LEP and breast cancer: Notably, Black women with or without BC exhibited significantly higher leptin levels (median [IQR], 55.3 [40.3-66.2] ng/mL and 29.1 [21.1-46.5] ng/mL, respectively) than White women (median [IQR], 33.4 [18.9-47.7] ng/mL and 16.5 [10.0-22.9] ng/mL, respectively) (P < .001) (Figure 3B; eTable 3 in Supplement 1).