CYP27A1 and breast cancer: In the BC-blood study, where preoperative weight, height, and waist and hip circumferences were measured, there were no statistically significant associations between high CYP27A1 expression and body mass index ≥ 25 kg/m2 or waist-to-hip ratio > 0.85 (both P > 0.05, Supplementary Table 2).