Table 4.
Relative risk of all second cancers among patients given radiotherapy, by age-at-treatment
| Age-at-treatment (years) | RR a unadjusted for chemotherapy and hormonal therapy (95% CI b ) | RR a adjusted for chemotherapy and hormonal therapy (95% CI b ) | Cases/women with radiotherapy | Cases/women with no radiotherapy |
|---|---|---|---|---|
| <50 | 0.96 (0.60, 1.56) | 0.87 (0.54, 1.43) | 32/584 (5.5%) | 45/632 (7.1%) |
| 50 to 64 | 1.43 (0.88, 2.31) | 1.35 (0.83, 2.20) | 35/549 (6.4%) | 37/687 (5.4%) |
| 65+ | 1.83 (0.65, 5.14) | 1.69 (0.60, 4.76) | 6/134 (4.5%) | 12/494 (2.4%) |
| All | 1.22 (0.88, 1.69) | 1.14 (0.82, 1.58) | 73/1,267 (5.8%) | 94/1,813 (5.2%) |
a Relative risk is calculated based on a follow-up of five or more years.
b Confidence interval.