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(American Journal of Pathology. 2001;158:735-743.)
© 2001 American Society for Investigative Pathology

Regular Article

Expression Levels of Genes that Regulate Metastasis and Angiogenesis Correlate with Advanced Pathological Stage of Renal Cell Carcinoma

Joel W. Slaton^*, Keiji Inoue, Paul Perrotte^*, Adel K. El-Naggar, David A. Swanson^*, Isaiah J. Fidler and Colin P. N. Dinney^*

From the Departments of Urology,^*
Cancer Biology,
and Pathology,
The University of Texas M. D. Anderson Cancer Center, Houston, Texas

We examined the expression levels of a number of metastasis-related genes to determine the relationship of these levels to the development of metastasis in renal cell carcinoma. Gene expression was examined in 46 formalin-fixed, paraffin-embedded, archival specimens of primary organ-confined, clear-cell, renal cell carcinoma from patients who had undergone radical nephrectomy. Twenty samples were from patients who did not have metastasis after a median of 48 months; 26 were from patients with either synchronous or metachronous metastases. Microvessel density was assessed by anti-CD-34 immunohistochemical analysis. The expression levels of basic fibroblast growth factor (bFGF), vascular endothelial growth factor (VEGF), interleukin-8 (IL-8), matrix metalloproteinases (MMP)-2 and -9, and E-cadherin were examined at the periphery of the tumor by a colorimetric in situ mRNA. The expression levels of bFGF, VEGF, IL-8, MMP-2, and MMP-9 were significantly higher in primary renal tumors from patients with either synchronous or metachronous metastases than those who were disease-free at a median of 48 months of follow-up. Multivariate analysis of disease-free survival showed that the ratio of MMP-9 to E-cadherin (P = 0.012) and the expression level of bFGF expression (P = 0.045), were independent predictors for the development of metastases. The expression levels of bFGF, VEGF, and IL-8 did not correlate with microvessel density, which in itself was not a significant predictor of progression (P = 0.21). In summary, expression levels of genes that regulate metastasis angiogenesis can predict the metastatic potential in individual patients with organ-confined clear-cell renal carcinoma.

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