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10 December 2018 : Laboratory Research  

Integrin Subunit beta 8 (ITGB8) Upregulation Is an Independent Predictor of Unfavorable Survival of High-Grade Serous Ovarian Carcinoma Patients

Jing He1ABCDEF, Yan Liu2CDEF, Lixia Zhang3BCD, Hongwei Zhang4ABCDEF*

DOI: 10.12659/MSM.911518

Med Sci Monit 2018; 24: LBR8933-8940

Abstract

BACKGROUND: ITGB8 encodes a β subunit of integrin (integrin β8), which is upregulated in some types of cancer. In the current study, we examined the expression profile of ITGB8 in serous ovarian cancer (SOVC) and investigated its potential as an independent prognostic indicator for overall survival (OS) and recurrence-free survival (RFS) in high-grade SOVC.

MATERIAL AND METHODS: A secondary study was conducted based on genomic and survival data in large online databases, including the Gene Expression Omnibus (GEO), the Human Protein Atlas (HPA), and the Cancer Genome Atlas-Ovarian cancer (TCGA-OV). Kaplan-Meier curves were generated to evaluate the association between ITGB8 expression and OS/RFS. Univariate and multivariate analysis were performed with the Cox regression model.

RESULTS: ITGB8 was significantly upregulated in ovarian cancer tissues compared to that in normal ovary tissues. High-grade SOVC patients with high ITGB8 expression had significantly shorter OS and RFS compared to their low-expression counterparts. Increased ITGB8 expression might be an independent prognostic indicator of unfavorable OS (HR: 1.424, 95%CI: 1.228–1.653, p<0.001) and RFS (HR: 2.167, 95%CI: 1.507–3.114, p<0.001) in high-grade SOVC. DNA amplification was frequent (149/509, 29.3%) in high-grade SOVC patients and was associated with increased ITGB8 expression compared to the copy-neutral cases.

CONCLUSIONS: ITGB8 expression might be a valuable prognostic biomarker in high-grade SOVC, the expression of which might be regulated by its DNA copy numbers.

Keywords: Integrins, Prognosis

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750