Pre-clinical and clinical significance of heparanase in Ewing's sarcoma

Itay Shafat, Myriam Weyl Ben-Arush, Josephine Issakov, Isaac Meller, Inna Naroditsky, Monica Tortoreto, Giuliana Cassinelli, Cinzia Lanzi, Claudio Pisano, Neta Ilan, Israel Vlodavsky*, Franco Zunino

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Heparanase is an endoglycosidase that specifically cleaves heparan sulphate side chains of heparan sulphate proteoglycans, activity that is strongly implicated in cell migration and invasion associated with tumour metastasis, angiogenesis and inflammation. Heparanase up-regulation was documented in an increasing number of human carcinomas, correlating with reduced post-operative survival rate and enhanced tumour angiogenesis. Expression and significance of heparanase in human sarcomas has not been so far reported. Here, we applied the Ewing's sarcoma cell line TC71 and demonstrated a potent inhibition of cell invasionin vitroand tumour xenograft growthin vivoupon treatment with a specific inhibitor of heparanase enzymatic activity (compound SST0001, non-anticoagulant N-acetylated, glycol split heparin). Next, we examined heparanase expression and cellular localization by immunostaining of a cohort of 69 patients diagnosed with Ewing's sarcoma. Heparanase staining was noted in all patients. Notably, heparanase staining intensity correlated with increased tumour size (P= 0.04) and with patients' age (P= 0.03), two prognostic factors associated with a worse outcome. Our study indicates that heparanase expression is induced in Ewing's sarcoma and associates with poor prognosis. Moreover, it encourages the inclusion of heparanase inhibitors (i.e.SST0001) in newly developed therapeutic modalities directed against Ewing's sarcoma and likely other malignancies.

Original languageEnglish
Pages (from-to)1857-1864
Number of pages8
JournalJournal of Cellular and Molecular Medicine
Issue number9
StatePublished - Sep 2011
Externally publishedYes


  • Age
  • Ewing's sarcoma
  • Heparanase
  • SST0001
  • Tumour size


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