Low prevalence of BRCA1 and BRCA2 mutations in the sporadic breast cancer of Spanish population.
Summary of "Low prevalence of BRCA1 and BRCA2 mutations in the sporadic breast cancer of Spanish population."
The true prevalence of BRCA1/BRCA2 (BRCAs) germline mutations in sporadic breast or ovarian cancer (SBC/SOC) in Caucasian population is not well established. The aim of the study is to establish the prevalence of BRCAs mutations in SBC to ponder its relevance in the programs of genetic counseling in cancer and to explore the genotype-phenotype relationship of these particular breast cancers. The study was performed in 495 SBC. We sought 46 BRCA1 and 53 BRCA2 pathogenic mutations reported in the Spanish population. We followed a high resolution melting method performed in the LightCycler 480 (Roche Diagnostics) for the screening of these Spanish mutations using 49 primer pairs. Eight different deleterious mutations, one of them novel, were detected in nine patients, five without family history of BC/OC, what yields a true prevalence of 1.05% for BRCAs mutations in SBC. Furthermore, we found 18 unknown variants. Larger tumour size (T > 1) and earlier presentation are the independent parameters associated with the presence of BRCAs pathogenic mutations in SBC (P < 0.01) and the BRCA1 mutations carriers develop steroid-receptors negative tumors. Our results indicate that the true prevalence of BRCAs germline deleterious mutations in SBC of Spaniards is low. However, this does not lessens its relevance since the presence of BRCAs mutations in SBC could represent circa 16% of total BRCAs mutations detected in BC. SBCs of BRCAs mutation carriers have phenotype more aggressiveness than SBC without BRCAs mutation.
Affiliation
Laboratory of Molecular Biology, Clinical Analysis Service, Escuela de Enfermería 7ª planta, Hospital Universitario La Fe, Avd. Campanar, 21, 46009, Valencia, Spain.
Journal Details
This article was published in the following journal.
Name: Familial cancer
ISSN: 1573-7292
Pages:
Links
- PubMed Source: http://www.ncbi.nlm.nih.gov/pubmed/21918853
- DOI: http://dx.doi.org/10.1007/s10689-011-9481-7
Medical and Biotech [MESH] Definitions
Brca1 Protein
The phosphoprotein encoded by the BRCA1 gene (GENE, BRCA1). In normal cells the BRCA1 protein is localized in the nucleus, whereas in the majority of breast cancer cell lines and in malignant pleural effusions from breast cancer patients, it is localized mainly in the cytoplasm. (Science 1995;270(5237):713,789-91)
Brca2 Protein
A large, nuclear protein, encoded by the BRCA2 gene (GENE, BRCA2). Mutations in this gene predispose humans to breast and ovarian cancer. The BRCA2 protein is an essential component of DNA repair pathways, suppressing the formation of gross chromosomal rearrangements. (from Genes Dev. 2000;14(11):1400-6)
Genes, Brca1
A tumor suppressor gene (GENES, TUMOR SUPPRESSOR) located on human chromosome 17 at locus 17q21. Mutations of this gene are associated with the formation of familial breast and ovarian cancer. It encodes a large, nuclear protein that is a component of DNA repair pathways.
Genes, Brca2
A tumor suppressor gene (GENES, TUMOR SUPPRESSOR) located on human chromosome 13 at locus 13q12.3. Mutations in this gene predispose humans to breast and ovarian cancer. It encodes a large, nuclear protein that is an essential component of DNA repair pathways, suppressing the formation of gross chromosomal rearrangements. (from Genes Dev 2000;14(11):1400-6)
Inflammatory Breast Neoplasms
Metastatic breast cancer characterized by EDEMA and ERYTHEMA of the affected breast due to LYMPHATIC METASTASIS and eventual obstruction of LYMPHATIC VESSELS by the cancer cells.
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