Park JY, Choe M, Kang Y, Lee SS. IMP3, a Promising Prognostic Marker in Clear Cell Renal Cell Carcinoma.
KOREAN JOURNAL OF PATHOLOGY 2014;
48:108-16. [PMID:
24868223 PMCID:
PMC4026801 DOI:
10.4132/koreanjpathol.2014.48.2.108]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/03/2013] [Revised: 01/14/2014] [Accepted: 02/13/2014] [Indexed: 12/21/2022]
Abstract
Background
Insulin-like growth factor II mRNA-binding protein 3 (IMP3) has been reported as a prognostic biomarker in various cancers. To validate IMP3 as a prognostic biomarker in renal cell carcinoma (RCC), we investigated the expression of IMP3, p53, and Ki-67, and their associations with clinicopathologic outcomes.
Methods
We studied 148 clear cell RCCs (CCRCCs) from patients who underwent radical nephrectomy. The expression levels of IMP3, p53, and Ki-67 were assessed by immunohistochemical staining and the clinical and pathologic parameters were retrospectively reviewed.
Results
Twenty-nine percent of CCRCCs expressed IMP3. Forty-one percent of IMP3-immunopositive tumors developed metastases, while only 11.4% of IMP3-negative tumors developed metastases (p<.001). A Kaplan-Meier curve showed that patients with IMP3-immunopositive tumors had lower metastasis-free survival and cancer-specific survival than did those with IMP3-immunonegative tumors (p<.001 and p<.001, respectively). Expression of high Ki-67 proliferation index was also associated with a higher metastatic rate. In the multivariate Cox regression analysis, pT stage and IMP3-positivity were independently associated with disease-specific survival.
Conclusions
IMP3 is an independent prognostic biomarker for patients with CCRCC to predict metastasis and poor outcome.
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