Abstract | OBJECTIVE: METHODS: Based on histological parameters, 30 osteoblastomas were subclassified as classical osteoblastomas (23/30) or atypical osteoblastoma (high cellularity, prominent blue osteoid, and epithelioid osteoblasts--7/30). Comparative immunohistochemical and clinical analysis was performed in 17 cases of patients with high-grade osteosarcoma. Formalin-fixed, paraffin-embedded archival tissue was immunostained for p53 and proliferation cell nuclear antigen. Tumors with positive p53 stain underwent molecular analyses for fragments of exon 10. RESULTS: The mean proliferating cell nuclear antigen indexes for classical osteoblastoma, atypical osteoblastoma, and osteosarcoma were 33%, 61%, and 79%, respectively. The atypical subgroup showed similar results to those of the osteosarcoma group (P < 0.001). p53 protein was detected in 4 (13%) osteoblastomas (3 of these were atypical osteoblastoma), and 4 osteosarcomas (23%) also showed p53 positivity. DNA mutation performed in p53-positive cases was confirmed in exon 10 in 2 atypical osteoblastomas (2/3), 1 classical osteoblastoma (1/1), and 1 osteosarcoma (1/4). Disease recurrence was correlated with p53 expression (P = 0.009), atypical subtype (P = 0.031), spiculated blue bone on histology (P = 0.018), and proliferating-cell nuclear antigen labeling index > or =40 (P = 0.015). CONCLUSION:
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Authors | Cláudia Regina Gomes Cardim Mendes de Oliveira, Berenice Bilharino Mendonça, Olavo Pires de Camargo, Emilia Modolo Pinto, Sérgio Antonio Barbosa Nascimento, Maria do Rosario D O Latorre, Maria Claúdia Nogueira Zerbini |
Journal | Clinics (Sao Paulo, Brazil)
(Clinics (Sao Paulo))
Vol. 62
Issue 2
Pg. 167-74
(Apr 2007)
ISSN: 1807-5932 [Print] United States |
PMID | 17505702
(Publication Type: Comparative Study, Journal Article)
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Chemical References |
- Proliferating Cell Nuclear Antigen
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Topics |
- Adolescent
- Adult
- Bone Neoplasms
(genetics, immunology, pathology)
- Child
- Child, Preschool
- DNA Mutational Analysis
- Female
- Gene Expression Profiling
- Genes, p53
(genetics)
- Humans
- Immunohistochemistry
- Male
- Mutation
(genetics)
- Osteoblastoma
(genetics, immunology, pathology)
- Osteosarcoma
(genetics, immunology, pathology)
- Polymerase Chain Reaction
- Proliferating Cell Nuclear Antigen
(analysis, genetics)
- Retrospective Studies
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