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Rigo, Michele; Mazzola, Rosario; Napoli, Giuseppe; Giaj-Levra, Niccolò; Figlia, Vanessa; Nicosia, Luca; Ricchetti, Francesco; Tomasini, Davide; Bonù, Marco Lorenzo; Cuccia, Francesco; Bellorofonte, Carlo; Alongi, Filippo
Radiologia medica, 05/2020, Volume: 125, Issue: 5Journal Article
Purpose To evaluate tolerance and biochemical control rates of salvage external beam radiotherapy (EBRT) in patients with local relapse from prostate cancer (PC) after high-intensity focused ultrasound (HIFU) as primary treatment. Methods Twenty-four patients presented biochemical failure of PC. Salvage EBRT to the residual prostate was performed with moderate hypofractionation schedule (MHRT) in 28 fractions ( n = 16) or with extreme hypofractionation schedule (SBRT) in 5 fractions ( n = 8) by means of image-guided volumetric modulation arc therapy. In case of MHRT, the median dose was 71.4 Gy, whereas in case of SBRT it was 32.5 Gy. Results The median follow-up was 28 months. The median PSA nadir was 0.26 ng/mL. In case of MHRT, the median PSA nadir was 0.15 ng/mL and occurred within a median time of 19 months. In case of SBRT, the median PSA nadir was 0.64 ng/mL and occurred within a median time of 8 months. No G3 higher acute or late toxicity after EBRT was observed. Only three patients presented with G2 acute GI toxicity (actinic proctitis). Twelve patients experienced acute G1 GU toxicity: 8/16 of men treated with MHRT and 4/8 of men treated with SBRT. Complete local control of disease was achieved in 23/24 patients (96%). Conclusions Our data confirm the feasibility and the low toxicity of salvage EBRT with both schedules of treatment after HIFU failure. The findings of low acute toxicity and good biochemical control rates are encouraging, but a larger number of patients and a longer follow-up are needed to confirm these results.
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