Journal List > Korean J Urol > v.47(6) > 1069913

Won, Joo, Cho, Seo, Ahn, Kim, and Kim: Correlation of Caveolin-1 Expression on Tissue Microarray with Prognosis in Renal Cell Carcinoma

Abstract

Purpose

We investigated the relationship between the expression of caveolin-1, using a tissue microarray (TMA), and the prognosis of patients with renal cell carcinoma (RCC).

Materials and Methods

TMA sections of formalin-fixed, paraffin-embedded tissues of RCC from 82 patients, who had undergone radical nephrectomy, were stained immunohistochemically with specific antibodies against caveolin-1. The caveolin-1 immunostaining was semi-quantitatively estimated based on intensity. The expression pattern of caveolin-1 was compared with the clinicopathological variables.

Results

The expression of caveolin-1 was significantly correlated with tumor size (p=0.002), TNM stage (p<0.001), T stage (p=0.001), M stage (p=0.004), grade (p=0.028) and metastasis (p<0.001), and was also significantly higher in clear cell than non-clear cell RCC (p<0.001). The survival of patients with higher caveolin-1 expression was significantly worse than that of patients with lower caveolin-1 expression (p=0.001). Univariate analyses were able to identify all variables, including caveolin-1 expression as significant prognostic factors for cancer-specific survival; multivariate analyses indicated that TNM stage, M stage and grade were independent prognostic factors. Caveolin-1 expression was not an independent factor.

Conclusions

The increased expression of caveolin-1 is associated with tumor size, stage, grade, metastasis and a worse prognosis in RCC, which suggests that caveolin-1 may be important in the progression of RCC.

Figures and Tables

Fig. 1
Tissue microarray (TMA) slide of renal cell carcinoma tissues. (A) TMA paraffin block of renal cell carcinoma. (B) Immunohistochemically stained TMA slide (×40).
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Fig. 2
Immunohistochemical staining for caveolin-1 in renal cell carcinoma tissues (×400). (A) Endothelial cells are stained as an internal control, but cancer cells are not stained (caveolin-1 intensity 0). (B) Cancer cells are strongly stained for caveolin-1 (intensity 3).
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Fig. 3
Kaplan-Meier cancer-specific survival curves according to the expression of caveolin-1. The survival of patients with higher caveolin-1 expression is significantly worse than that of patients with lower caveolin-1 expression (p=0.001).
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Table 1
Clinicopathological data of 82 patients with renal cell carcinoma
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Table 2
Relationship between the expression of caveolin-1 and the clinicopathological variables in 82 patients with renal cell carcinoma
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Table 3
Univariate and multivariate survival analysis of 82 patients with renal cell carcinoma
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