Cited by 505Radiopharmaceutical Chemistry and ApplicationsProstate Cancer Diagnosis and TreatmentMedical Imaging Techniques and Applications

Targeted α-Therapy of Metastatic Castration-Resistant Prostate Cancer with 225Ac-PSMA-617: Dosimetry Estimate and Empiric Dose Finding

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Kratochwil, Clemens, Bruchertseifer, Frank, Rathke, Hendrik, Bronzel, Marcus, Apostolidis, Christos, Weichert, Wilko, Haberkorn, Uwe, Giesel, Frederik L. +1 more·2017·Journal of Nuclear Medicine

Abstract

The aim of this study was to develop a treatment protocol for 225Ac-PSMA-617 α-radiation therapy in advanced-stage, metastatic castration-resistant prostate cancer patients with prostate-specific membrane antigen (PSMA)–positive tumor phenotype. Methods: A dosimetry estimate was calculated on the basis of time–activity curves derived from serially obtained 177Lu-PSMA-617 scans extrapolated to the physical half-life of 225Ac, assuming instant decay of unstable daughter nuclides. Salvage therapies empirically conducted with 50 (n = 4), 100 (n = 4), 150 (n = 2), and 200 kBq/kg (n = 4) of 225Ac-PSMA-617 were evaluated retrospectively regarding toxicity and treatment response. Eight of 14 patients received further cycles in either 2- or 4-mo intervals with identical or deescalated activities. Results: Dosimetry estimates for 1 MBq of 225Ac-PSMA-617 assuming a relative biologic effectiveness of 5 revealed mean doses of 2.3 Sv for salivary glands, 0.7 Sv for kidneys, and 0.05 Sv for red marrow that are composed of 99.4% α, 0.5% β, and 0.1% photon radiation, respectively. In clinical application, severe xerostomia became the dose-limiting toxicity if treatment activity exceeded 100 kBq/kg per cycle. At 100 kBq/kg, the duration of prostate-specific antigen decline was less than 4 mo, but if therapy was repeated every 2 mo patients experienced additive antitumor effects. Treatment activities of 50 kBq/kg were without toxicity but induced insufficient antitumor response in these high-tumor-burden patients. Remarkable antitumor activity by means of objective radiologic response or tumor marker decline was observed in 9 of 11 evaluable patients. Conclusion: For advanced-stage patients, a treatment activity of 100 kBq/kg of 225Ac-PSMA-617 per cycle repeated every 8 wk presents a reasonable trade-off between toxicity and biochemical response.

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  1. Rubini G, Nicoletti A, Rubini D, Asabella AN. Radiometabolic treatment of bone- metastasizing cancer: from 186rhenium to 223radium. Cancer Biother Radio- pharm. 2014;29:1-11.

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Authors
Kratochwil, C., Bruchertseifer, F., Rathke, H., Bronzel, M., Apostolidis, C., Weichert, W., Haberkorn, U., Giesel, F. L., & Morgenstern, A.
Affiliations
  • University Hospital Heidelberg (DE)
  • European Commission (BE)
  • ABX-CRO Advanced Pharmaceutical Services (Germany) (DE)
  • Pathologisches Institut (DE)
  • German Cancer Research Center (DE)
Venue
Journal of Nuclear Medicine
Published
2017-04-13
Volume
58
Issue
10
Pages
1624-1631
ISSN
  • 0161-5505 (ISSN-L)
  • 2159-662X
OpenAlex
W2606187374
Cited by
505
References
31
Citations by year
2026: 35 · 2025: 60 · 2024: 48 · 2023: 36 · 2022: 53 · 2021: 83 · 2020: 57 · 2019: 61 · 2018: 57 · 2017: 14 · 2016: 1
FWCI
39.13
Type
journal article
Language
en
Open access
Locations
  • Journal of Nuclear Medicine (publishedVersion)
  • PubMed (publishedVersion)
  • mediaTUM – the media and publications repository of the Technical University Munich (Technical University Munich) (submittedVersion)
  • Joint Research Centre (European Commission) (submittedVersion)
Topics
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Radiopharmaceutical Chemistry and Applications
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Prostate Cancer Diagnosis and Treatment
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Medical Imaging Techniques and Applications
Keywords
metastatic castration-resistant prostate cancer, dosimetry, 177Lu-PSMA-617, xerostomia, salvage therapy, PSA response, treatment toxicity
MeSH terms
Actinium, Aged, Alpha Particles, Dipeptides, Heterocyclic Compounds, 1-Ring, Humans, Male, Middle Aged, Neoplasm Metastasis, Radiometry, Radiotherapy Dosage, Prostate-Specific Antigen, Prostatic Neoplasms, Castration-Resistant

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