PGR and breast cancer: In postmenopausal women with oestrogen-receptor–negative breast cancer: Glycemic load (highest vs. lowest quintile): HR 1.36 (1.02–1.82) P trend = 0.010 Carbohydate intake (highest vs. lowest quintile): HR 1.41 (1.05–1.89) P trend = 0.009 Further stratification by progesterone receptor status showed slightly stronger associations with ER−/PR− breast cancer (highest vs. lowest quintile): HR 1.48 (1.07–2.05) P trend = 0.010 for glycemic load, and HR 1.62 (1.15–2.30) P trend = 0.005 for carbohydrates.