Abstract
Purpose
We investigated the expression status of vascular endothelial growth factor (VEGF), platelet-derived growth factor (PDGF)-B and their receptors in organ-confined clear cell renal cell carcinoma (ccRCC) to evaluate their prognostic significance after radical surgery.
Methods
In 758 consecutive patients diagnosed with pT1-2N0 ccRCC between 2007 and 2012, we prospectively investigated the expression levels of VEGF, PDGF-B, VEGF receptor (VEGFR) and PDGF receptor (PDGFR)-β via immunohistochemistry. Clinicopathologic parameters and expression of the angiogenic factors were analyzed with respect to recurrence-free survival (RFS) after nephrectomy. The median follow-up was 29.5 months (IQR 21.5, 39.6) after surgery.
Results
Partial nephrectomy had been performed in 48.5 % of the patients, and tumors were staged as pT1a in 514 (67.8 %), pT1b in 192 (25.3 %) and pT2 in 52 (6.9 %). VEGF, PDGF and their receptors were identified in the cytoplasm and membranes of the tumor cells. Expression level of VEGFR inversely correlated with both tumor size (r = −0.076, p = 0.014) and nuclear grade (r = −0.297, p = 0.004). As for PDGF-B, the expression level showed an inverse correlation with tumor size (r = −0.216, p < 0.001) while PDGFR-β inversely correlated with nuclear grade (r = −0.341, p = 0.001). On multivariate analysis, age, pathologic stage, nuclear grade and PDGFR-β expression (high vs. low or none, HR 3.121 95 % CI 1.300–7.493, p = 0.011) were independently prognostic of RFS after nephrectomy.
Conclusions
In organ-confined ccRCC, high expression of PDGFR-β was independently predictive of poorer RFS after nephrectomy.
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Shim, M., Song, C., Park, S. et al. Prognostic significance of platelet-derived growth factor receptor-β expression in localized clear cell renal cell carcinoma. J Cancer Res Clin Oncol 141, 2213–2220 (2015). https://doi.org/10.1007/s00432-015-2019-x
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DOI: https://doi.org/10.1007/s00432-015-2019-x