Abstract
Background
M1a disease represents an intermediate status between loco-regional relapse and bone metastatic disease. Metastasis directed therapy (MDT), through stereotactic body RT (SBRT) may be offered to patients, aiming to exclusively treat sites of macroscopic relapse and avoiding wide prophylactic treatment volumes. This appears as a viable treatment, especially after the rise of PSMA tailored treatment approaches.
Materials and methods
Data about patients treated in two different institutions were retrieved from a prospectively collected dataset. All included patients were affected by oligo-recurrent M1a disease after definitive RT or radical prostatectomy, defined as ≤ 3 nodal lesions situated above aortic bifurcation and below renal arteries. Both castration resistant PCa (CRPC) and castration sensitive (CSPC) PCa patients were included. All imaging methods were allowed to detect recurrence (CT scan, Choline or PSMA PET/CT).All sites of recurrences were treated with SBRT.
Results
Median PFS was 10 months (95% CI 8–17). Twelve patients died, with a median OS of 114 months (95% CI 85–114). Out of the 83 recurrences, 2 (2.4%), 11 (13.25%), 36 (43.37%) and 15 (18%) patients had respectively prostate bed only, pelvic nodal, para-aortic or distant relapse. Furthermore, 19 (22.9%) patients experienced a biochemical only relapse with negative imaging at re-staging.
Discussion
MDT conferred a remarkable PFS outcome in a mixed cohort of CSPC and CRPC patients with m1a disease, with an optimal safety profile. Prospective trials are needed in order to compare MDT and ENRT for these patients, allowing to select the best treatment option.
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Acknowledgements
We hereby would like to thank Fondazione Radioterapia Oncologica (FRO) and all those that have provided a key support to scientific researches. We would also like to thank all the companies that through their unconditional and spontaneous donation contributed to the actual implementation of scientific research and to our studies. More specifically we would like to deeply thank Conad, Fondazione Cassa di Risparmio di Pistoia e Pescia, Fabiani, Rinascente, Giorgio Tesi Group, IFCA, Permira.
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Francolini, G., Garlatti, P., Di Cataldo, V. et al. Pattern of recurrence after stereotactic body radiotherapy for para-aortic oligo-recurrent prostate cancer, a multicentric analysis. Radiol med 128, 1423–1428 (2023). https://doi.org/10.1007/s11547-023-01701-x
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DOI: https://doi.org/10.1007/s11547-023-01701-x