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Pleomorphic xanthoastrocytoma: a comparative pathological study between conventional and anaplastic types.
T Hirose1, K Ishizawa, K Sugiyama
1Department of Pathology, Saitama Medical School, Saitama, Japan. thirose@saitama-med.ac.jp
Histopathology
|January 11, 2008
Summary
Anaplastic pleomorphic xanthoastrocytoma (PXA) requires careful diagnosis. Distinguishing it from glioblastoma involves identifying conventional PXA features and neuronal markers for better survival outcomes.
Area of Science:
- Neuro-oncology
- Pathology
- Cancer Biology
Background:
- Pleomorphic xanthoastrocytoma (PXA) is a rare glial tumor.
- Anaplastic PXA represents a more aggressive subtype.
- Accurate differentiation from other high-grade gliomas is crucial for patient management.
Purpose of the Study:
- To enhance understanding of the anaplastic variant of pleomorphic xanthoastrocytoma (PXA).
- To provide diagnostic criteria for distinguishing anaplastic PXA from other brain tumors.
- To identify features associated with prognosis in anaplastic PXA.
Main Methods:
- Comparative analysis of six conventional and six anaplastic PXA cases.
- Histopathological examination including mitotic activity, necrosis, and microvascular proliferation.
- Immunohistochemical analysis for neuronal markers and Ki67.
- Fluorescence in situ hybridization for epidermal growth factor receptor (EGFR).
Main Results:
- Anaplastic PXAs exhibited increased mitotic activity, necrosis, and microvascular proliferation.
- Conventional PXA features were present in anaplastic areas.
- Ki67 labeling indices were significantly higher in anaplastic PXA.
- No significant differences in immunohistochemical profiles for neuronal markers or EGFR were observed.
Conclusions:
- Anaplastic PXA can arise de novo or upon recurrence.
- Distinguishing anaplastic PXA from glioblastoma relies on identifying conventional PXA features and neuronal marker expression.
- These diagnostic markers are associated with a better prognosis for anaplastic PXA patients.
