Abstract
We investigated immunohistochemically the leukocyte infiltrate [CD3, CD4, CD8, CD11a, CD11b, CD14, CD56, VLA-4 and platelet endothelial cell adhesion molecule-1 (PECAM-1)] and the endothelial expression of cell adhesion molecules (PECAM-1, VCAM-1, ICAM-1 and ICAM-2) in 23 renal cell carcinoma tumor tissues. Tumors with a moderate or high density of PECAM-1 positive endothelia showed a stronger infiltration with PECAM-1-positive leukocytes as compared to tumors with a low density of positive endothelia (p<0.0085). Additionally, overall survival of patients who presented with tumors exhibiting a moderate or high density of PECAM-1 endothelia alone or in combination with a PECAM-1-positive infiltrate was extended (median survival: 23.5 months) as compared to patients without these tumor characteristics (median survival: 6.5 months). These results suggest an involvement of PECAM-1 in the process of leukocyte migration and a potential role as a prognostic marker in renal cell carcinoma.
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