The Androgen Receptor in Breast Cancer: Biology and Treatment Considerations

Abstract

The androgen receptor (AR) is expressed in 70-90% of invasive breast cancers. Despite the ubiquitous expression of AR in both primary and metastatic breast cancers, the clinical significance of this hormone receptor as a prognostic/predictive marker and its functional role in tumorigenesis remains poorly understood. This review summarizes the recent progress made in understanding the role of the AR as a prognostic/predictive marker in breast cancer and the underlying mechanisms by which the androgensignaling pathway may be involved in breast cancer pathogenesis. In addition, this review examines the available clinical data for the use of androgen-blocking agents in the treatment of breast cancer and explores the ongoing development of newer AR-targeted agents in this setting.