Abstract
The discovery of the BRCA1 gene involved in the development of human hereditary breast cancer led to extensive international efforts to identify the mutations leading to the disease. The new listing covers 127 mutations published in the indicated papers before 30 April 1996; 55% of the mutations are localized in exon 11, followed by exons 2 (5.5%), 5 and 16 (4.7% each).