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Expression of cytochrome P450 3A4 and its clinical significance in human prostate cancer.

Abstract：

OBJECTIVES:To evaluate CYP3A4 expression in human prostrate cancer (PCa) tissues. Enzymes of the cytochrome P450 (CYP) family are key inactivators of testosterone in the liver and prostate. We previously reported that CYP2B6 is a growth-inhibitory and prognostic factor in human PCa; however, the status of CYP3A4 in PCa remains unclear. METHODS:We used immunohistochemistry to analyze CYP3A4 expression in 107 human PCa specimens obtained by radical prostatectomy. Stained slides were evaluated for the proportion and staining intensity of positively stained cells. Total immunoreactivity scores (0-8) were obtained as the sum of the proportion and intensity scores. In addition, we estimated the relationship between CYP3A4 status and clinicopathologic features. RESULTS:CYP3A4 immunoreactivity was identified in the cytoplasm of prostate cells. The CYP3A4 immunoreactive PCa score (3.6+/-2.6) was significantly lower than that of benign epithelium (4.5+/-2.1; P < .0001). In addition, CYP3A4 immunoreactivity correlated inversely with the Gleason score (P < .0001). Decreased CYP3A4 immunoreactivity was significantly related to a poor prognosis in human PCa (P = .0175). CONCLUSIONS:We demonstrated differential CYP3A4 expression in prostatic tissues, indicating that decreased CYP3A4 expression may contribute to the development of PCa.

journal_name

Urology

journal_title

Urology

authors

Fujimura T,Takahashi S,Urano T,Kumagai J,Murata T,Takayama K,Ogushi T,Horie-Inoue K,Ouchi Y,Kitamura T,Muramatsu M,Homma Y,Inoue S

doi

10.1016/j.urology.2009.02.033

subject

Has Abstract

pub_date

2009-08-01 00:00:00

pages

391-7

issue

2

eissn

0090-4295

issn

1527-9995

pii

S0090-4295(09)00300-8

journal_volume

74

pub_type

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