Classification of renal cell carcinoma based on expression of VEGF and VEGF receptors in both tumor cells and endothelial cells

Recent development of antiangiogenic therapy for renal cell carcinoma (RCC) has significantly improved the treatment of these often refractory tumors. However, not all patients respond to therapy and assays for predicting outcome are needed. As a first step, we analyzed a retrospective cohort of tum...

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Veröffentlicht in:Laboratory investigation 2008-09, Vol.88 (9), p.962-972
Hauptverfasser: Kluger, Harriet M, Siddiqui, Summar F, Angeletti, Cesar, Sznol, Mario, Kelly, William K, Molinaro, Annette M, Camp, Robert L
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container_end_page 972
container_issue 9
container_start_page 962
container_title Laboratory investigation
container_volume 88
creator Kluger, Harriet M
Siddiqui, Summar F
Angeletti, Cesar
Sznol, Mario
Kelly, William K
Molinaro, Annette M
Camp, Robert L
description Recent development of antiangiogenic therapy for renal cell carcinoma (RCC) has significantly improved the treatment of these often refractory tumors. However, not all patients respond to therapy and assays for predicting outcome are needed. As a first step, we analyzed a retrospective cohort of tumors and assessed the ability of VEGF and VEGF receptors (VEGF-R1, -R2 and -R3) to classify tumors. We analyzed tissue microarrays containing 330 RCCs using a novel method of automated quantitative analysis of VEGF and VEGF-R expression by fluorescent immunohistochemistry. Expression of markers was separately quantified within three tissue components: tumor cells, endothelial cells and adjacent normal epithelium. VEGF and VEGF receptors were tightly coexpressed both within tumors and within adjacent normal cells (all P -values
doi_str_mv 10.1038/labinvest.2008.65
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However, not all patients respond to therapy and assays for predicting outcome are needed. As a first step, we analyzed a retrospective cohort of tumors and assessed the ability of VEGF and VEGF receptors (VEGF-R1, -R2 and -R3) to classify tumors. We analyzed tissue microarrays containing 330 RCCs using a novel method of automated quantitative analysis of VEGF and VEGF-R expression by fluorescent immunohistochemistry. Expression of markers was separately quantified within three tissue components: tumor cells, endothelial cells and adjacent normal epithelium. VEGF and VEGF receptors were tightly coexpressed both within tumors and within adjacent normal cells (all P -values &lt;0.001). Tumor cell expression of VEGF-R1 and -R2 was strongly and inversely correlated with vessel area ( P &lt;0.0001). Unsupervised hierarchical clustering classified tumors by coordinated expression of VEGF and VEGF-Rs. The distribution of clear cell and papillary tumors was not significantly different between clusters. Clusters with high expression of VEGF and VEGF-Rs in the tumor cells exhibited poor survival when compared with the other clusters on uni- and multivariable analysis. VEGF and VEGF receptors exhibit a complex pattern of coordinated expression in RCC. 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subjects Adult
Aged
Aged, 80 and over
Biological and medical sciences
Biotechnology
Carcinoma, Renal Cell - classification
Carcinoma, Renal Cell - metabolism
Endothelium, Vascular - metabolism
Fundamental and applied biological sciences. Psychology
Humans
Immunohistochemistry
Investigative techniques, diagnostic techniques (general aspects)
Kidney Neoplasms - classification
Kidney Neoplasms - metabolism
Laboratory Medicine
Medical sciences
Medicine
Medicine & Public Health
Middle Aged
Pathology
Receptors, Vascular Endothelial Growth Factor - metabolism
research-article
Tissue Array Analysis
Vascular Endothelial Growth Factor A - metabolism
title Classification of renal cell carcinoma based on expression of VEGF and VEGF receptors in both tumor cells and endothelial cells
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