Abstract
Background
MRI treatment response assessment maps (TRAMs) were introduced to distinguish recurrent malignant glioma from therapy related changes. TRAMs are calculated with two contrast-enhanced T1-weighted sequences and reflect the “late” wash-out (or contrast clearance) and wash-in of gadolinium. Vital tumor cells are assumed to produce a wash-out because of their high turnover rate and the associated hypervascularization, whereas contrast medium slowly accumulates in scar tissue. To examine the real value of this method, we compared TRAMs with the pathology findings obtained after a second biopsy or surgery when recurrence was suspected.
Methods
We retrospectively evaluated TRAMs in adult patients with histologically demonstrated glioblastoma, contrast-enhancing tissue and a pre-operative MRI between January 1, 2017, and December 31, 2022. Only patients with a second biopsy or surgery were evaluated. Volumes of the residual tumor, contrast clearance and contrast accumulation before the second surgery were analyzed.
Results
Among 339 patients with mGBM who underwent MRI, we identified 29 repeated surgeries/biopsies in 27 patients 59 ± 12 (mean ± standard deviation) years of age. Twenty-eight biopsies were from patients with recurrent glioblastoma histology, and only one was from a patient with radiation necrosis. We volumetrically evaluated the 29 pre-surgery TRAMs. In recurrent glioblastoma, the ratio of wash-out volume to tumor volume was 36 ± 17% (range 1–73%), and the ratio of the wash-out volume to the sum of wash-out and wash-in volumes was 48 ± 21% (range 22–92%). For the one biopsy with radiation necrosis, the ratios were 42% and 54%, respectively.
Conclusions
Typical recurrent glioblastoma shows a > 20%ratio of the wash-out volume to the sum of wash-out and wash-in volumes. The one biopsy with radiation necrosis indicated that such necrosis can also produce high wash-out in individual cases. Nevertheless, the additional information provided by TRAMs increases the reliability of diagnosis.
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Data availability
The datasets used and analyzed in the current study are partially available on request. Because individual patient data were not published, individual patients cannot be identified.
Code availability
Not applicable.
Abbreviations
- MRI :
-
Magnetic resonance imaging
- MP-RAGE :
-
Magnetization prepared–rapid gradient echo
- MR :
-
Magnetic resonance
- SD :
-
Standard deviation
- TRAMs :
-
Treatment assessment maps
- WOR :
-
(Normalized) wash-out ratio
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All authors have reviewed and approved the submitted manuscript for publication. The authors agree to be accountable for all aspects of the work, and to ensure its integrity and accuracy. SM was the project administrator and organized the data curation, measurements, design, literature review, and writing of the manuscript. EK contributed to data collection, measurements and analysis. GG contributed to the conceptualization, literature review, and design of the study. OG and HH contributed to the formal analysis and literature review of the study, draft, review, and edited the manuscript.
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This study was ethically approved by the institutional review board Ethik-Kommission der Landesärztekammer Baden-Württemberg (Liebknechtstr. 33, D-70565 Stuttgart, Germany, No. F-2023–037) and adhered to the 2013 Declaration of Helsinki.
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Müller, S.J., Khadhraoui, E., Ganslandt, O. et al. MRI Treatment Response Assessment Maps (TRAMs) for differentiating recurrent glioblastoma from radiation necrosis. J Neurooncol 166, 513–521 (2024). https://doi.org/10.1007/s11060-024-04573-x
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DOI: https://doi.org/10.1007/s11060-024-04573-x