The online version of this article (doi:10.1186/1477-7819-10-112) contains supplementary material, which is available to authorized users.
The authors declare that they have no competing interests.
XC performed the experiment and drafted the manuscript. JW participated in the data collection. XX acted as corresponding author and did the revisions. All authors read and approved the final manuscript.
Epithelial ovarian cancer (EOC) is an aggressive disease with poor prognosis. The expression of cytokine-induced apoptosis inhibitor 1 (CIAPIN1) correlates with the malignant progression of several cancers. However, the relationship between the subcellular localization of CIAPIN1 and clinical characteristics in EOC remains unclear.
Immunohistochemistry was performed to detect CIAPIN1 expression in 108 EOC tissues. CIAPIN1 expressions in eight fresh EOC tissues were detected by Western blotting. The relationship between CIAPIN1 subcellular expression and patients’ clinicopathological features, including prognosis, was evaluated. Immunohistochemistry and immunofluorescence were employed to assess the CIAPIN1 subcellular localization in the EOC cell lines A2780 and HO8910. In addition, all patients were followed up to assess the prognostic value of CIAPIN1 in patients with EOC.
CIAPIN1 is highly expressed in EOC, but is present at low levels in paired non-cancerous ovarian epithelial tissues. The results of Western blotting were in accordance with the immunohistochemical results. Poor differentiation of the tumors and EOC cell lines correlated with higher levels of CIAPIN1 nuclear expression. CIAPIN1 nuclear expression significantly correlated with the Federation International of Gynecology and Obstetrics (FIGO) stage and histological differentiation (P = 0.034 and P < 0.0001, respectively). Moreover, nuclear localization of CIAPIN1 was selected as an unfavorable prognostic factor by both univariate and multivariate analyses ( P < 0.001). However, no significant correlations were observed between cytoplasmic localization of CIAPIN1 and clinicopathological parameters.
CIAPIN1 might play a crucial role in the differentiation of EOC cells. Elevated expression of nuclear CIAPIN1 negatively correlated with the survival of EOC patients, suggesting that nuclear CIAPIN1 might serve as a prognostic biomarker for EOC patients.
Additional file 1: Table S1. Correlation between CIAPIN1 cytoplasm expression and clinical pathological parameters ( P < 0.05 statistically significant). Figure S1. Kaplan-Meier curves of postoperative survival of patients with cytoplasmic localization of CIAPIN1 expression. Patients with high cytoplasmic expression of CIAPIN1 in EOC; the survival was not statistically significant (log-rank test, P > 0.05). (DOC 180 KB)12957_2012_1116_MOESM1_ESM.doc
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