Abstract
Purpose
The androgen receptor (AR) is intensively discussed as a prognostic and/or predictive marker in breast cancer patients.
Methods
We evaluated the value of AR mRNA expression with the Affymetrix HG-U 133A array in 3 different cohorts: a cohort of breast cancer patients who received adjuvant treatment (cohort A; n = 165), a cohort of untreated breast cancer patients (cohort B; n = 200) and a cohort of chemotherapy-treated breast cancer patients with estrogen receptor (ER)-positive tumors (cohort C; n = 223).
Results
AR mRNA expression was associated with lower grading (Grades 1 and 2) as well as ER and progesterone receptor (PgR) positivity in all cohorts. In the treated cohort (cohort A), low androgen receptor expression was associated with shorter event-free survival (OR 2,34, 95 % CI 1.01–5.43, p = 0.047) which was not seen in the untreated cohort B. Subgroup analysis revealed that shorter survival of patients with low AR mRNA expression was observed mainly in the ER-positive subgroup of patients treated with adjuvant chemotherapy. In the validation cohort C we could confirm a benefit of chemotherapy for the group of tumors with high AR mRNA expression (5-year event-free survival (EFS) 74 % versus 57 %, p = 0.013). In this cohort, low AR mRNA expression was associated with shorter event-free survival also in multivariate analysis (OR 2.86, 95 % CI 1.29–6.35, p = 0.010) adjusted for HER2, ki-67, tumor size, age and tumor grade.
Conclusions
We provide evidence that AR expression is associated with chemotherapy responsiveness in ER-positive patients.



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Isabell Witzel and Monika Graeser equally contributed to this work.
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Witzel, I., Graeser, M., Karn, T. et al. Androgen receptor expression is a predictive marker in chemotherapy-treated patients with endocrine receptor-positive primary breast cancers. J Cancer Res Clin Oncol 139, 809–816 (2013). https://doi.org/10.1007/s00432-013-1382-8
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DOI: https://doi.org/10.1007/s00432-013-1382-8