Spectrum and frequencies of BRCA1/2 mutations in Bulgarian high risk breast cancer patients View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2015-12

AUTHORS

Rumyana Ivanova Dodova, Atanaska Velichkova Mitkova, Daniela Rosenova Dacheva, Lina Basam Hadjo, Alexandrina Ivanova Vlahova, Margarita Stoyanova Taushanova - Hadjieva, Spartak Stoyanov Valev, Marija Mitko Caulevska, Stanislava Dimitrova Popova, Ivan Emilov Popov, Tihomir Iliichev Dikov, Theophil Angelov Sedloev, Atanas Stefanov Ionkov, Konstanta Velinova Timcheva, Svetlana Liubomirova Christova, Ivo Marinov Kremensky, Vanio Ivanov Mitev, Radka Petrova Kaneva

ABSTRACT

BACKGROUND: About 3885 women are diagnosed with breast cancer and 1285 die from the disease each year in Bulgaria. However no genetic testing to identify the mutations in high-risk families has been provided so far. METHODS: We evaluated 200 Bulgarian women with primary invasive breast cancer and with personal/ family history of breast cancer for the presence of unequivocally damaging germline mutations in BRCA1/2 using Sanger sequencing. RESULTS: Of the 200 patients, 39 (19.5 %) carried a disease predisposing mutation, including 28 (14 %) with a BRCA1 mutation and 11 (5.5 %) with a BRCA2 mutation. At BRCA1, 6 different mutations were identified, including 2 frameshifts, 1 nonsense and 1 missense that had been previously reported (c.5030_5033delCTAA, c.5263_5264insC, c.4603G > T, c.181 T > G), and 2 frameshifts, which were novel to this study (c.464delA, c.5397_5403delCCCTTGG). At BRCA2, 7 different frameshift mutations were identified, including 5 previously reported (5851_5854delAGTT, c.5946delT, c.5718_5719delCT, c.7910_7914delCCTTT,c.9098_9099insA) and 2 novel (c.8532_8533delAA, c.9682delA). A BRCA1 mutation was found in 18.4 % of women diagnosed with breast cancer at/or under the age of 40 compared to 11.2 % of women diagnosed at a later age; a BRCA2 mutation was found in 4 % of women diagnosed at/or under the age of 40 compared to 6.5 % of women diagnosed at a later age. A mutation was present in 26.8 % patients with a positive family history and in 14.4 % of women with a negative family history. The most prevalent mutation observed in 22 patients (11 %) was BRCA1 c.5263_5264insC, a known Slavic mutation with founder effect in Eastern European and AJ communities. Other recurrent mutations were BRCA2 c.9098-9099insA (2 %), BRCA1 c.181T > G (1 %) and BRCA2 c.5851_5854delAGTT (1 %). Notably, BRCA1 c.5263_5264insC represented 56 % of all mutations identified in this series. Of the 22 patients with BRCA1 c.5263_5264insC, 9 were diagnosed with early onset breast cancer, 11 with TNBCs, 4 with bilateral breast cancer, and 6 with both breast and ovarian cancer. CONCLUSIONS: This is the first comprehensive study of the BRCA1/2 mutation spectrum in Bulgaria and will assist the establishment of efficient protocols for genetic testing and individualized risk assessment for Bulgarian breast/ovarian cancer patients and healthy individuals at a high-risk. More... »

PAGES

523

References to SciGraph publications

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  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1186/s12885-015-1516-2

    DOI

    http://dx.doi.org/10.1186/s12885-015-1516-2

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1022893620

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/26183948


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