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[Cancer Research 61, 6713-6715, September 15, 2001]
© 2001 American Association for Cancer Research

Advances in Brief

Tumor Location and Growth Pattern Correlate with Genetic Signature in Oligodendroglial Neoplasms1

Magdalena C. Zlatescu, AliReza TehraniYazdi, Hikaru Sasaki, Joseph F. Megyesi, Rebecca A. Betensky, David N. Louis and J. Gregory Cairncross2

Departments of Oncology and Clinical Neurological Sciences, University of Western Ontario and London Regional Cancer Centre, London, Ontario, Canada N6A 4L6 [M. C. Z., A. T. Y., J. F. M., J. G. C.]; Department of Biostatistics, Harvard School of Public Health, Boston, Massachusetts 02115 [R. A. B.]; and Department of Pathology and Neurosurgical Service, Massachusetts General Hospital, and Harvard Medical School, Boston, Massachusetts 02114 [H. S., D. N. L.]

Molecular genetic subsets of anaplastic oligodendroglioma behave in biologically distinct ways, in both their rates of growth and their responses to standard therapies. In a series of 64 cases, we evaluated whether allelic loss of chromosomal arms 1p and 19q, an early molecular event in the genesis of chemosensitive oligodendrogliomas, is related to tumor location and extent of tumor spread in the brain. We observed that tumor genotype was closely associated with tumor location (P < 0.001). Anaplastic oligodendrogliomas located in the frontal, parietal, and occipital lobes were significantly more likely to harbor allelic loss of chromosomal arms 1p and 19q than histologically indistinguishable tumors arising in the temporal lobe, insula, and diencephalon (P < 0.001). In addition, loss of heterozygosity for 1p and 19q was significantly associated with a bilateral pattern of growth (P = 0.037); all seven bilaterally distributed anaplastic oligodendrogliomas had 1p and 19q allelic loss. We conclude, therefore, that molecular subtypes of oligodendrogliomas may arise preferentially in certain lobes of the brain and have differential patterns of growth, with tumors having allelic loss of chromosomes 1p and 19q occurring most frequently in the frontal lobes and having a tendency for widespread growth across the midline. These findings encourage inquiries into the biological basis of such marked differences and already have implications for the current management of these neoplasms.




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