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Peripheral primitive neuroectodermal tumors. Diagnosis, classification, and prognosis.
1Laboratory of Pathology, National Institutes of Health, Bethesda, Md.
Perspectives in Pediatric Pathology
|January 1, 1992
Summary
Peripheral primitive neuroectodermal tumors (PNET) have been redefined using advanced genetic and histopathologic methods. Many tumors formerly called Ewing
Area of Science:
- Oncology
- Pathology
- Genetics
Background:
- Peripheral primitive neuroectodermal tumors (PNET) and Ewing's sarcoma were previously often misclassified.
- Histopathologic, ultrastructural, and immunophenotypic characteristics are crucial for accurate diagnosis.
- Small round cell tumors require precise differentiation due to overlapping features.
Purpose of the Study:
- To detail the redefinition of peripheral primitive neuroectodermal tumors (PNET).
- To highlight the diagnostic challenges and advancements in classifying small round cell tumors.
- To emphasize the role of molecular and cytogenetic analyses in distinguishing tumor types.
Main Methods:
- Cytogenetic and molecular genetic analyses.
- Histopathologic examination, including ultrastructural and immunophenotypic characterization.
- Flow cytometry for prognostic group distinction.
Main Results:
- Peripheral PNET are now recognized as a distinct entity, differentiating from Ewing's sarcoma.
- Consistent cytogenetic abnormalities and neurotransmitter enzyme patterns suggest a common neuroectodermal origin for Ewing's sarcoma and PNET.
- Molecular and cytogenetic differences confirm distinct clinical and biological profiles between PNET and neuroblastoma.
Conclusions:
- Recent advancements have refined the classification of peripheral primitive neuroectodermal tumors.
- Accurate histopathologic and molecular distinctions are vital for understanding prognosis and guiding treatment.
- Further molecular genetic and flow cytometric evaluations offer potential for new clinical trials.