Three deleterious BRCA germline mutations have been observed in about 15% families and in about 3% non-familial breast cancer patients from North Sardinia (BRCA2 mutations were the most prevalent BRCA sequence variations and a single variant, BRCA2-8765delAG, was the most recurrent mutation with a founder effect in our population) [23-25]. This evidence concerns the gene BRCA2 and breast cancer.