PGR and breast cancer: In stratified analyses by ER/PR status (Table 3), the inverse associations between total polyphenols and phenolic acids with risk of BC remained significant and became stronger for the ER+ and PR+ BC type (HR 0.69; 95% CI: 0.51, 0.94; P-trend = 0.003 for total polyphenols; HR 0.70; 95% CI: 0.53, 0.95; P-trend = 0.005 for phenolic acids) comparing the highest to the lowest quintile.