Clarice R$$b40
000142254 7001_ $$aSwerdlow, Anthony J$$b41
000142254 7001_ $$aSandler, Dale P$$b42
000142254 773__ $$0PERI:(DE-600)2060547-X$$a10.7326/M18-1323$$gVol. 170, no. 1, p. 22 -$$n1$$p22-30$$tAnnals of Internal Medicine$$v170$$x0003-4819$$y2019
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