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Abstract

ABSTRACT: BACKGROUND: Matrixmetalloproteinases (MMPs) are a class of matrix basement membrane degrading enzymes which were shown to be associated with metastases in several human tumors. OBJECTIVE: This study is aimed to investigate the potential effect of MMP-9 in imparting the frequently reported different behavioral pattern between jaws and long bones osteosarcomas. METHODS: Tissue blocks of ten cases of jaws osteosarcomas and another ten of long bones osteosarcomas were collected and stained immunohistochemically with monoclonal antibodies to MMP-9. RESULTS: The majority of cases (70%) were positive for MMP-9 expression which indicates a role in tumor spread, however; there was no significant difference between the sites. CONCLUSION: The study indicates that MMP-9 is probably not involved in the biologic differences between jaws and long bones osteosarcomas

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