Radiation-associated breast tumors display a distinct gene expression profile

International Journal of Radiation Oncology, Biology, Physics
Annegien BroeksLaura J Van 't Veer

Abstract

Women who received irradiation for Hodgkin's lymphoma have a strong increased risk for developing breast cancer. Approximately 90% of the breast cancers in these patients can be attributed to their radiation treatment, rendering such series extremely useful to determine whether a common radiation-associated cause underlies the carcinogenic process. In this study we used gene expression profiling technology to assess gene expression changes in radiation-associated breast tumors compared with a set of control breast tumors of women unexposed to radiation, diagnosed at the same age. RNA was obtained from fresh frozen tissue samples from 22 patients who developed breast cancer after Hodgkin's lymphoma (BfHL) and from 20 control breast tumors. Unsupervised hierarchical clustering of the profile data resulted in a clustering of the radiation-associated tumors separate from the control tumors (p < 0.001). Using a supervised class prediction tool, a nearest centroid classifier of 198 probes was identified. The BfHL tumors were often of the intrinsic basal breast tumor subtype, and they showed a chromosomal instability profile and a higher expression of the proliferation marker Ki-67. These results indicate that radiation-associated tum...Continue Reading

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