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Table 5 Relative risk of all second cancers among patients given radiotherapy, by age-at-risk

From: Second malignancies in breast cancer patients following radiotherapy: a study in Florence, Italy

Age-at-risk (years) RRaunadjusted for chemotherapy and hormonal therapy (95% CIb) RRaadjusted for chemotherapy and hormonal therapy (95% CIb) Cases/women with radiotherapy Cases/women with no radiotherapy
<50 0.84 (0.37, 2.02) 0.70 (0.29, 1.65) 11/569 (1.9%) 12/607 (2.0%)
50 to 64 1.14 (0.69, 1.87) 1.02 (0.62, 1.68) 28/926 (3.0%) 41/1,154 (3.6%)
65+ 1.69 (1.05, 2.73)* 1.65 (1.02, 2.68)* 34/482 (7.1%) 41/1,022 (4.0%)
  1. * P < 0.05.
  2. a Relative risk is calculated based on a follow-up of five or more years.
  3. b Confidence interval.