A low proportion of BRCA2 mutations in Finnish breast cancer families.
One hundred breast cancer families were identified at the Helsinki University Central Hospital in Finland and were screened for germ-line mutations in the coding regions and splice boundaries of the BRCA2 gene. Eight families (8%) were found to carry five different mutations, all of which are predicted to prematurely truncate the protein product. These BRCA2 families have early-onset breast cancer (mean and median age = 49 years), with four of the eight families including ovarian cancer but with no families including male breast cancer. A wide spectrum of other cancers also is seen in these families. Three mutations were identified in more than one family, and haplotype analysis in the families suggested a common founder for each recurrent mutation. One recurrent mutation, 999del5, previously has been noted as a common mutation in Iceland. The relationship between the Icelandic 999del5 mutation and the Finnish 999del5 mutation was explored by comparison of families from both countries. A common haplotype covering a minimal region intragenic to the BRCA2 gene was shared between the Icelandic and the Finnish mutation carriers.
Vehmanen
P
P
Department of Obstetrics and Gynecology, Helsinki University Central Hospital, Finland.
Friedman
L S
LS
Eerola
H
H
Sarantaus
L
L
Pyrhönen
S
S
Ponder
B A
BA
Muhonen
T
T
Nevanlinna
H
H
D000328:Adult; D000368:Aged; D024682:BRCA2 Protein; D001943:Breast Neoplasms / Q000453:epidemiology / Q000235:genetics*; D005260:Female; D005387:Finland / Q000453:epidemiology; D018703:Founder Effect; D006239:Haplotypes; D006801:Humans; D007055:Iceland / Q000453:epidemiology; D008875:Middle Aged; D009154:Mutation; D009363:Neoplasm Proteins / Q000235:genetics*; D010051:Ovarian Neoplasms / Q000453:epidemiology / Q000235:genetics*; D010375:Pedigree; D011110:Polymorphism, Genetic; D014157:Transcription Factors / Q000235:genetics*
D024682:BRCA2 Protein; D009363:Neoplasm Proteins; D014157:Transcription Factors