| Autor: |
William T. Hrinivich, PhD, Ryan Phillips, MD, PhD, Angela J. Da Silva, PhD, Noura Radwan, MD, Michael A. Gorin, MD, Steven P. Rowe, MD, PhD, Kenneth J. Pienta, MD, Martin G. Pomper, MD, PhD, John Wong, PhD, Phuoc T. Tran, MD, PhD, Ken Kang-Hsin Wang, PhD |
| Jazyk: |
angličtina |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
Advances in Radiation Oncology, Vol 5, Iss 2, Pp 260-268 (2020) |
| Druh dokumentu: |
article |
| ISSN: |
2452-1094 |
| DOI: |
10.1016/j.adro.2019.10.006 |
| Popis: |
Purpose: Stereotactic ablative radiation therapy (SABR) for oligometastatic prostate cancer (OMPC) may improve clinical outcomes, but current challenges in intrafraction tracking of multiple small targets limits treatment accuracy. A biology-guided radiation therapy (BgRT) delivery system incorporating positron emission tomography (PET) detectors is being developed to use radiotracer uptake as a biologic fiducial for intrafraction tumor tracking to improve geometric accuracy. This study simulates prostate-specific membrane antigen (PSMA)-directed BgRT using a cohort from our phase II randomized trial of SABR in men with recurrent hormone sensitive OMPC and compares dose distributions to clinical SABR (CSABR). Methods and Materials: A research treatment planning system (RTPS) was used to replan 15 patients imaged with PSMA-targeted 18F-DCFPyL PET/computed tomography and previously treated with CSABR using conventional linear accelerators (linacs). The RTPS models a prototype ring-mounted linac incorporating PET and kilo-voltage computed tomography imaging subsystems and can be used to optimize BgRT plans, as well as research SABR (RSABR) plans, which use the prototype linac without radiotracer guidance. CSABR, RSABR, and BgRT plans were compared in terms of maximum planning target volume (PTV) dose (Dmax), mean dose to proximal organs at risk (DOAR), conformity index, as well as voxel-wise correlation of dose with PET specific uptake values to investigate possible dose-painting effects. Results: RSABR and BgRT plans resulted in mean ± standard deviation increases in Dmax of 4 ± 11% (P = .21) and 18 ± 15% (P < .001) and reductions in DOAR of –20 ± 19% (P |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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