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Purpose As obesity and type 2 diabetes (T2D) have been increasing worldwide, we investigated their association with breast cancer incidence in the Reykjavik Study. Methods During 1968–1996, approximately 10,000 women (mean age = 53 ± 9 years) completed questionnaires and donated blood samples. T2D status was classified according to self-report (n = 140) and glucose levels (n = 154) at cohort entry...