Intensive expression of Bmi-1 is a new independent predictor of poor outcome in patients with ovarian carcinoma.

Abstract:

BACKGROUND:It has been suggested that the B-cell specific moloney leukemia virus insertion site 1 (Bmi-1) gene plays an oncogenic role in several types of human cancer, but the status of Bmi-1 amplification and expression in ovarian cancer and its clinical/prognostic significance are unclear. METHODS:The methods of immunohistochemistry and fluorescence in situ hybridization were utilized to examine protein expression and amplification of Bmi-1 in 30 normal ovaries, 30 ovarian cystadenomas, 40 borderline ovarian tumors and 179 ovarian carcinomas. RESULTS:Intensive expression of Bmi-1 was detected in none of the normal ovaries, 3% cystadenomas, 10% borderline tumors, and 37% ovarian carcinomas, respectively. Amplification of Bmi-1 was detected in 8% of ovarian carcinomas. In ovarian carcinomas, significant positive associations were found between intensive expression of Bmi-1 and the tumors ascending histological grade, later pT/pN/pM and FIGO stages (P < 0.05). In univariate survival analysis of the ovarian carcinoma cohorts, a significant association of intensive expression of Bmi-1 with shortened patient survival (mean 49.3 months versus 100.3 months, p < 0.001) was demonstrated. Importantly, Bmi-1 expression provided significant independent prognostic parameters in multivariate analysis (p = 0.005). CONCLUSIONS:These findings provide evidence that intensive expression of Bmi-1 might be important in the acquisition of an invasive and/or aggressive phenotype of ovarian carcinoma, and serve as a independent biomarker for shortened survival time of patients.

journal_name

BMC Cancer

journal_title

BMC cancer

authors

Yang GF,He WP,Cai MY,He LR,Luo JH,Deng HX,Guan XY,Zeng MS,Zeng YX,Xie D

doi

10.1186/1471-2407-10-133

subject

Has Abstract

pub_date

2010-04-08 00:00:00

pages

133

issn

1471-2407

pii

1471-2407-10-133

journal_volume

10

pub_type

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