OncoScan analysis of breast carcinomas from the Swedish haemangioma cohort

The Swedish haemangioma cohort consists of 17,200 women treated with radium-226 for skin haemangioma at an early age (<1.5 years of age) between 1920 and 1965. A total of 877 breast cancer cases were reported by December 2009, estimating an excess relative and absolute risk at the age of 50 years of 0.48 Gy^(−1) and 10.4 (10^4 PYR Gy)^(−1), respectively. We screened 31 primary breast carcinomas for genetic alterations using the OncoScan CNV Plus Assay to assess genomic instability. Copy number analysis of Affymetrix OncoScan CNV Plus arrays was performed on 31 formamid-fixed paraffin-embedded breast tumours.