Phospho-Akt Immunoreactivity in Prostate Cancer: Relationship to Disease Severity and Outcome, Ki67 and Phosphorylated EGFR Expression

Peter Hammarsten, Mariateresa Cipriano, Andreas Josefsson, Pär Stattin, Lars Egevad, Torvald Granfors and Christopher J Fowler

PLOS ONE, 2012, vol. 7, issue 10, 1-11

Abstract: Background: In the present study, we have investigated the prognostic usefulness of phosphorylated Akt immunoreactivity (pAkt-IR) in prostate cancer using a well-characterised tissue microarray from men who had undergone transurethral resection due to lower urinary tract symptoms. Methodology/Principal Findings: pAkt-IR in prostate epithelial and tumour cells was assessed using a monoclonal anti-pAkt (Ser473) antibody. Immunoreactive intensity was determined for 282 (tumour) and 240 (non-mlignant tissue) cases. Tumour pAkt-IR scores correlated with Gleason score, tumour Ki67-IR (a marker of cell proliferation) and tumour phosphorylated epidermal growth factor receptor (pEGFR)-IR. For cases followed with expectancy, a high tumour pAkt-IR was associated with a poor disease-specific survival, and the prognostic information provided by this biomarker was additive to that provided by either (but not both) tumour pEFGR-IR or Ki67-IR. Upon division of the cases with respect to their Gleason scores, the prognostic value of pAkt-IR was seen for patients with Gleason score 8–10, but not for patients with Gleason score 6–7. Conclusions/Significance: Tumour pAkt-IR is associated with both disease severity and disease-specific survival. However, its clinical use as a biomarker is limited, since it does not provide prognostic information in patients with Gleason scores 6–7.

Date: 2012
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0047994

DOI: 10.1371/journal.pone.0047994

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