Table 9.

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

Age-at-risk	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	2.12 (0.30, 15.07)	1.64 (0.22, 12.10)	3/569 (0.5%)	2/607 (0.3%)
50 to 64	1.67 (0.71, 3.91)	1.46 (0.62, 3.43)	11/926 (1.2%)	11/1,154 (1.0%)
65+	2.07 (0.98, 4.35)**	2.04 (0.96, 4.35)	15/482 (3.1%)	16/1,022 (1.6%)

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

** P = 0.055.

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

^b Confidence interval.