Journal of Clinical Pathology 2007;60:804-807
ORIGINAL ARTICLE
Expression of c-kit in human osteosarcoma and its relevance as a prognostic marker
1 Clinical Institute of Pathology, Medical University of Vienna, Vienna, Austria
2 Department of Orthopaedics, Medical University of Vienna, Vienna, Austria
Correspondence to:
Correspondence to:
Dr Irene Sulzbacher
Clinical Institute of Pathology, Medical University of Vienna, Waehringer Guertel 18-20, A-1090 Vienna, Austria; irene. sulzbacher{at}meduniwien.ac.at
Aims: To examine the prognostic relevance of c-kit expression in human osteosarcomas and to evaluate the mutation status in exon 9 and exon 11 of the c-kit gene.
Methods: c-kit expression was examined in 100 human osteosarcomas by immunohistochemistry using paraffin embedded tumour tissues, and capillary sequencing of genomic DNA was performed to search for mutations in exons 9 and 11 of the c-kit gene.
Results: 20 osteosarcomas showed c-kit expression ranging from 5% to 90% (mean 5.9%; SD 16.74%). Furthermore, DNA sequences of exon 9 and exon 11 of the c-kit gene were not altered in these tumours. Overall and disease free survival analysis did not reveal any differences between patients with osteosarcoma with c-kit expression and those with c-kit negative tumours.
Conclusions: C-kit expression is not a prognostic marker in patients with osteosarcoma. The protein expression is not linked to mutations in exon 9 or exon 11 of the c-kit gene. Therefore, these exons may not function as targets for treatment modalities based on the suppression of c-kit tyrosine kinase activity.
Abbreviations: GIST, gastrointestinal stroma tumour; PDGF, platelet derived growth factor; PDGFRA, platelet derived growth factor receptor alpha
Keywords: osteosarcoma; c-kit; prognosis; mutation
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