Dose painting by numbers based on retrospectively determined recurrence probabilities
Eric Grönlund1, Silvia Johansson2, Anders Montelius3
1Medical Radiation Sciences, Department of Immunology, Genetics and Pathology, Uppsala University, Sweden.
This study developed "dose painting by numbers" for head and neck cancer radiotherapy using FDG-PET scans. This method optimizes radiation dose, significantly increasing tumor control probability, especially for larger tumors.
Area of Science:
- Radiation Oncology
- Medical Imaging
- Cancer Treatment
Background:
- Conventional radiotherapy for head and neck squamous cell carcinoma (HNSCC) has limitations in optimizing tumor control.
- "Dose painting by numbers" offers a strategy to personalize radiation dose based on tumor characteristics.
Purpose of the Study:
- To derive "dose painting by numbers" prescriptions from retrospective recurrence data in HNSCC patients.
- To investigate the relationship between recurrence volumes and pre-treatment FDG-PET standardized uptake values (SUV).
Main Methods:
- Determined spatial correlation between recurrence volumes and pre-treatment FDG-PET SUV.
- Derived SUV-driven dose-response functions to optimize dose redistribution.
- Implemented functions into a treatment planning system for realistic dose optimization.
Main Results:
- Calculated tumor control probabilities (TCP) increased by 0.1-14.6% with optimized dose redistribution.
- Greater TCP increases were observed in patients with larger and more heterogeneous tumors.
Conclusions:
- Dose painting prescriptions can be derived from FDG-PET imaging and recurrence volumes.
- Optimized dose redistribution significantly improves TCP for large, heterogeneous HNSCC tumors.
- Results support prospective studies for clinical validation of dose painting in HNSCC.
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