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Initial multicentre experience of 68 gallium-PSMA PET/CT guided robot-assisted salvage lymphadenectomy: acceptable safety profile but oncological benefit appears limited

Abstract

OBJECTIVES: To evaluate the safety and short-term oncological outcomes of 68 gallium-labelled prostate-specific membrane antigen (68 Ga-PSMA) positron-emission tomography (PET)/computed tomography (CT)-directed robot-assisted salvage node dissection (RASND) for prostate cancer oligometastatic nodal recurrence. MATERIALS AND METHODS: Between February 2014 and April 2016, 35 patients across two centres underwent RASND for 68 Ga-PSMA PET/CT-detected oligometastatic nodal recurrence. RASND was performed using targeted pelvic dissection, unilateral extended pelvic template or bilateral extended pelvic template dissection, depending on previous pelvic treatment and extent/location of nodal disease. Complications were reported using the Clavien-Dindo classification system. Definitions of prostate-specific antigen (PSA) treatment response to RASND were defined as 6-week PSA <0.2 ng/mL (broad definition) or PSA <0.05 ng/mL (strict definition) in those who had undergone primary prostatectomy, and 6-week PSA level < post-radiotherapy nadir in those who had undergone primary radiotherapy. Biochemical recurrence (BCR) after RASND was defined as a PSA >0.2 ng/mL or PSA > nadir, for those who had undergone primary prostatectomy and primary radiotherapy, respectively. Predictors of treatment response were analysed using univariate binary logistic regression. RESULTS: A total of 58 lesions suspicious for lymph node metastases (LNM) in 35 patients were detected on 68 Ga-PSMA imaging. A total of 32 patients (91%) had histopathologically proven LNM at RASND, with a total of 87 LNM and a median (interquartile range) of 2 (1-3) LNM per patient. In all, eight patients (23%) experienced complications, all Clavien-Dindo grade </=2. Treatment response was seen in 15 (43%) and 11 patients (31%), using the broad and strict definitions, respectively. BCR-free survival and clinical recurrence-free survival at a median follow-up of 12 months were 23% and 66%, respectively, for the entire cohort. Bilateral template dissection was the only significant univariate predictor of treatment response in our cohort. CONCLUSIONS: Although RASND appears safe and feasible, less than half of our cohort had a treatment response, and less than a quarter experienced BCR-free survival at 12-month median follow-up. 68 Ga-PSMA imaging underestimates micro-metastatic disease, therefore RASND will rarely be curative. Strict patient selection and restricting RASND to clinical trials is recommended. Long-term follow-up from such trials is required to further assess potential quality of life and mortality benefits.

Type Journal
ISBN 1464-410X (Electronic) 1464-4096 (Linking)
Authors Siriwardana, A.; Thompson, J.; van Leeuwen, P. J.; Doig, S.; Kalsbeek, A.; Emmett, L.; Delprado, W.; Wong, D.; Samaratunga, H.; Haynes, A. M.; Coughlin, G.; Stricker, P.
Responsible Garvan Author Anne-Maree Haynes
Publisher Name BJU INTERNATIONAL
Published Date 2017-11-14
Published Volume 120
Published Issue 5
Published Pages 673-681
Status Published in-print
DOI 10.1111/bju.13919
URL link to publisher's version https://www.ncbi.nlm.nih.gov/pubmed/28548372