[BRCA1 and BRCA2 mutations in patients with familial breast cancer].

BACKGROUND AND
OBJECTIVE: Familial breast (BC) and ovarian cancer (OC) has been associated with germ-line mutations in the cancer susceptibility genes BRCA1 and BRCA2. The mutational spectra vary depending on the study populations and the criteria applied for patient selection. The present study reports the mutations found in 48 families of the Valencian Community studied in the University Hospital La Fe of Valencia (Spain). PATIENTS AND
METHOD: We analysed the BRCA1 and BRCA2 genes of 48 families (55 patients) with a family history of BC an/or OC. The method consists of DNA extraction, followed by a polymerase chain reaction, mutational analysis by heteroduplex formation in conformation-sensitive-gel electrophoresis and sequencing of the heteroduplex detected.
RESULTS: We report eight different deleterious mutations, four in BRCA1 and four in BRCA2 and four unclassified variants (UV). We also identified the presence of the BRCA1 3889_3890delG mutation for the first time in the Spanish population. In BRCA2, we report two mutations not described in the breast cancer information care, the 5025delT which is completely new and the 9206_9219del14, which has already been described in Spanish population. We also describe for the first time the presence of UV 8038C>T in this gene.
CONCLUSIONS: The mutational spectra and the presence of new mutations in the limited number of patients give support to the relevance of the study population in the mutational spectra.