Published in:
01-10-2013 | Original Article
High 123I-MIBG uptake in neuroblastic tumours indicates unfavourable histopathology
Authors:
Wolfgang Peter Fendler, Henriette Ingrid Melzer, Christoph Walz, Dietrich von Schweinitz, Eva Coppenrath, Irene Schmid, Peter Bartenstein, Thomas Pfluger
Published in:
European Journal of Nuclear Medicine and Molecular Imaging
|
Issue 11/2013
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Abstract
Purpose
Scintigraphy using 123I-metaiodobenzylguanidine (123I-MIBG) is widely used for the detection of neuroblastic tumours. The aim of this study was to identify a possible correlation between the uptake intensity on 123I-MIBG SPECT and histopathology of neuroblastic tumours.
Methods
123I-MIBG SPECT examinations were performed in 55 paediatric patients with neuroblastic tumour and compared to histopathology after surgical resection or biopsy at a mean of 2 weeks after SPECT. For each lesion International Neuroblastoma Pathology Classification System (INPC) stage, mitosis karyorrhexis index (MKI), location and a semiquantitative tumour-to-liver count-rate ratio (TLCRR) were determined. Also, the presence or absence of MYCN amplification, p1 deletion, urine catecholamine and neuron-specific enolase blood levels at the time of scanning were recorded.
Results
In the 55 patients, 61 lesions were evaluated with 123I-MIBG SPECT and corresponding histopathological findings were reviewed (11 ganglioneuroma, 11 ganglioneuroblastoma and 39 neuroblastoma). TLCRR was significantly higher in the neuroblastoma group (mean TLCRR 2.7) than in the ganglioneuroblastoma group (mean TLCRR 1.0) and ganglioneuroma group (mean TLCRR 0.7) at the time of primary diagnosis (p < 0.001) and at follow-up (p = 0.039). Intense 123I-MIBG uptake was found in tumour tissue with a high mitotic activity (MKI-high or MKI-intermediate) after treatment. Four ganglioneuromas (36 %), three ganglioneuroblastomas (27 %) and six neuroblastomas (15 %) were 123I-MIBG-negative.
Conclusion
In paediatric patients with peripheral neuroblastic tumours, strong 123I-MIBG uptake indicates unfavourable histopathology. High uptake was seen in neuroblastomas and in tumours with a high mitotic activity.