Description : For a general discussion of hereditary breast cancer, see 114480. Breast Cancer Linkage
Consortium data on 237 breast-ovarian cancer families showed that 52% were linked
to BRCA1 (113705) and 32% to BRCA2 (600185). Later studies indicated that the proportion
of breast cancer families attributable to these 2 genes may be smaller than initially
thought. In Finnish breast cancer families with 3 or more affected cases, a mutation
in the BRCA1 gene was seen in only 10% and in the;