Thymidine phosphorylase/platelet-derived endothelial cell growth factor (PD-ECGF) associated with prognosis in renal...

We investigated the correlation between thymidine phosphorylase (TP)/platelet-derived endothelial cell growth factor (PD-ECGF) expression, angiogenesis, and prognosis in renal cell carcinoma (RCC) patients. We prepared paraffin block specimens from 56 postradical nephrectomy RCC patients. The preparations were immunohistochemically stained using anti-CD34 antibody and anti-TP antibody. Angiogenic findings were evaluated based on both microvessel density (MVD) and renal arteriography findings as classified by Roosen et al. TP expression showed heterogeneity in 56 patients: 11 (19.6%) were negative, 28 (50.0%) weak, and 17 (30.4%) positive. There was no correlation between TP expression, MVD, and renal arteriography. There was no TP expression in chromophobe types. Univariate analysis showed a significant correlation between survival and TP expression, patient age, tumor infiltration type, pathologic T- and N-stages, venous involvement, distant metastasis, and tumor grade. There was no correlation between survival and MVD or renal arteriography. Multivariate analysis showed a significant correlation between survival and pathologic T-stage, distant metastasis, tumor infiltration type, and TP expression. TP expression in RCC may be an independent prognostic factor rather than just an index for angiogenesis.