Tumor-derived hyaluronidase: a diagnostic urine marker for high-grade bladder cancer.

Abstract:

:The detection of high-grade bladder tumors prior to invasion is crucial for a good prognosis. We recently found that the levels of hyaluronic acid (HA), a glycosaminoglycan, are elevated in the urine of bladder cancer patients, and small angiogenic HA fragments are present in the urine of high-grade bladder cancer patients. Hyaluronidase is an enzyme that degrades HA into small angiogenic fragments. We compared the urinary hyaluronidase levels of normal individuals and patients with bladder cancer or other genitourinary conditions, using a substrate (HA)-gel technique and an ELISA-like assay. Among the 139 specimens analyzed, the urinary hyaluronidase levels in patients with G2/G3 tumors (33.4 +/- 4.5 milliunits/mg protein) are 5-8-fold higher than those in normal individuals (4.2 +/- 1.2 milliunits/mg protein) and those in patients with G1 tumors (6.5 +/- 1.7 milliunits/mg protein) or other genitourinary conditions (7.4 +/- 1.4 milliunits/mg protein; P < 0.001). Urinary hyaluronidase measurement shows a sensitivity of 100% and a specificity of 88.8% to detect high-grade bladder (G2/G3) tumors. Thus urinary hyaluronidase measurement is a simple, noninvasive yet highly specific and sensitive method for high-grade bladder cancer detection. The increase in urinary hyaluronidase levels is due to the secretion of a tumor-associated hyaluronidase into the urine because the hyaluronidase levels in G2/G3 tumor tissues are also higher (6-7-fold) than those in normal bladder and G1 tumor tissues (P < 0.001). The bladder tumor-associated hyaluronidase activity is distinct from other hyaluronidases, has a pH optimum of 4.3, and is attributed to two proteins with molecular masses of 65 kD (p65) and 55 kD (p55).

journal_name

Cancer Res

journal_title

Cancer research

authors

Pham HT,Block NL,Lokeshwar VB

subject

Has Abstract

pub_date

1997-02-15 00:00:00

pages

778-83

issue

4

eissn

0008-5472

issn

1538-7445

journal_volume

57

pub_type

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