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Forkhead protein FKHR and its phosphorylated form p-FKHR in human prostate cancer

Tarih
2007
Yazar
Thompson, Timothy C.
Ayala, Gustavo E.
Li, Rile
Erdamar, Sibel
Dai, Hong
Wheeler, Thomas M.
Frolov, Anna
Scardino, Peter T.
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Özet
In vitro studies suggest that the proapoptotic function of forkhead protein FKHR is probably inactivated by means of phosphorylation through the protein kinase B pathway. However, the clinical significance of FKHR in prostate cancer remains unclear. Six hundred forty radical prostatectornies were used for building tissue microarrays. Slides were stained with antibodies against FKHR and phosphorylated FKHR (p-FKHR). Correlations with cl in icopatho logic parameters were analyzed by Spearman rank test. Cox regression test and Kaplan-Meier test were used to determine the probability of disease recurrence, which is defined as a serurn prostate-specific antigen (PSA) level greater than 0.4 ng/ mL after radical prostatectomy. Nuclear FKHR level was higher in normal prostate than in benign prostatic hyperplasia and prostate cancer (P -.0000). Nuclear expression of FKHR was correlated with preoperative PSA level (p= 0.108, P=.029), extracapsular extension (p = 0.137, P =.005), and seminal vesicle invasion (p= 0.101, P=.039). FKHR expression was not a significant indicator of biochemical failure by either univariate or inultivariate analysis. Nuclear p-FKHR expression correlated with patients' age (p = 0. 179, P =.0003), Gleason score (p = 0. 130, P =.0083), extracapsular extension (p = 0.227, P =.0000), clinical stage (Union Internationale Contre le Cancer system) (p 0. 166, P =.0007), and lymph node status (p = 0. 10 1, P =.040 1). Cytoplasmic p-FKHR correlated with patients' age (p = 0. 146, P =.0030) and clinical stage (p = 0. 117, P =.0 180). Cytoplasmic p-FKH R was a significant indicator of biochemical recurrence (P =.0 164; hazard ratio, 1. 114-2.929). Nuclear p-FKHR strongly correlated with phosphorylated protein kinase B (p = 0.368, P -.0000), androgen receptor (p = 0.385, P =.0000), and Skp-2 (p = 0.170, P =.0036). Our data suggest that the proapoptotic role of FKHR is probably regulated by several signaling pathways in prostate cancer. (c) 2007 Published by Elsevier Inc.
Bağlantı
http://hdl.handle.net/20.500.12627/131493
https://doi.org/10.1016/j.humpath.2007.02.016
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