From: Reproductive profiles and risk of breast cancer subtypes: a multi-center case-only study
 | Age at BC diagnosis | Odds ratio (95% CI) | P value | P value interaction parity × age |
---|---|---|---|---|
Luminal A-like | All ages | 1.00 (Ref.) | Â | Â |
Luminal B-like | All ages | 0.90 (0.77–1.05) | 0.18 |  |
Luminal HER2-like | All ages | 1.04 (0.88–1.24) | 0.62 |  |
HER2-like | All ages | 1.04 (0.83–1.29) | 0.73 |  |
TNBC | All ages | 1.38 (1.16–1.65) | 0.0004 |  |
Luminal A-like | At 35Â years | 1.00 (Ref.) | Â | Â |
At 55Â years | 1.00 (Ref.) | Â | Â | |
At 75Â years | 1.00 (Ref.) | Â | Â | |
Luminal B-like | At 35 years | 0.95 (0.64–1.43) | 0.82 |  |
At 55 years | 0.91 (0.65–1.26) | 0.55 |  | |
At 75 years | 0.89 (0.64–1.24) | 0.48 | 0.99 | |
Luminal HER2-like | At 35 years | 1.48 (1.01–2.16) | 0.046 |  |
At 55 years | 1.35 (0.92–1.99) | 0.13 |  | |
At 75 years | 0.72 (0.45–1.14) | 0.16 | 0.037 | |
HER2-like | At 35 years | 1.38 (0.86–2.20) | 0.18 |  |
At 55 years | 1.56 (0.98–2.47) | 0.06 |  | |
At 75 years | 0.59 (0.33–1.05) | 0.07 | 0.030 | |
TNBC | At 35 years | 1.40 (0.98–2.00) | 0.06 |  |
At 55 years | 1.80 (1.24–2.63) | 0.002 |  | |
At 75 years | 1.67 1.01–2.76) | 0.046 | 0.076 |