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Urinary matrix metalloproteinase activity is not significantly altered in patients with renal cell carcinoma

Glenn M Cannon1, Robert H Getzenberg

  • 1Department of Urology, University of Pittsburgh, Pittsburgh, Pennsylvania 15213-3232, USA. cannongm@upmc.edu

Urology
|March 29, 2006
PubMed
Abstract

Insights

Urinary matrix metalloproteinase (MMP) activity, measured by collagen IV degradation, did not prove effective in diagnosing renal cell carcinoma (RCC). Most healthy individuals exhibited significant MMP activity, limiting its diagnostic utility for this cancer.

Area of Science:

  • Biochemistry
  • Oncology
  • Urology

Background:

  • Matrix metalloproteinases (MMPs) are enzymes involved in extracellular matrix degradation.
  • Elevated MMPs in urine have been suggested as a potential biomarker for various cancers, including renal cell carcinoma (RCC).
  • Collagen IV degradation by MMPs is a key process in tumor invasion and metastasis.

Purpose of the Study:

  • To evaluate the diagnostic utility of urinary matrix metalloproteinase (MMP) activity for identifying renal cell carcinoma (RCC).
  • To confirm if a fluorescent microplate activity assay measuring collagen IV degradation can serve as a diagnostic test for RCC.

Main Methods:

  • Urine samples were collected from 21 patients with renal masses, 2 patients with suspected RCC recurrence, and 47 healthy volunteers.
  • Urine samples were incubated with fluorescein-labeled collagen IV.
  • Fluorescence activity was measured to quantify collagen IV degradation, indicating MMP activity.

Main Results:

  • Fifteen of 21 patients undergoing nephrectomy had RCC; both patients with retroperitoneal mass excision had confirmed RCC recurrence.
  • Mean fluorescence units in RCC patients were 48,924 (range 0–275,879) versus 29,834 (range 0–400,086) in healthy individuals.
  • The difference in MMP activity between RCC patients and healthy volunteers was not statistically significant (P = 0.34).

Conclusions:

  • Urinary MMP activity, as measured by collagen IV degradation, is not a reliable diagnostic test for identifying RCC.
  • Significant MMP activity was observed in the urine of most healthy individuals, confounding its use as a specific cancer biomarker.
  • Further research may be needed to explore other biomarkers or refine existing assays for RCC detection.

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