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Characterization of 2 novel and 2 recurring BRCA1 germline mutations in breast and/or ovarian carcinoma patients from the area of Naples.

We have analyzed 18 families with high incidence of breast cancer or breast and ovarian cancer for the presence of BRCA1 mutations. We identified 4 mutations in the BRCA1 gene in 4 unrelated probands who belong to families with at least 1 case of breast and 1 case of ovarian cancer. Two of the mutations reported in this study are novel (GAA(1172)-->TAA in family Naples 14, GAA(1765)-->TAA in family Naples 20) whereas the others are already present in the Breast Cancer Information Core Electronic Database (http://nchgr.nih.gov/ Intramural research/Lab transfer/Bic/) (5382insC in family Naples 18 and 2080delA in family Naples 19). Conversely, no mutation in the BRCA1 gene was detected in 14 families characterized by 2 or more cases of breast cancer only, even if bilateral and with early-onset. These results indicate that germline mutations in the BRCA1 gene highly predispose for a cancer syndrome that involves the presence of both breast and ovarian cancer.