Table 8.

Relative risk of other second cancers* among patients given radiation therapy, by age-at- treatment

Age-at-treatment	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	1.54 (0.60, 3.93)	1.36 (0.53, 3.51)	9/584 (1.5%)	10/632 (1.6%)
50 to 64	2.44 (1.12, 5.30)**	2.36 (1.08, 5.14)**	18/549 (3.3%)	11/687 (1.6%)
65+	0.92 (0.18, 4.66)	0.82 (0.16, 4.13)	2/134 (1.5%)	8/494 (1.6%)

* Other second cancers are all second cancers other than contralateral breast cancer and leukaemia.

** P <0.05.

^a Relative risk is calculated based on a follow-up of five or more years.

^b Confidence interval.