Table 3 Relative risk of all second cancers among patients given radiotherapy, by period of follow-up
From: Second malignancies in breast cancer patients following radiotherapy: a study in Florence, Italy
Follow-up period (years) | RRaunadjusted for chemotherapy and hormonal therapy (95% CIb) | RRaadjusted for chemotherapy and hormonal therapy (95% CIb) | Case/women with radiotherapy | Cases/women with no radiotherapy |
|---|---|---|---|---|
2 to 4 | 0.52 (0.33, 0.82)* | 0.44 (0.28, 0.70)* | 37/2,339 (1.6%) | 53/2,377 (2.2%) |
5 to 9 | 1.20 (0.79, 1.82) | 1.08 (0.71, 1.65) | 43/1,267 (3.4%) | 56/1,813 (3.1%) |
10 to 14 | 1.40 (0.75, 2.64) | 1.34 (0.71, 2.52) | 16/390 (4.1%) | 28/972 (2.9%) |
15+ | 0.99 (0.41, 2.41) | 1.13 (0.46, 2.77) | 14/230 (6.0%) | 10/307 (3.3%) |