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01-04-2024 | Astrocytoma | Case Study

Loss of methylthioadenosine phosphorylase immunoreactivity correlates with poor prognosis and elevated uptake of 11C-methionine in IDH-mutant astrocytoma

Authors: Toshihiro Yamamura, Kaoru Tamura, Daisuke Kobayashi, Motoki Inaji, Yuka Toyama, Hiroaki Wakimoto, Juri Kiyokawa, Shoko Hara, Yoji Tanaka, Tadashi Nariai, Kazuhide Shimizu, Kenji Ishii, Taketoshi Maehara

Published in: Journal of Neuro-Oncology

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Abstract

Purpose

The proximate localization of MTAP, which encodes methylthioadenosine phosphorylase, and CDKN2A/B on Chromosome 9q21 has allowed the loss of MTAP expression as a surrogate for homozygous deletion of CDKN2A/B. This study aimed to determine whether MTAP status correlates with clinical outcomes and 11C-methionine uptake in astrocytomas with IDH mutations.

Methods

We conducted immunohistochemistry for MTAP in 30 patients with astrocytoma, IDH-mutant who underwent 11C-methionine positron emission tomography scans prior to surgical resection. The tumor-to-normal (T/N) ratio of 11C-methionine uptake was calculated using the mean standardized uptake value (SUV) for tumor and normal brain tissues. Cox regression analysis was used for multivariate survival analysis.

Results

Among IDH-mutant astrocytomas, 26.7% (8/30) exhibited the loss of cytoplasmic MTAP expression, whereas 73.3% (22/30) tumors retained MTAP expression. The median progression-free survival (PFS) was significantly shorter in patients with MTAP loss than those with MTAP retention (1.88 years vs. 6.80 years, p = 0.003). The median overall survival (OS) was also shorter in patients with MTAP loss than in MTAP-retaining counterparts (5.23 years vs. 10.69 years, p = 0.019). Multivariate analysis identified MTAP status (hazard ratio (HR), 0.081) and extent of resection (HR, 0.104) as independent prognostic factors for PFS. Astrocytomas lacking cytoplasmic MTAP expression showed a significantly higher median T/N ratio for 11C-methionine uptake than tumors retaining MTAP (2.12 vs. 1.65, p = 0.012).

Conclusion

Our study revealed that the loss of MTAP expression correlates with poor prognosis and an elevated T/N ratio of 11C-methionine uptake in astrocytoma, IDH-mutant.
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Metadata
Title
Loss of methylthioadenosine phosphorylase immunoreactivity correlates with poor prognosis and elevated uptake of 11C-methionine in IDH-mutant astrocytoma
Authors
Toshihiro Yamamura
Kaoru Tamura
Daisuke Kobayashi
Motoki Inaji
Yuka Toyama
Hiroaki Wakimoto
Juri Kiyokawa
Shoko Hara
Yoji Tanaka
Tadashi Nariai
Kazuhide Shimizu
Kenji Ishii
Taketoshi Maehara
Publication date
01-04-2024
Publisher
Springer US
Published in
Journal of Neuro-Oncology
Print ISSN: 0167-594X
Electronic ISSN: 1573-7373
DOI
https://doi.org/10.1007/s11060-024-04661-y