Two distinct types of blood vessels in clear cell renal cell carcinoma have contrasting prognostic implications

Clin Cancer Res. 2007 Jan 1;13(1):161-9. doi: 10.1158/1078-0432.CCR-06-0774.

Abstract

Purpose: Intratumoral microvascular density (MVD) has been controversial as an indicator of prognosis in clear cell renal cell carcinoma (CCRCC). Classification of the intratumoral blood vessels based on differential expressions of blood vessel markers has not been correlated with patient prognosis in CCRCC. In this study, we aimed to evaluate the association of different categories of blood vessels with the patients' outcomes.

Experimental design: Seventy-eight CCRCC patients who underwent nephrectomy alone were enrolled. Paraffin-embedded CCRCC tissues, together with 16 nonmalignant kidney cortex tissues, were used in tissue microarray analyses and conventional section analyses. The characteristics of intratumoral blood vessels were identified by multiple blood vessel markers and pericyte markers. A computerized image analysis program was used to quantitatively calculate the vascular density.

Results: Two distinct types of microvessels were identified in CCRCC: undifferentiated (CD31(+)/CD34(-)) and differentiated (CD34(+)) vessels. A higher undifferentiated MVD significantly correlated with higher tumor grades and shorter patient survival. In contrast, a higher differentiated MVD significantly correlated with lower tumor grade and longer survival. Multivariate analyses showed that undifferentiated MVD was an independent prognostic factor for patient survival. An inverse correlation between undifferentiated MVD and differentiated MVD was also identified in CCRCC.

Conclusions: This is the first report showing distinct types of vasculature in CCRCC correlated with contrasting prognoses. A refined classification of CCRCC based on vasculature is therefore important for evaluating prognosis, and it may also have therapeutic implications.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Antigens, CD34 / biosynthesis
  • Blood Vessels / pathology*
  • Carcinoma, Renal Cell / blood supply*
  • Carcinoma, Renal Cell / diagnosis*
  • Carcinoma, Renal Cell / pathology*
  • Disease-Free Survival
  • Female
  • Humans
  • Immunohistochemistry / methods
  • Kidney / blood supply*
  • Kidney / metabolism*
  • Male
  • Microcirculation
  • Middle Aged
  • Neovascularization, Pathologic*
  • Oligonucleotide Array Sequence Analysis
  • Platelet Endothelial Cell Adhesion Molecule-1 / biosynthesis
  • Prognosis
  • Treatment Outcome

Substances

  • Antigens, CD34
  • Platelet Endothelial Cell Adhesion Molecule-1