Assessment of response of brain metastases to radiotherapy by PET imaging of apoptosis with 18 F-ML-10
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Early assessment of tumor response to therapy is vital for treatment optimization for the individual cancer patient. Induction of apoptosis is an early and nearly universal effect of anticancer therapies. The purpose of this study was to assess the performance of 18F-ML-10, a novel PET radiotracer for apoptosis, as a tool for the early detection of response of brain metastases to whole-brain radiation therapy (WBRT).
Materials and methods
Ten patients with brain metastases treated with WBRT at 30 Gy in ten daily fractions were enrolled in this trial. Each patient underwent two 18F-ML-10 PET scans, one prior to the radiation therapy (baseline scan), and the second after nine or ten fractions of radiotherapy (follow-up scan). MRI was performed at 6–8 weeks following completion of the radiation therapy. Early treatment-induced changes in tumor 18F-ML-10 uptake on the PET scan were measured by voxel-based analysis, and were then evaluated by correlation analysis as predictors of the extent of later changes in tumor anatomical dimensions as seen on MRI scans 6–8 weeks after completion of therapy.
In all ten patients, all brain lesions were detected by both MRI and the 18F-ML-10 PET scan. A highly significant correlation was found between early changes on the 18F-ML-10 scan and later changes in tumor anatomical dimensions (r = 0.9).
These results support the potential of 18F-ML-10 PET as a novel tool for the early detection of response of brain metastases to WBRT.
- Assessment of response of brain metastases to radiotherapy by PET imaging of apoptosis with 18F-ML-10
European Journal of Nuclear Medicine and Molecular Imaging
Volume 39, Issue 9 , pp 1400-1408
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- Positron emission tomography
- Response assessment
- Whole-brain radiation therapy
- Brain metastases
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- Author Affiliations
- 1. Department of Radiation Oncology, Nuclear Medicine, Radiology and Neurology, Rabin Medical Center, Petach-Tikvah, Israel
- 2. Sackler School of Medicine, Tel Aviv University, Tel-Aviv, Israel
- 4. Department of Oncology, Radiotherapy Unit Davvidoff Center, Rabin Medical Center, Petach-Tikvah, Israel
- 3. Aposense Ltd., Petach-Tikvah, Israel