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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%)
  1. * P <0.05.
  2. a Relative risk.
  3. b Confidence interval.