The aim of this present study was to examine duration of breastfeeding in relation to the risk of different subgroups of breast cancer. A prospective cohort, The Malm? Diet and Cancer study, including 14092 parous women, were followed during a mean of 10.2?years and a total of 424 incident breast cancers were diagnosed.
Tumours were classified regarding invasiveness, tumour size, axillary lymph node status, Nottingham grade, tumour proliferation (Ki67), HER2, cyclin D1 and p27, WHO histological type and hormone receptor status. Duration of breastfeeding was measured using total time of breastfeeding, categorized in quartiles using the lowest as the reference group (
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Cites: Int J Cancer. 2007 May 15;120(10):2202-717278089
Cites: Breast Cancer Res. 2007;9(1):R1117254341
Cites: Cancer. 2008 Oct 1;113(7):1521-618726992
Cites: J Womens Health (Larchmt). 2008 Dec;17(10):1635-4519049358
Cites: Int J Cancer. 2009 Jan 15;124(2):402-1118798278