Screening for mutations in exon 11 of the BRCA1 gene in 70 Italian breast and ovarian cancer patients by protein truncation test.

Abstract:

:The most common mutations in the familial breast and ovarian cancer susceptibility gene BRCA1 are frameshift and nonsense mutations, which lead to the synthesis of truncated proteins. On this ground, we have analysed BRCA1 exon 11, which includes about 61% of coding region, in germline DNA from 70 Italian breast and/or ovarian cancer patients, using the protein truncation test (PTT). BRCA1 mutations were identified in nine of 29 (approximately 31%) patients with a family history of cancer and in three of 41 (approximately 7%) women with early-onset breast carcinomas, and were subsequently characterized by sequence analysis. In addition, BRCA1 mutations were also detected in six affected relatives of two positive index cases. The observed frequencies of mutations were not significantly different from those expected on the basis of the phenotypic characteristics of patients and their families, indicating that PTT is a rapid and sensitive method that can be used for a first BRCA1 mutational screening. The histological findings in BRCA1 mutated cases showed that eight of nine (approximately 89%) breast carcinomas were of grade III and nine of 9 (100%) ovarian carcinomas were of the endometrioid type (eight of grade III and one of grade II). This suggests that specific histological characteristics may represent additional criteria for selection of cases eligible to BRCA1 mutational analysis.

journal_name

Oncogene

journal_title

Oncogene

authors

De Benedetti VM,Radice P,Mondini P,Spatti G,Conti A,Illeni MT,Caligo MA,Cipollini G,Bevilaqua G,Pilotti S,Pierotti MA

subject

Has Abstract

pub_date

1996-09-19 00:00:00

pages

1353-7

issue

6

eissn

0950-9232

issn

1476-5594

journal_volume

13

pub_type

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