Prognostic value of androgen receptor expression

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Breast Cancer - Targets and Therapy
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Open Access Full Text Article
Prognostic value of androgen receptor expression
in triple negative breast carcinomas: personal
experience and comments on a review about
“Triple-negative breast cancer: treatment
challenges and solutions” by Collignon et al
This article was published in the following Dove Press journal:
Breast Cancer - Targets and Therapy
19 August 2016
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Antonio Ieni 1
Valeria Barresi 1
Giuseppina Rosaria Rita
Ricciardi 2
Barbara Adamo 3
Vincenzo Adamo 2
Giovanni Tuccari 1
1
Department of Human Pathology of
Adult and Evolutive Age “Gaetano
Barresi”, Section of Pathology,
University of Messina, AOU
“Policlinico G Martino”; 2Medical
Oncology Unit AOOR PapardoPiemonte, Department of Human
Pathology of Adult And Evolutive
Age “Gaetano Barresi”, University
of Messina, Messina, Italy; 3Medical
Oncology Hospital Clinic, Barcelona,
Spain
Correspondence: Giovanni Tuccari
Department of Human Pathology of
Adult and Evolutive Age “Gaetano
Barresi”, Azienda Ospedaliera
Universitaria “Policlinico G Martino” pad. D, Via Consolare Valeria, 1, 98125
Messina, Italy
Tel +39 90 221 2539
Fax +39 90 292 8150
Email [email protected]
Dear editor
Recently, we read with great interest the review by Collignon et al entitled “Triplenegative breast cancer: treatment challenges and solutions”,1 which appeared in the
last issue of Breast Cancer: Targets and Therapy. In this article, the authors extensively
reviewed studies concerning the opportunity to identify triple negative breast carcinoma
(TNBC) subtypes by newly proposed markers, taking into account their biological
heterogeneity on the light of clinical implications.
It is well known that TNBC represents ~15% of all breast cancers and they are
distinguished by the lack of expression of the estrogen and progesterone receptor
using immunohistochemistry (IHC) and by the lack of overexpression and/or amplification of HER2 obtained using IHC and/or fluorescence in situ hybridization.1 The
clinicopathological characteristics of this subtype include tumors of large size, highly
undifferentiated, high proliferative index, central necrosis, multiple apoptotic cells,
and high-positive lymph nodes.
However, utilizing gene expression profiling of TNBC, a luminal androgen receptor
subtype has been identified among others.2 Moreover, a recent systematic meta-analysis
of 19 different studies showed that the expression of androgen receptor (AR) is a favorable prognostic marker, providing the rationale for the development of a Phase II study
with bicalutamide, a nonsteroidal antiandrogen in the treatment of metastatic TNBC-AR
positive (NCT00468715).3 In relation to this hypothesized role of AR, we would report
herein our previous immunohistochemical experience in a cohort of TNBC.4 In detail,
we have found AR immunopositivity (IHC >10%) in 26.6% of TNBC cases; moreover,
both univariate and multivariate analyses showed that AR is significantly associated with
overall survival, representing an independent variable able to identify a TNBC subtype.4
These data further confirm the significantly positive correlation between AR expression
and favorable survival in TNBC patients since higher AR expression predicted a better
relapse-free survival in patients with chemoresistant TNBC, as reported elsewhere.5
In light of the abovementioned studies, we fully agree with the suggestion of
­Collignon et al1 regarding the block of AR pathway as promising approach in the
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you hereby accept the Terms. Non-commercial uses of the work are permitted without any further permission from Dove Medical Press Limited, provided the work is properly attributed. For
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http://dx.doi.org/10.2147/BCTT.S113577
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Ieni et al
t­ reatment of patients with the luminal AR subtype of TNBC.
In fact, this new targeted therapy shows potential advantages,6
although more additional studies are needed to be validated
in order to acquire a prognostic/predictive significance of
AR in TNBC. However, the documented inverse correlation
between low AR expression and high Ki67 rate has been
significantly correlated with a shorter overall survival and
a more aggressive disease in TNBC.4 Therefore, our data
suggest that an immunohistochemical tissue approach by the
combination of AR expression and Ki-67 status might be a
useful prognostic marker in TNBC in order to subclassify
the risk of these patients.
Disclosure
The authors report no conflicts of interest in this
communication.
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References
1. Collignon J, Lousberg L, Schroeder H, Jerusalem G. Triple-negative
breast cancer: treatment challenges and solutions. Breast Cancer: Targets
and Therapy. 2016;8:93–107.
2. Lehmann BD, Bauer JA, Chen X, et al. Identification of human triplenegative breast cancer subtypes and preclinical models for selection of
targeted therapies. J Clin Invest. 2011;121(7):2750–2767.
3. Gucalp A, Tolaney S, Isakoff SJ, et al; Translational Breast Cancer
Research Consortium (TBCRC 011). Phase II trial of bicalutamide in
patients with androgen receptor-positive, estrogen receptor-negative
metastatic breast cancer. Clin Cancer Res. 2013;19(19):5505–5512.
4. Ricciardi GR, Adamo B, Ieni A, et al. Androgen receptor (AR), E-cadherin, and Ki-67 as emerging targets and novel prognostic markers in
triple-negative breast cancer (TNBC) patients. PLoS One. 2015;3(6):
e0128368.
5. Yu KD, Zhu R, Zhan M, et al. Identification of prognosis-relevant subgroups in patients with chemoresistant triple-negative breast cancer. Clin
Cancer Res. 2013;19(10):2723–2733.
6. Anestis A, Karamouzis MV, Dalagiorgou G, Papavassiliou AG. Is androgen receptor targeting an emerging treatment strategy for triple negative
breast cancer? Cancer Treat Rev. 2015;41(6):547–553.
Breast Cancer - Targets and Therapy 2016:8
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Prognostic value of AR expression in TNBC
Authors’ reply
Joëlle Collignon
Laurence Lousberg 1
Hélène Schroeder 1
Guy Jerusalem 1,2
1
1
Medical Oncology Department, CHU Sart Tilman Liege, Domaine
Universitaire du Sart Tilman, 2University of Liege, Liege, Belgium
Correspondence: Guy Jerusalem
Medical Oncology, Domaine Universitaire du Sart Tilman, Bâtiment B35,
Liège 4000, Belgium
Tel +32 4 366 7111
Email [email protected]
Dear editor
Thank you for having shared with us your interesting experience concerning the determination of the androgen receptor
status, the inverse correlation between KI67 and androgen
receptor expression, and the potential prognostic implications. Your results are in line with previous work published
in this field and further highlights that additional research in
this subgroup of triple negative breast cancer is definitively
needed. In particular, we hope that specific treatments will
allow us to do a major step forward in the treatment of a
subgroup of patients presenting with triple negative breast
cancer. Unfortunately, the results currently available with
antiandrogen therapy, although promising, represent rather
a very small step forward. Further research is also needed
in order to evaluate if standard immunohistochemistry
techniques can be an alternative to androgen-related gene
signatures for the identification of patients presenting better
outcome after antiandrogen therapy.
Disclosure
GJ has received honoraria from Amgen, Pfizer, Novartis,
Roche, and Celgene and research grants from Novartis,
Roche, and MSD. The authors report no other conflicts of
interest in this communication.
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