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Table 10 Relative risk of all second cancers among patients given chemotherapy only, by age-at-treatment

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

Age-at-treatment (years) Relative Riska(95% CIb) P-value Cases/women with chemotherapy Cases/women with no chemotherapy
<50 0.37 (0.15, 0.91) 0.03 6/196 (3.1%) 34/367 (9.3%)
50 to 64 0.59 (0.17, 2.07) 0.4 3/67 (4.5%) 26/426 (6.1%)
65+ 0.00 >0.5 0/11 (0.0%) 10/333 (3.0%)
All 0.42 (0.20, 0.88) 0.02 9/274 (3.3%) 70/1,126 (6.2%)
  1. a Relative risk is calculated based on a follow-up of five or more years.
  2. b Confidence interval.