Table 1. Incidence of interstitial pneumonitis (IP) among 35 823 Danish breast cancer patients by age and cancer stage, Denmark 1994–2004.
| Number of breast cancer patients (%) | Number of IP patients (%) | Incidence rate per 100 000 person-years (95% CI) | |
|---|---|---|---|
| IP unspecified | |||
| Overall | 35 823 (100%) | 28 (100%) | 17.3 (11.7–24.6) |
| Age groups (years) | |||
| <50 | 7119 (19.9%) | 6 (21.4%) | 16.4 (6.8–33.7) |
| 50–70 | 17 694 (49.4%) | 19 (67.9%) | 22.6 (14.0–34.5) |
| >70 | 11 010 (30.7%) | 3 (10.7%) | 7.3 (2.1–19.3) |
| Cancer stagea | |||
| Localised cancer, no metastasis | 13 746 (38.4%) | 2 (7.1%) | 6.9 (2.9–14.3) |
| Regional metastases | 16 841 (47.0%) | 18 (64.3%) | 30.4 (12.6–46.9) |
| Distant metastases | 1881 (5.2%) | 6 (21.4%) | 60.7 (12.1–194.6) |
| Unknown | 3355 (9.4%) | 2 (7.1%) | 14.8 (2.9–47.6) |
| IP radiation-induced | |||
| Overall | 35 823 (100%) | 26 (100%) | 16.0 (10.7–23.1) |
| Age groups (years) | |||
| <50 | 7119 (19.9%) | 6 (23.1%) | 16.4 (6.8–33.7) |
| 50–70 | 17 694 (49.4%) | 17 (65.4%) | 20.7 (12.2–31.6) |
| >70 | 11 010 (30.7%) | 3 (11.5%) | 7.3 (2.0–19.3) |
| Cancer stagea | |||
| Localised cancer, no metastasis | 13 746 (38.4%) | 2 (7.7%) | 4.6 (1.6–11.0) |
| Regional metastases | 16 841 (47.0%) | 18 (69.2%) | 60.7 (12.1–194.6) |
| Distant metastases | 1881 (5.2%) | 2 (7.7%) | 30.4 (18.6–46.9) |
| Unknown | 3355 (9.4%) | 2 (7.7%) | 14.8 (2.9–47.6) |
| IP drug-induced | |||
| Overall | 35 823 (100%) | 2 (100%) | 1.2 (0.25–3.9) |
| Age groups (years) | |||
| <50 | 7119 (19.9%) | 0 | — |
| 50–70 | 17 694 (49.4%) | 2 (100%) | 2.4 (0.5–7.6) |
| >70 | 11 010 (30.7%) | 0 | — |
| Cancer stagea | |||
| Localised cancer, no metastasis | 13 746 (38.4%) | 0 | — |
| Regional metastases | 16 841 (47.0%) | 0 | — |
| Distant metastases | 1881 (5.2%) | 2 (100%) | 2.3 (0.5–7.4) |
| Unknown | 3355 (9.4%) | 0 | — |
a
Cancer stage according to summary stage classification.