Estrogen receptor β expression and androgen receptor phosphorylation correlate with a poor clinical outcome in hormone-naive prostate cancer and are elevated in castration-resistant disease

Zellweger, Tobias; Stürm, Susanne; Rey, Silvia; Zlobec, Inti; Gsponer, Joel R.; Rentsch, Cyrill A.; Terracciano, Luigi M.; Bachmann, Alexander; Bubendorf, Lukas; Ruiz, Christian (2013). Estrogen receptor β expression and androgen receptor phosphorylation correlate with a poor clinical outcome in hormone-naive prostate cancer and are elevated in castration-resistant disease. Endocrine-related cancer, 20(3), pp. 403-413. BioScientifica Ltd. 10.1530/ERC-12-0402

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Patients with advanced prostate cancer (PC) are usually treated with androgen withdrawal. While this therapy is initially effective, nearly all PCs become refractory to it. As hormone receptors play a crucial role in this process, we constructed a tissue microarray consisting of PC samples from 107 hormone-naïve (HN) and 101 castration-resistant (CR) PC patients and analyzed the androgen receptor (AR) gene copy number and the protein expression profiles of AR, Serin210-phosphorylated AR (pAR(210)), estrogen receptor (ER)β, ERα and the proliferation marker Ki67. The amplification of the AR gene was virtually restricted to CR PC and was significantly associated with increased AR protein expression (P<0.0001) and higher tumor cell proliferation (P=0.001). Strong AR expression was observed in a subgroup of HN PC patients with an adverse prognosis. In contrast, the absence of AR expression in CR PC was significantly associated with a poor overall survival. While pAR(210) was predominantly found in CR PC patients (P<0.0001), pAR(210) positivity was observed in a subgroup of HN PC patients with a poor survival (P<0.05). Epithelial ERα expression was restricted to CR PC cells (9%). ERβ protein expression was found in 38% of both HN and CR PCs, but was elevated in matched CR PC specimens. Similar to pAR(210), the presence of ERβ in HN patients was significantly associated with an adverse prognosis (P<0.005). Our results strongly suggest a major role for pAR(210) and ERβ in HN PC. The expression of these markers might be directly involved in CR tumor growth.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > Service Sector > Institute of Pathology

UniBE Contributor:

Zlobec, Inti and Terracciano, Luigi

Subjects:

500 Science > 570 Life sciences; biology
600 Technology > 610 Medicine & health

ISSN:

1351-0088

Publisher:

BioScientifica Ltd.

Language:

English

Submitter:

Andrea Arnold

Date Deposited:

03 Apr 2014 14:13

Last Modified:

03 Apr 2014 14:13

Publisher DOI:

10.1530/ERC-12-0402

PubMed ID:

23580588

Uncontrolled Keywords:

prostate cancer, castration resistance, hormone receptors, hormone naïve, androgen receptor, estrogen receptor

URI:

https://boris.unibe.ch/id/eprint/46162

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