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Research ArticleClinical Studies

Androgen Receptor as a Biomarker of Oral Squamous Cell Carcinoma Progression Risk

CEDNA TOMASOVIC-LONCARIC, ALEKSANDRA FUCIC, ANA ANDABAK, MATEJ ANDABAK, MARCELLO CEPPI, MARCO BRUZZONE, DANKO VRDOLJAK and VANJA VUCICEVIC-BORAS
Anticancer Research August 2019, 39 (8) 4285-4289; DOI: https://doi.org/10.21873/anticanres.13593
CEDNA TOMASOVIC-LONCARIC
1Clinical Hospital “Dubrava”, Zagreb, Croatia
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ALEKSANDRA FUCIC
2Institute for Medical Research and Occupational Health, Zagreb, Croatia
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  • For correspondence: afucic@imi.hr
ANA ANDABAK
3School of Dentistry, University of Zagreb, Zagreb, Croatia
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MATEJ ANDABAK
1Clinical Hospital “Dubrava”, Zagreb, Croatia
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MARCELLO CEPPI
4Ospedale Policlinico San Martino, Genova, Italy
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MARCO BRUZZONE
4Ospedale Policlinico San Martino, Genova, Italy
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DANKO VRDOLJAK
5Clinic for tumours, Clinical Hospital Center Sisters of Mercy, Zagreb, Croatia
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VANJA VUCICEVIC-BORAS
3School of Dentistry, University of Zagreb, Zagreb, Croatia
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Abstract

Background/Aim: Oral squamous cell carcinoma (OSCC) is a cancer with poor prognosis due to therapy resistance, locoregional recurrences, and distant metastases. There is on increased interest in profiling the androgen receptor (AR) in cancer biology. The aim of this study was to compare AR and Ki-67 levels in the neoplastic epithelium and stroma between non-metastatic and metastatic stages of OSCC. Patients and Methods: Tissue specimens of 101 non-metastatic and 95 metastatic OSCC patients were analyzed by immunohistochemistry. Results: More than 20% of AR-positive cytoplasmic staining of OSCC epithelium was significantly associated with nuclear AR levels in the epithelium and increased AR levels in the stroma. In metastatic OSCC patients, Ki-67 was significantly higher than in non-metastatic OSCC patients. Conclusion: More than 20% of AR-positive cytoplasmic staining in neoplastic OSSC epithelium is a significant predictor of OSCC progression risk.

  • Androgen receptor
  • Ki67
  • oral squamous cell carcinoma
  • metastasis
  • biomarker

Oral squamous cell carcinoma (OSCC) is the most common type of oral cavity cancer that has poor prognosis due to therapy-resistant, locoregional recurrences and distant metastases. Despite significant advancements in therapy, it is still a major concern worldwide. The five-year survival rate of oral cancer is 62.1% (1). Therapy of OSCC includes surgery and radiotherapy. The identification of the high-risk subset of OSCC is critical for producing a more successful therapy (2, 3).

The significance of androgen receptors (AR) in the aetiology and progression of cancer has been recognized and is considered a novel potential target for better diagnostics and novel therapy options. AR levels are known to be associated with progression in several cancer types (4-8). However, there is a clear gap in data on the association of AR levels with OSCC. In vitro experiments and a study with patients have shown that OSCC cells express AR and that AR is critical for promoting cell growth (9, 10).

AR is a ligand-activated transcription factor, which in the absence of a hormone ligand (testosterone and dihydrotestosterone), is located preferentially in the cytoplasm. After activation, cytoplasmic AR translocates into the nucleus, where the AR-ligand complex binds androgen response elements in the gene promoter and enhancer regions of multiple target genes (11). In breast cancer, it has been shown that higher expression of AR in the nucleus than in the cytoplasm is associated with worse prognosis due to the AR activation of tumour genes such as vimentin (12).

Tumour stroma as a significant component of neoplastic progression has also been associated with AR levels (13, 14). An activated tumour stroma contains activated fibroblasts that induce the production of growth factors, cytokines, chemokines and metalloproteinases, which have roles in cancer cell differentiation, proliferation and local invasion (15).

The aim of this study was to investigate (a) the association between AR levels in the cytoplasm and nucleus of the OSCC neoplastic epithelium of non-metastatic and metastatic OSCC, (b) the levels of AR in stroma, (c) the association between epithelium AR and stroma AR and (d) the relationship of AR levels in non-metastatic and metastatic OSCC with Ki-67 activity. Results of this study should lead to the identification of new tools to recognize a subgroup of patients with a higher risk of metastasis.

Patients and Methods

In this study, 101 non-metastatic and 95 metastatic OSCC patients (78.1 % males and 29.9% females) were analysed. Stages of OSSC cancer ranged from T1N0 to T4N2. The mean age of patients was 62.59±11.24 years (range=31-92 years). All of the performed procedures were in accordance with the ethical standards of the 1964 Declaration of Helsinki I. The study was approved by the Ethics Committee of Clinical Hospital “Dubrava”, Zagreb, Croatia. Tissue specimens used in the current study were part of the hospital's tissue archive.

Resected tissue specimens were formalin-fixed, paraffin-embedded, and cut on a microtome to form tissue sections (thickness 5 μm). Immunohistochemical analyses were performed using a streptavidin-biotin method on a DAKO autostainer with monoclonal antibodies for AR (AR 441, DAKO, 1:50 dilution) and Ki-67 (K 8000, DAKO, 1:75 dilution) as a proliferative marker. Monoclonal antibodies were used after heat induced epitope retrieval (PT-LINK, 97 C). For visualisation Polymer Conjugate Envision FLEX with DAB chromogen (K 8000, DAKO, Glostrup, Denmark) was applied. The immunohistochemistry was performed on Dako Autostainer plus. Sections were counterstained with hematoxylin and eosin. As a positive control prostate tissue was used. Immunoreactivity reactions were determined in the cytoplasm and nucleus of neoplastic epithelium and stromal components under the magnification of 400X for a total of 1,000 tumour cells.

Statistics. A logistic regression model was applied to the binary outcome metastatic stage no/yes to estimate the predictability of the AR level in cytoplasm ≥20% with respect to <20% level on the risk of the occurrence of metastases, adjusting by age and gender. To investigate the relationship between Ki67 and cytoplasmic AR in occurrence of metastasis, the log-normal regression model was applied. This statistical model was also used to test the association between nuclear AR levels in epithelial and stromal cells with cytoplasmic AR.

Results

Table I shows the profiles of the studied patients. More than 20 % of cytoplasmic epithelium AR positivity was significantly associated with an increase in AR nuclear positivity of neoplastic epithelium cells and stromal cells. Thus, patients with cytoplasmic AR≥20% in epithelial cells had an average nuclear AR levels higher 2.57 times (95%CI=1.92-3.43; p<0.001) than patients with cytoplasmic AR<20% adjusting for age, gender and occurrence of metastasis; likewise cytoplasmic AR more than 20% is significantly associated with increased AR levels in stromal cells (p<0.001).

Results from the logistic regression model applied to the binary outcome metastatic stage no/yes show that males have more risk of metastasis than women (OR=2.11; 95%CI=1.01-4.39; p=0.047) and a frequency of AR receptors in the cytoplasm greater than 20%, is associated with the occurrence of metastasis (OR=1.87; 95%CI=1.03-3.40; p=0.040) (Table II).

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Table I.

Description of the characteristics of patients examined.

In metastatic OSCC patients with more than 20% of cytoplasmic AR, a significant increase in Ki-67 by 28% was observed in the epithelium compared to the non-metastatic OSCC group (Table III).

Discussion

The results of this study showed for the first time that more than 20% AR-positive cytoplasmic staining in the neoplastic epithelium can be used as a predictor of a significantly increased risk of metastasis in OSCC patients. This cut-off value is significantly associated with an increase in the AR nuclear positivity of neoplastic epithelium cells and increased levels of AR in stromal cells. Additionally, in metastatic OSCC patients with more than 20% cytoplasmic AR positive cells, there was a significant (28%) increase of Ki-67 in the epithelium compared to non-metastatic OSCC patients. Although the number of cases was small, our results showed that males have a higher risk of metastasis than women.

During the last decade, a significant increase in the survival rate has been reported for patients with OSCC which is an aggressive cancer type with limited therapeutic options and late diagnostics, (16). Therefore, it is of great importance to introduce biomarkers that will enable therapy planning and recognition of subgroups that are at higher risk of metastasis and may need specific follow up after therapy.

Current data showed that oestrogen and testosterone play a significant role in the aetiology and progression of all cancer types (7, 17, 18). Potency of hormonal therapy in different cancer types other than breast, testis, ovarian and prostate cancer was already recognized several decades ago. However, only recently the mechanisms of hormonal therapy were elucidated, providing the foundations for more efficient hormonal therapy, especially in the context of immunotherapy and personalized medicine (19-21).

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Table II.

Results of the logistic regression model applied to the binary outcome metastatic stage no/yes.

The AR is a transcription factor with broad tissue distribution and a major mediator of cellular functions and homeostasis. AR resides in an inactive state in the cytoplasm in complexes with molecular chaperones such as HSP90. Activation of AR by testosterone results in its translocation from the cytoplasm to the nucleus and ultimately regulation of the cellular transcriptional profile (22). Our findings in this study are in concordance with these mechanisms as presence of increased AR levels in cytoplasm of neoplastic epithelium are associated with increased nuclear positivity and indicators of cancer progression such as increased AR positivity in stroma cells and increased levels of Ki67 in metastatic patients.

One of possible mechanisms which bridge AR and Ki67 activities could involve kallikrein as has been shown in head and neck squamous cell carcinoma cells (23). Glandular kallikrein 1(KLK1) which is specific for head and neck cancer is a target of AR (24). KLK1 released from tumour cells enzymatically generates mitogenic kinins (25) and facilitates the dissemination of tumour cells (26). Mechanisms similar to those involved in kalilikrein 7-mediated increase in ki67 levels in colon cancer (27) may also be present in OSCC.

The stroma is composed of fibroblasts, smooth muscle cells, immune cells, lymphatics, and an extracellular matrix rich in signal molecules such as cytokines, growth factors, hormones, enzymes, etc. In addition to cell-cell interaction, these molecules mediate communication, through multidirectional signalling, between stromal and epithelial compartments. During carcinogenesis, significant changes are present in stroma including loss of smooth muscle cells and activation of myofibroblasts, termed cancer associated fibroblasts (CAFs). Activated cancer stroma enables and facilitates migration of neoplastic cells and disease progression. Targeting the stroma as a key neoplastic micromilleu has been suggested for decades but only recently have its role and mechanisms been better understood, thus opening options for complementary therapy development (13, 28, 29).

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Table III.

Estimates from the log-normal regression model applied to Ki67 in the epithelium to verify the relationship with cytoplasmic AR and occurrence of metastasis.

Current knowledge on the dynamics of AR and its interplay with stroma is almost exclusively based on data collected for prostate cancer and anecdotal studies on breast cancer (30-33). However, stromal-epithelial interactions have been shown to orchestrate AR signalling and tumorigenesis (34). Thus, it has been suggested that AR expressed in the stroma of oesophageal carcinoma may induce paracrine effects following stimulation by androgens possibly via fibroblast growth factors (35). The stroma has been already suggested as a prognostic tool in OSCC (36). Thus, in addition to confirming AR as a prognostic biomarker for metastasis, our results highlight the need of inclusion of a cut off value of 20% AR positivity in epithelial cytoplasm in patho-histological diagnostics.

Our finding that male OSCC patients have higher risk of metastasis than women is in concordance with sex-specific incidence and survival rate in different cancer types. Such difference may originate from differential susceptibility to environmental factors but also from differential effects of therapy. (37, 38). This is very important in preventive measures and therapy planning.

In conclusion, our results gave, for the first time, a cut off value of 20% AR positivity in the cytoplasm of neoplastic OSCC epithelium as a prognostic biomarker for metastasis risk. Additionally, it showed a clear association between AR levels in epithelium and stroma, and highlighted the impact of this interaction on neoplastic proliferation potency in OSCC. These findings should be further investigated for future therapeutic treatments. Introduction of AR as a biomarker of OSCC progression in pathohistological diagnostics is suggested.

Acknowledgements

This study was funded by the Croatian Science Foundation (project “The role of androgen and oestrogen receptors in the stromal activation of patients with head and neck cancers and its influence on patients surviva” (No:IP-2014-09-6985).

Footnotes

  • ↵* These Authors contributed equally to the preparation of the manuscript.

  • Authors' Contributions

    CTL and AF perform analysis and drafted the manuscript. AM, DV and MM selected patients, collected clinical data and drafted the manuscript. MC and MB performed statisctical analysis, data interpretation and drafted the manuscript. VVB provided design of the study and drafted the manuscript.

  • Conflicts of Interest

    The Authors declare no conflict of interests regarding this study.

  • Received May 25, 2019.
  • Revision received June 14, 2019.
  • Accepted June 18, 2019.
  • Copyright© 2019, International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved

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Anticancer Research: 39 (8)
Anticancer Research
Vol. 39, Issue 8
August 2019
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Androgen Receptor as a Biomarker of Oral Squamous Cell Carcinoma Progression Risk
CEDNA TOMASOVIC-LONCARIC, ALEKSANDRA FUCIC, ANA ANDABAK, MATEJ ANDABAK, MARCELLO CEPPI, MARCO BRUZZONE, DANKO VRDOLJAK, VANJA VUCICEVIC-BORAS
Anticancer Research Aug 2019, 39 (8) 4285-4289; DOI: 10.21873/anticanres.13593

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Androgen Receptor as a Biomarker of Oral Squamous Cell Carcinoma Progression Risk
CEDNA TOMASOVIC-LONCARIC, ALEKSANDRA FUCIC, ANA ANDABAK, MATEJ ANDABAK, MARCELLO CEPPI, MARCO BRUZZONE, DANKO VRDOLJAK, VANJA VUCICEVIC-BORAS
Anticancer Research Aug 2019, 39 (8) 4285-4289; DOI: 10.21873/anticanres.13593
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Keywords

  • androgen receptor
  • Ki67
  • Oral squamous cell carcinoma
  • metastasis
  • biomarker
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