text_1: The risk of breast cancer among parous women increases with placental weight of pregnancies, and this association is strongest for premenopausal breast cancer.
text_2: A high birth weight (> or =4000 g) in 2 successive births was associated with an increased risk of breast cancer before but not after adjusting for placental weight and other covariates (adjusted hazard ratio, 1.10; 95% CI, 0.76-1.59).