The BRCA1/BRCA2/Rad51 complex is a prognostic and predictive factor in early breast cancer
2007 (English)In: Radiotherapy and Oncology, ISSN 0167-8140, E-ISSN 1879-0887, Vol. 84, no 3, 242-251 p.Article in journal (Refereed) Published
Background and Purpose: The breast cancer susceptibility genes BRCA1 and BRCA2 interact with Rad51, one of the central components in the homologous recombination repair pathway. This study evaluates the prognostic and predictive role of BRCA1, BRCA2 and Rad51, individually and as a complex, in breast cancer.
Material and Methods: Expression of BRCA1, BRCA2 and Rad51 was investigated using immunohistochemistry in tumours from 224 women with early breast cancer, who were randomised to receive postoperative radiotherapy or adjuvant chemotherapy (CMF).
Results: 53% (112/212) of the tumours had reduced expression of the BRCA1/BRCA2/Rad51 complex. Low expression correlated to high histologic grade (p=0.05). Patients with low expression of the complex developed significantly more local recurrences as compared to patients with high expression (RR=3.20, 95% C.I. 1.48-6.88, p=0.003). Expression of the BRCA1/BRCA2/Rad51 complex was an independent prognostic factor in multivariate analysis (p=0.03). Patients with low expression of the complex responded well to radiotherapy (RR=0.31, 95% C.I. 0.14-0.70, p=0.005), whereas patients with high expression had few local recurrences and no additional benefit from radiotherapy (RR=1.08, 95% C.I. 0.40-2.90, p=0.88).
Conclusions: Low expression of the BRCA1/BRCA2/Rad51 complex is a marker of poor prognosis, but predicts good effect of radiotherapy in patients with early breast cancer.
Place, publisher, year, edition, pages
2007. Vol. 84, no 3, 242-251 p.
Radiotherapy; Breast cancer; BRCA1; BRCA2; Rad51
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:liu:diva-17953DOI: 10.1016/j.radonc.2007.06.012OAI: oai:DiVA.org:liu-17953DiVA: diva2:213081