In a recent meta-analysis [38], a weak increased BC risk (about 6%) has been reported to be associated with high GI in post-menopausal, but not in pre-menopausal women; for post-menopausal BC, the association was slightly stronger for women with hormone receptor-negative (ER− and/or PR−) phenotype, but findings were not statistically significant. Here, PGR is linked to breast cancer.