ESR1 and breast cancer: However, Order.Bifidobacteriales (Odds Ratio: 0.9672, 95% CI: 0.9361–0.9994) and Genus.Paraprevotella (Odds Ratio: 0.8524, 95% CI: 0.7485–0.9707) were related to a reduced risk of ER (+) and ER (−) breast cancer, respectively (p < 0.05; Figure 2).