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2010 ; 33
(1
): 37-54
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Glioblastomas with oligodendroglial component - common origin of the different
histological parts and genetic subclassification
#MMPMID20966543
Klink B
; Schlingelhof B
; Klink M
; Stout-Weider K
; Patt S
; Schrock E
Anal Cell Pathol (Amst)
2010[]; 33
(1
): 37-54
PMID20966543
show ga
BACKGROUND: Glioblastomas are the most common and most malignant brain tumors in
adults. A small subgroup of glioblastomas contains areas with histological
features of oligodendroglial differentiation (GBMO). Our objective was to
genetically characterize the oligodendroglial and the astrocytic parts of GBMOs
and correlate morphologic and genetic features with clinical data. METHODS: The
oligodendroglial and the "classic" glioblastoma parts of 13 GBMO were analyzed
separately by interphase fluorescence in situ hybridization (FISH) on paraffin
sections using a custom probe set (regions 1p, 1q, 7q, 10q, 17p, 19q, cen18, 21q)
and by comparative genomic hybridization (CGH) of microdissected paraffin
embedded tumor tissue. RESULTS: We identified four distinct genetic subtypes in
13 GBMOs: an "astrocytic" subtype (9/13) characterized by +7/-10; an
"oligodendroglial" subtype with -1p/-19q (1/13); an "intermediate" subtype
showing +7/-1p (1/13), and an "other" subtype having none of the former
aberrations typical for gliomas (2/13). The different histological tumor parts of
GBMO revealed common genetic changes in all tumors and showed additional
aberrations specific for each part. CONCLUSION: Our findings demonstrate the
monoclonal origin of GBMO followed by the development of the astrocytic and
oligodendroglial components. The diagnostic determination of the genetic
signatures may allow for a better prognostication of the patients.