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Published in: BMC Cancer 1/2014

Open Access 01-12-2014 | Research article

MICA/B and ULBP1 NKG2D ligands are independent predictors of good prognosis in cervical cancer

Authors: Hanbyoul Cho, Joon-Yong Chung, Sunghoon Kim, Till Braunschweig, Tae Heung Kang, Jennie Kim, Eun Joo Chung, Stephen M Hewitt, Jae-Hoon Kim

Published in: BMC Cancer | Issue 1/2014

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Abstract

Background

NKG2D (natural killer group 2, member D) is thought to play an important role in mediating the activation of anticancer immune response. Expression of NKG2D ligands (NKG2DLs) is pronounced in malignancies and the heterogeneity of NKG2DL expression remains unclear. Here, we investigate the expression and clinical significance of NKG2DLs in cervical cancer.

Methods

Immunohistochemical analyses of MICA/B, ULBP1, ULBP2, ULBP3, RAET1E, and RAET1G were performed using tissue microarray analysis of 200 cervical cancers, 327 high-grade cervical intraepithelial neoplasias (CINs), 99 low-grade CINs, and 541 matched nonadjacent normal cervical epithelial tissues and compared the data with clinicopathologic variables, including the survival of cervical cancer patients.

Results

MICA/B, ULBP1, and RAET1E expression was higher in cervical cancer than in low-grade CIN (p < 0.001, p = 0.012, p = 0.013, respectively) and normal cervix (all p < 0.001). Among these markers, expression of ULBP1 was significantly different depending on patient tumor stage (p = 0.010) and tumor size (p = 0.045). ULBP1 expression was correlated with MICA/B (p < 0.001) and ULBP2 (p = 0.002) expression in cervical cancer. While MICA/B+ or ULBP1+ patients had improved disease-free survival time (p = 0.027 and p = 0.009, respectively) relative to that of the low expression group, RAET1E+ or RAET1G+ was correlated with shorter survival time (p = 0.018 and p = 0.029, respectively). However, in terms of overall survival, the ULBP1+ group had significantly longer survival time than the low expression group (p = 0.009). Multivariate analysis indicated that MICA/B+/ULBP1+ (HR = 0.16, p = 0.015) and ULBP1+ (HR = 0.31, p = 0.024) are independent prognostic factors of disease-free survival in cervical cancer.

Conclusions

High expression of either ULBP1 or MICA/B and ULBP1 combined is an indicator of good prognosis in cervical cancer, suggesting their potential utility as prognostic tests in clinical assessment.
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Metadata
Title
MICA/B and ULBP1 NKG2D ligands are independent predictors of good prognosis in cervical cancer
Authors
Hanbyoul Cho
Joon-Yong Chung
Sunghoon Kim
Till Braunschweig
Tae Heung Kang
Jennie Kim
Eun Joo Chung
Stephen M Hewitt
Jae-Hoon Kim
Publication date
01-12-2014
Publisher
BioMed Central
Published in
BMC Cancer / Issue 1/2014
Electronic ISSN: 1471-2407
DOI
https://doi.org/10.1186/1471-2407-14-957

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