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Immediate post-radiotherapy changes in malignant glioma can mimic tumor progression
M C Y de Wit1, H G de Bruin, W Eijkenboom
1Department of Neuro-oncology/Neurology, Daniel den Hoed Cancer Center/Erasmus Medical Center, Rotterdam, The Netherlands.
Neurology
|August 12, 2004
Summary
Progressive MRI lesions after glioma radiotherapy can spontaneously improve. Patients with these early progressive lesions should not be enrolled in recurrent glioma trials.
Area of Science:
- Neuro-oncology
- Radiotherapy
- Neuroimaging
Background:
- Glioma patients often undergo radiotherapy.
- Assessing treatment response with MRI is crucial.
- Distinguishing true recurrence from post-treatment changes is challenging.
Observation:
- A cohort of 32 patients treated with radiotherapy only was studied.
- The first post-radiotherapy MRI was evaluated for progressive lesions.
- Spontaneous improvement or stabilization was monitored.
Findings:
- Progressive enhancement was observed in 9 out of 32 patients within 3 months post-radiotherapy.
- In 3 of these 9 patients, MRI findings improved or stabilized for 6 months without further intervention.
- This suggests a subset of early progressive lesions are not true recurrences.
Implications:
- Early progressive MRI lesions after glioma radiotherapy may not indicate tumor recurrence.
- Patients exhibiting such lesions within 3 months should be carefully evaluated before trial enrollment.
- This finding could refine eligibility criteria for clinical trials in recurrent glioma.