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Oligoprogressive castration-resistant prostate cancer treated with metastases-directed stereotactic body radiation therapy: predictive factors for patients’ selection

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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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Correspondence to Ciro Franzese.

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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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