DOI: 10.1007/s00259-017-3877-zPages: 1-4

Delayed response after repeated 177Lu-PSMA-617 radioligand therapy in patients with metastatic castration resistant prostate cancer

1. University Hospital Muenster, Department of Nuclear Medicine

2. University Hospital Muenster, Department of Urology

3. University Hospital Bonn, Department of Nuclear Medicine

4. University Hospital Muenster, Institute for Biostatistics

Correspondence to:
Kambiz Rahbar
Tel: +49-251-8347362
Email: rahbar@uni-muenster.de

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Abstract

Purpose

Radioligand therapy (RLT) using Lutetium-177 labeled PSMA-617 (Lu-PSMA) ligand is a new therapeutic option for salvage therapy in heavily pretreated patients with metastatic castration resistant prostate cancer. The aim of this retrospective study was to analyze response in patients receiving 3 cycles of Lu-PSMA.

Methods

Seventy-one patients (median age: 72 years; range 44–87) received 3 cycles of RLT with Lu-PSMA (mean administered activity: 6.016 ± 0.543 GBq) every 8 weeks. Response was evaluated using serum PSA levels and a PSA decline ≥50% was considered as biochemical response. Additionally, any PSA decline after the first cycle was evaluated for further therapy effects after the second and third cycle.

Results

A total of 213 cycles were performed in 71 patients. Data for response and adverse events were available for all patients. A PSA decline ≥50% and some PSA decline occurred in 56% and 66% of the patients. Of 30 patients with a PSA response after the first cycle, 28 remained responders and 12/41 of non-responders responded to further therapy cycles.

Conclusion

RLT with Lu-177-PSMA-617 shows respectable response rates. In this retrospective analysis, a relevant number of patients showed a delayed response, even if they did not respond to the first cycle of the therapy.

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  • Accepted: Nov 3, 2017
  • Online: Nov 13, 2017

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