Table 2.
Absolute risk of contralateral breast cancer according to years since first cancer diagnosis and absolute risk of a first breast cancer at 2 ages in the general population without breast cancer – SEER data (1973–2006)
| Age at diagnosis and type of first breast cancer | Absolute risk of contralateral breast cancer according to years since first cancer diagnosis | Absolute risk of contralateral IBC according to years since first cancer diagnosis | Absolute risk of contralateral non-IBC according to years since first cancer | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2 yrs | 5 yrs | 10 yrs | 15 yrs | 20 yrs | 2 yrs | 5 yrs | 10 yrs | 15 yrs | 20 yrs | 2 yrs | 5 yrs | 10 yrs | 15 yrs | 20 yrs | |
| Age <50 yrs | |||||||||||||||
| IBC | 4.9% | 6.0% | 7.1% | 7.3% | 7.7% | 1.4% | 1.6% | 1.8% | 1.8% | 1.8% | 3.5% | 4.6% | 5.3% | 5.5% | 5.9% |
| Non-IBC(reg/dist) | 1.1% | 2.2% | 3.7% | 4.9% | 6.1% | 0.1% | 0.1% | 0.2% | 0.2% | 0.2% | 1.1% | 2.1% | 3.5% | 4.8% | 5.9% |
| Age ≥ 50 yrs | |||||||||||||||
| IBC | 2.7% | 3.7% | 4.7% | 5.3% | 5.5% | 0.9% | 1.1% | 1.2% | 1.2% | 1.2% | 1.8% | 2.9% | 3.6% | 4.3% | 4.3% |
| Non-IBC (reg/dist) | 1.0% | 2.0% | 3.2% | 4.1% | 4.6% | 0.0% | 0.1% | 0.1% | 0.1% | 0.1% | 1.0% | 1.9% | 3.1% | 4.0% | 4.5% |
| General population without breast cancer | Absolute risk of 1st breast cancer according to years since specified age | Absolute risk of 1st IBC according to years since specified age | Absolute risk of 1st non-IBC according to years since specified age | ||||||||||||
| 5 yrs | 10 yrs | 15 yrs | 20 yrs | 5 yrs | 10 yrs | 15 yrs | 20 yrs | ||||||||
| 45-year old | 0.9% | 2.1% | 3.6% | 5.2% | 0.0% | 0.0% | 0.1% | 0.1% | 0.9% | 2.1% | 3.5% | 5.1% | |||
| 65-year old | 2.0% | 4.1% | 5.9% | 7.3% | 0.0% | 0.0% | 0.1% | 0.1% | 2.0% | 4.0% | 5.8% | 7.2% | |||