Table 2

Distribution of the identified BRCA gene mutations according to family characteristics

	No of families	No of mutations BRCA1 or 2	% of families mutation found
All families	42	14	33
Ovarian cancer
Present in family	14	9	64
Not present in family	28	5	18
Breast and ovarian cancer^2-150
In a single person	3	3	100
In separate people	8	5	63
Bilateral breast cancer^2-151
Present in family	7	4	57
Not present in family	32	9	28

↵2-150 Only families with breast and ovarian cancer cases are taken into account.
↵2-151 Only families with breast cancer cases are taken into account.