Table 1

Age at diagnosis of breast cancer by mutation

Mutation		Age at diagnosis of breast cancer		Total
Mutation		<40	41–50	Total		51–60	61–80
185delAG	5	7	1	0	13
5382insC	3	0	0	0	3
6174delT	3	4	2	2	11

All carriers	11	11	3	2	27
Non-carriers	21	41	42	35	144
Relative risk (carriervnon-carrier)	2.79	1.28	0.38	0.30