Abstract
Oligoprogression is defined as limited metastatic clone resistant to on-going systemic treatment that grows in a background of stable or responding systemic disease. Aim of the present study was to analyze oligoprogressive prostate cancer (PC) patients treated with stereotactic body radiation therapy (SBRT) during systemic treatment to identify predictive factors and improve patients’ selection. We included PC patients treated with SBRT on a maximum of 3 sites of oligoprogression during systemic therapy. Endpoints were freedom from polymetastatic progression (FPP), local control (LC), distant progression free survival (DPFS), overall survival (OS), and next systemic therapy free survival (NEST-FS). Fifty-three patients were treated on 85 oligoprogressive metastases. Lymph nodes were the most common sites (56.47%), followed by bone (39.29%). Median follow-up was 24.9 months. Rates of FPP at 1- and 2-year were 80.1% and 68.9%, respectively. Median time to polymetastatic progression was 33.7 months. Disease free interval (p = 0.004), site of metastases (p = 0.011), and type of systemic therapy (p = 0.003) were significant for FPP. Switch or intensification of systemic therapy after SBRT was observed in 29 (54.72%) patients with a median NEST-FS of 15.2 months. LC at 1- and 2-year was 94.0% and 92.0%, with PSA doubling time resulted to be significantly associated (p = 0.047). Median DPFS was 8.93 months and median OS was 50.6 months. In conclusion, we confirmed the efficacy of SBRT for oligoprogression from PC, with the potential to prolong the on-going systemic therapy and interrupt the metastatic cascade.
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Data availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- PC:
-
Prostate cancer
- ADT:
-
Androgen deprivation therapy
- ARTA:
-
Androgen recepto targeted agents
- MDT:
-
Metastases-directed therapies
- SBRT:
-
Stereotactic body radiation therapy
- LC:
-
Local control
- PET:
-
Positron emitting tomography
- PSMA:
-
Prostate-specific membrane antigen
- CTV:
-
Clinical target volume
- GTV:
-
Gross target volume
- PTV:
-
Planning target volume
- FPP:
-
Freedom from polymetastatic progression
- DPFS:
-
Distant progression free survival
- OS:
-
Overall survival
- NEST-FS:
-
Next systemic therapy free survival
- Gy:
-
Gray
- BED:
-
Biological effective dose
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Franzese, C., Perrino, M., Marzo, M.A. et al. Oligoprogressive castration-resistant prostate cancer treated with metastases-directed stereotactic body radiation therapy: predictive factors for patients’ selection. Clin Exp Metastasis 39, 449–457 (2022). https://doi.org/10.1007/s10585-022-10158-7
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DOI: https://doi.org/10.1007/s10585-022-10158-7