Family history of breast tumor | Age at invasive breast cancer diagnosis in index woman (years) | ||||||||
---|---|---|---|---|---|---|---|---|---|
All ages | < 50 | ≥ 50 | |||||||
Obs | SIR | 95% CI | Obs | SIR | 95% CI | Obs | SIR | 95% CI | |
No family history of in situ or invasive | 102,177 | Reference | 31,693 | Reference | 70,484 | Reference | |||
1 FDR in situ | 575 | 1.5 | 1.4–1.7 | 126 | 1.6 | 1.3–1.9 | 449 | 1.5 | 1.4–1.7 |
1 FDR invasive | 11,990 | 1.7 | 1.7–1.8 | 2874 | 2.0 | 1.9–2.1 | 9116 | 1.7 | 1.6–1.7 |
1 SDR in situ | 132 | 1.2§ | 1.0–1.4 | 67 | 1.1 | 0.9–1.4 | 65 | 1.3 | 1.0–1.7 |
1 SDR invasive | 2309 | 1.3§ | 1.3–1.4 | 1478 | 1.3 | 1.3–1.4 | 831 | 1.3 | 1.2–1.4 |
1 SDR invasive + 1 SDR in situ | 44 | 2.4 | 1.7–3.2 | 32 | 2.4 | 1.6–3.4 | 12 | 2.3 | 1.2–4.1 |
2 SDRs invasive | 223 | 1.6 | 1.4–1.8 | 180 | 1.7 | 1.5–2.0 | 43 | 1.2 | 0.9–1.6 |
1 FDR in situ + 1 SDR invasive | 33 | 2.2 | 1.5–3.1 | 24 | 2.8 | 1.8–4.2 | 9 | 1.3 | 0.6–2.6 |
1 FDR invasive + 1 SDR invasive | 453 | 2.3 | 2.1–2.5 | 248 | 2.6 | 2.3–2.9 | 205 | 2.0 | 1.8–2.3 |
1 FDR invasive + 1 FDR in situ | 89 | 2.6 | 2.1–3.2 | 9 | 3.5 | 1.6–6.6 | 80 | 2.5 | 2.0–3.1 |
2 FDRs invasive | 689 | 2.7 | 2.5–2.9 | 86 | 4.6 | 3.7–5.7 | 603 | 2.6 | 2.4–2.8 |