High frequency and allele-specific differences of BRCA1 founder mutations in breast cancer and ovarian cancer patients from Belarus

被引:39
作者
Bogdanova, N. V. [3 ,4 ]
Antonenkova, N. N. [4 ]
Rogov, Y. I. [5 ]
Karstens, J. H. [3 ]
Hillemanns, P.
Doerk, T. [1 ,2 ]
机构
[1] Hannover Med Sch, Gynaecol Res Unit OE 6411, Clin Obstet, D-30625 Hannover, Germany
[2] Hannover Med Sch, Gynaecol Res Unit OE 6411, Clin Gynaecol, D-30625 Hannover, Germany
[3] Hannover Med Sch, Clin Radiat Oncol, D-30625 Hannover, Germany
[4] Byelorussian Inst Oncol & Med Radiol Aleksandrov, Minsk, BELARUS
[5] Byelorussian Med Acad Postdiploma Educ, Minsk, BELARUS
关键词
BRCA1; breast cancer; founder mutations; genetic susceptibility; ovarian cancer; radiation; ESTROGEN-RECEPTOR; GENE; 5382INSC; CARRIERS; RISKS; SUSCEPTIBILITY; PREVALENCE; PATHOLOGY; TUMORS; CHEK2;
D O I
10.1111/j.1399-0004.2010.01473.x
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
Breast cancer and ovarian cancer are common malignancies in Belarus accounting for about 3500 and 800 new cases per year, respectively. For breast cancer, the rates and age of onset appear to vary significantly in regions differentially affected by the Chernobyl accident. We assessed the frequency and distribution of three BRCA1 founder mutations 5382insC, 4153delA and Cys61Gly in two hospital-based series of 1945 unselected breast cancer patients and of 201 unselected ovarian cancer patients from Belarus as well as in 1019 healthy control females from the same population. Any of these mutations were identified in 4.4% of the breast cancer patients, 26.4% of the ovarian cancer patients and 0.5% of the controls. In the breast cancer patients, BRCA1 mutations were strongly associated with earlier age at diagnosis, with oestrogen receptor (ER) negative tumours and with a first-degree family history of breast cancer, although only 35% of the identified BRCA1 mutation carriers had such a family history. There were no marked differences in the regional distribution of BRCA1 mutations, so that the significant differences in age at diagnosis and family history of breast cancer patients from areas afflicted by the Chemobyl accident could not be explained by BRCA1. We next observed a higher impact and a shifted mutational spectrum of BRCA1 in the series of Byelorussian ovarian cancer patients where the three founder mutations accounted for 26.4% (53/201). While the Cys61Gly mutation appeared underrepresented in ovarian cancer as compared with breast cancer cases from the same population (p = 0.01), the 4153delA mutation made a higher contribution to ovarian cancer than to breast cancer (p < 0.01). BRCA1 mutations were significantly enriched among ovarian cancer cases with a first-degree family history of breast or ovarian cancer, whereas the median age at ovarian cancer diagnosis was not different between mutation carriers and non-carriers. Taken together, these results identify three BRCA1 founder mutations as key components of inherited breast and ovarian cancer susceptibility in Belarus and might have implications for cancer prevention, treatment and genetic counselling in this population.
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收藏
页码:364 / 372
页数:9
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