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Diagnostic and prognostic significance of
genetic regional heterogeneity in meningiomas
Wolfgang K. Pfisterer, Nicole C. Hank, Mark
C. Preul, William P. Hendricks, Jeanette Pueschel, Stephen W. Coons, Adrienne C.
Scheck
Neuro-Oncology Research
(W.K.P., N.C.H., W.P.H., J.P., A.C.S.), Neurosurgery Research Laboratory
(W.K.P., M.C.P., A.C.S.), and Division of Neuropathology (S.W.C.), Barrow
Neurological Institute of St. Joseph’s Hospital and Medical Center, Phoenix,
AZ 85013, USA.
We analyzed the frequency and regional distribution of cells with genetic
abnormalities of chromosomes 1, 14, and 22 in meningiomas.
This data was evaluated for correlation to the clinical outcome of the
patients.
Eight defined areas of each of 77 paraffin-embedded meningioma samples (59 grade
I, 13 grade II, and 5 grade III) were analyzed by fluorescent in situ
hybridization using bacterial artificial chromosome probes localized to
chromosomes 1p36.32, 1q25.3, 14q13.3, 14q32.12, 22q11.2, and 22q12.1-3.
Chromosome deletion was considered to be regionally heterogeneous if 7 regions
showed cells with chromosome deletions.
Deletion of 1p occurred in 35% of the grade I tumors.
Distribution of cells with 1p deletion was regionally heterogeneous in 25% and
homogeneous in 10% of grade I tumors.
Distribution of cells with deletion of 1p was regionally heterogeneous in 23%
and homogeneous in 69% of the grade II tumors.
All grade III meningiomas had homogeneous distribution of cells with deletion of
chromosome 1p.
Distribution of cells with deletion of 14q was regionally heterogeneous in 27%
and homogeneous in 2% of the grade I meningiomas, heterogeneous in 31% and
homogeneous in 62% of the grade II tumors, and heterogeneous in 40% and
homogeneous in 60% of the grade III meningiomas.
Distribution of cells with deletion of 22q was regionally heterogeneous in 15%
and homogeneous in 3% of the grade I tumors, heterogeneous in 15% and
homogeneous in 31% of grade II tumors, and homogeneous in 20% of the grade III
meningiomas.
Distribution of cells with trisomy 22q was regionally heterogeneous in 10% of
grade I tumors, heterogeneous in 23% of grade II, and homogeneous in 80% of
grade III meningiomas.
The proportion of patients with a deletion of 22q (either homogeneous or
heterogeneous) who had recurrence was greater than the proportion of those
without 22q deletion who had recurrence, and deletion of 22q was significantly
associated with radiologically detected recurrence (P < 0.05).
We conclude that the appearance of chromosomal aberrations in different areas of
the tumor demonstrates the importance of regional heterogeneity in the
biological behavior of meningiomas.
© 2003 Duke University Press
Source: http://lysander.ingentaselect.com/cgi-bin/linker?ini=dup_no&reqidx=/cw/dup/15228517/v6n4/s4/p290
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