TY - JOUR
T1 - Androgen receptor-positive triple negative breast cancer
T2 - A unique breast cancer subtype
AU - McGhan, Lee J.
AU - McCullough, Ann E.
AU - Protheroe, Cheryl A.
AU - Dueck, Amylou C.
AU - Lee, James J.
AU - Nunez-Nateras, Rafael
AU - Castle, Erik P.
AU - Gray, Richard J.
AU - Wasif, Nabil
AU - Goetz, Matthew P.
AU - Hawse, John R.
AU - Henry, Travis J.
AU - Barrett, Michael T.
AU - Cunliffe, Heather E.
AU - Pockaj, Barbara A.
N1 - Funding Information:
ACKNOWLEDGMENT Funded in part by the Translational Genomics Research Institute (TGen) and Mayo Clinic 445 North Fifth Street, Phoenix, Arizona Collaborative Research Seed Grant Proposal (IRB 08-006579).
PY - 2014/2
Y1 - 2014/2
N2 - Background: The significance of androgen receptor (AR) expression in triple-negative breast cancer (TNBC) is unclear, and published studies so far have been inconclusive. Methods: A tissue microarray was constructed using tissue obtained from 119 patients with primary TNBC and stained for AR expression. Other tissue types obtained included recurrent TNBC, normal breast tissue, adjacent ductal carcinoma-in situ (DCIS), lymph node (LN) and distant metastases. Positive AR expression was defined as ≥10 % nuclear staining. Results: Epithelial tissue was present and evaluable in 94 TNBC patients with a total of 177 tissue cores. AR expression in TNBC was 22 of 94 (23 %). AR expression was higher in normal breast tissue (88 %) and adjacent DCIS (73 % overall). All LN metastases from AR-positive TNBC patients were also AR positive; in addition, no AR-negative TNBC patient had AR-positive LNs. AR expression was associated with older patient age (63 vs. 57 years, respectively, p = 0.051) and LN metastases (p = 0.033). Locoregional recurrence and overall/disease-specific survival were similar between AR-positive and AR-negative patients, although AR-positive patients had more advanced disease. On multivariate analysis, the presence of LN metastases was associated with poorer recurrence-free survival in AR-positive patients (hazard ratio, 4.34) (p = 0.031). Conclusions: The AR is expressed in normal breast tissue, and expression decreases with advancement to DCIS and invasive cancer. AR-positive TNBC was more common in older patients and had a higher propensity for LN metastases. AR-positive TNBC may represent a breast cancer subtype with unique features that may be amenable to treatment with alternative targeted therapies.
AB - Background: The significance of androgen receptor (AR) expression in triple-negative breast cancer (TNBC) is unclear, and published studies so far have been inconclusive. Methods: A tissue microarray was constructed using tissue obtained from 119 patients with primary TNBC and stained for AR expression. Other tissue types obtained included recurrent TNBC, normal breast tissue, adjacent ductal carcinoma-in situ (DCIS), lymph node (LN) and distant metastases. Positive AR expression was defined as ≥10 % nuclear staining. Results: Epithelial tissue was present and evaluable in 94 TNBC patients with a total of 177 tissue cores. AR expression in TNBC was 22 of 94 (23 %). AR expression was higher in normal breast tissue (88 %) and adjacent DCIS (73 % overall). All LN metastases from AR-positive TNBC patients were also AR positive; in addition, no AR-negative TNBC patient had AR-positive LNs. AR expression was associated with older patient age (63 vs. 57 years, respectively, p = 0.051) and LN metastases (p = 0.033). Locoregional recurrence and overall/disease-specific survival were similar between AR-positive and AR-negative patients, although AR-positive patients had more advanced disease. On multivariate analysis, the presence of LN metastases was associated with poorer recurrence-free survival in AR-positive patients (hazard ratio, 4.34) (p = 0.031). Conclusions: The AR is expressed in normal breast tissue, and expression decreases with advancement to DCIS and invasive cancer. AR-positive TNBC was more common in older patients and had a higher propensity for LN metastases. AR-positive TNBC may represent a breast cancer subtype with unique features that may be amenable to treatment with alternative targeted therapies.
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U2 - 10.1245/s10434-013-3260-7
DO - 10.1245/s10434-013-3260-7
M3 - Article
C2 - 24046116
AN - SCOPUS:84896702428
SN - 1068-9265
VL - 21
SP - 361
EP - 367
JO - Annals of surgical oncology
JF - Annals of surgical oncology
IS - 2
ER -