From: Body mass index, mammographic density, and breast cancer risk by estrogen receptor subtype
 | Normal/underweight BMI < 25 kg/m2 | Overweight/obese BMI ≥ 25 kg/m2 | |||||||
---|---|---|---|---|---|---|---|---|---|
Cases | Controls | OR (95% CI) | Cases | Controls | BMI association (unadjusted for density) OR (95% CI)a | P het c | BMI association (adjusted for density) OR (95% CI)b | P het c | |
Premenopausal | Â | Â | Â | Â | Â | Â | 0.07 | Â | 0.04 |
 ER-positive cancer | 325 | 979 | 1.00 (ref) | 180 | 528 | 1.06 (0.86–1.32) |  | 1.53 (1.21–1.94) |  |
 ER-negative cancer | 58 | 979 | 1.00 (ref) | 47 | 528 | 1.58 (1.05–2.38) |  | 2.51 (1.61–3.93) |  |
Postmenopausal HT user | Â | Â | Â | Â | Â | Â | 0.95 | Â | 0.75 |
 ER-positive cancer | 240 | 678 | 1.00 (ref) | 171 | 446 | 1.16 (0.92–1.47) |  | 1.58 (1.23–2.04) |  |
 ER-negative cancer | 41 | 678 | 1.00 (ref) | 27 | 446 | 1.14 (0.69–1.90) |  | 1.44 (0.84–2.48) |  |
Postmenopausal HT non-user | Â | Â | Â | Â | Â | Â | 0.24 | Â | 0.13 |
 ER-positive cancer | 228 | 1029 | 1.00 (ref) | 394 | 1060 | 1.69 (1.40–2.04) |  | 2.28 (1.86–2.81) |  |
 ER-negative cancer | 51 | 1029 | 1.00 (ref) | 61 | 1060 | 1.32 (0.89–1.94) |  | 1.62 (1.06–2.47) |  |