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Clinical Cancer Research Vol. 5, 4085-4090, December 1999
© 1999 American Association for Cancer Research

Molecular Oncology, Markers, Clinical Correlates

Analysis of Oncogene and Tumor Suppressor Gene Alterations in Pediatric Malignant Astrocytomas Reveals Reduced Survival for Patients with PTEN Mutations1

Corey Raffel, Lori Frederick, Judith R. O’Fallon, Pamela Atherton-Skaff, Arie Perry, Robert B. Jenkins and C. David James2

Departments of Neurosurgery [C. R.], Laboratory Medicine and Pathology [L. F., R. B. J., C. D. J.], and Statistics [J. R. O., P. A-S.], Mayo Clinic and Foundation, Rochester, Minnesota 55905, and Department of Pathology, Washington University School of Medicine, St. Louis, Missouri 63110 [A. P.]

Although common among adult intracranial neoplasms, pediatric malignant astrocytomas (PMAs) comprise a relatively small proportion of the brain tumors that occur in children. The scarcity of such cases generally requires that molecular analyses of PMAs are based on the utilization of paraffin-embedded material, and here we have used 39 such specimens to examine the incidence and prognostic significance of oncogene and tumor suppressor gene alterations (including amplifications of EGFR, CDK4, and MDM2 as well as inactivating mutations of CDKN2A, TP53, and PTEN) in these tumors. In general, the frequency of alteration for the genes we have studied fell within ranges that have been reported for adult astrocytomas. However, EGFR amplification, which is usually observed in approximately 40% and 15% of adult grade 4 and grade 3 astrocytomas, respectively, was not detected in any member of this series. With regard to prognosis, PTEN mutations were significantly associated with decreased survival among grade 3 and grade 4 PMA patients, a potentially important observation because neither patient age nor tumor malignancy grade was correlated with outcome for these individuals. In total, our data suggest at least one significant distinction between the genetic etiology of pediatric and adult astrocytomas and additionally reveal that analysis of PTEN mutations in PMA patients may be useful in the differential diagnosis of these tumors.




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