TITLE

3-[[sup 123] I]Iodo-α-methyl-L-tyrosine uptake in cerebral gliomas: relationship to histological grading and prognosis

AUTHOR(S)
Schmidt, Daniela; Gottwald, Ullrich; Langen, Karl-Josef; Weber, Friedrich; Hertel, Anja; Floeth, Frank; Felsberg, Jörg; Reifenberger, Guido; Coenen, Heinz H.; Müller-Gärtner, Hans-Wilhelm
PUB. DATE
July 2001
SOURCE
European Journal of Nuclear Medicine;2001, Vol. 28 Issue 7, p855
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
3-[[sup 123] I]Iodo-α-methyl-L-tyrosine (IMT) is employed clinically as a tracer of amino acid transport in brain tumours using single-photon emission tomography (SPET). This study investigates the role of IMT SPET in the non-invasive histological grading and prognostic evaluation of cerebral gliomas. The files of patients investigated by IMT SPET in our clinic between 1988 and 1996 were evaluated retrospectively. Complete follow-up was available for 58 patients with cerebral gliomas investigated by IMT SPET shortly after tumour diagnosis. Seventeen patients had low-grade gliomas (WHO grade II), 14 had anaplastic gliomas (WHO grade III) and 27 had glioblastomas (WHO grade IV). Thirty-six cases were primary tumours and 22 cases, recurrences. Maximal and mean tumour-to-brain (T/B) ratios of IMT uptake at the first IMT SPET investigation were related to histological grading and survival time. Patients with low-grade gliomas showed significantly longer survival than patients with high-grade (grade III or IV) tumours. Gliomas without contrast enhancement on computed tomography or magnetic resonance imaging scans were associated with longer patient survival than tumours with contrast enhancement. The T/B ratios of IMT SPET showed no differences in relation to histological grading [WHO grade II: 1.73±0.59; WHO grade III: 1.74±0.38; WHO grade IV: 1.59±0.35, (mean±SD, T/B ratios of mean tumour uptake)]. The median survival time of patients with a high T/B ratio on IMT SPET was not significantly different from that of patients with a low T/B ratio (T/B ratio <1.6, 14.8 months; T/B ratio ≥1.6, 13.0 months). Thus, no evidence could be found for a relationship between IMT uptake in cerebral gliomas and either histological grading or survival time. Nevertheless, IMT SPET constitutes a useful method for the detection of primary and recurrent gliomas, determination of tumour extent and individual follow-up.
ACCESSION #
5350693

 

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