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Aurora‐A over‐expression in high‐grade PIN lesions and prostate cancer
Author(s) -
McKlveen Buschhorn Holly,
Klein Robert R.,
Chambers Susan M.,
Hardy Margaret C.,
Green Sylvan,
Bearss David,
Nagle Raymond B.
Publication year - 2005
Publication title -
the prostate
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.295
H-Index - 123
eISSN - 1097-0045
pISSN - 0270-4137
DOI - 10.1002/pros.20247
Subject(s) - immunohistochemistry , prostate cancer , intraepithelial neoplasia , pathology , prostate , cancer , medicine , stromal cell , carcinogenesis , prostatectomy
Abstract BACKGROUND Over‐expression of Aurora‐A (Aurora 2 kinase, STK‐15), a protein found in centrosomes thought to be associated with genetic instability, has been previously documented in prostate cancer [Pihan et al.: Cancer Res 61(5):2212–2219, 2001]. It is unknown if this protein is also over‐expressed in high‐grade prostatic intraepithelial neoplasia (PIN) lesions. METHODS PIN lesions were examined for increased Aurora‐A using immunohistochemical staining on archival paraffin embedded prostatectomy tissue. Aurora‐A expression was scored using size, number, and staining intensity. Protein expression was examined and compared between stromal cells, normal glands, high‐grade PIN lesions, and invasive cancer. RESULTS Immunohistochemistry shows an increased expression of Aurora‐A in 96% of high‐grade PIN cases, and 98% in cancer lesions. Twenty‐nine percent of cases of normal glands from cancerous prostates also showed increased Aurora‐A expression. CONCLUSIONS Over‐expression of Aurora‐A is present in some normal and the majority of high‐grade PIN lesions indicating that this may be an early event that leads to the genetic instability seen in prostate carcinogenesis. © 2005 Wiley‐Liss, Inc.