PMPA for nephroprotection in PSMA-targeted radionuclide therapy of prostate cancer
Radioactive ligands for the prostate-specific membrane antigen (PSMA) are under development for therapy of metastasized prostate cancer. Since PSMA expression is also found in the kidneys, renal tracer uptake can be dose-limiting. Because kidney kinetics differ from tumor kinetics, serial applicatio...
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| Hauptverfasser: | , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
January 22, 2015
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| In: |
Journal of nuclear medicine
Year: 2015, Jahrgang: 56, Heft: 2, Pages: 293-298 |
| ISSN: | 2159-662X |
| DOI: | 10.2967/jnumed.114.147181 |
| Online-Zugang: | Verlag, kostenfrei, Volltext: http://dx.doi.org/10.2967/jnumed.114.147181 Verlag, kostenfrei, Volltext: http://jnm.snmjournals.org/content/56/2/293 
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| Verfasserangaben: | Clemens Kratochwil, Frederik L. Giesel, Karin Leotta, Matthias Eder, Torsten Hoppe-Tich, Hagop Youssoufian, Klaus Kopka, John W. Babich, and Uwe Haberkorn |
MARC
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| 520 | |a Radioactive ligands for the prostate-specific membrane antigen (PSMA) are under development for therapy of metastasized prostate cancer. Since PSMA expression is also found in the kidneys, renal tracer uptake can be dose-limiting. Because kidney kinetics differ from tumor kinetics, serial application of PSMA inhibitors such as 2-(phosphonomethyl)pentanedioic acid (PMPA) may improve the kidney-to-tumor ratio. In this study, we evaluated the effect of PMPA on the biodistribution of 2 promising PSMA ligands. Methods: Human prostate cancer xenografts (LNCaP) were transplanted subcutaneously into mice. After injection of 125I-MIP1095, a 16-h latency period was allowed for tracer clearance from the blood and renal calices. After baseline scintigraphy, PMPA was injected in doses of 0.2-50 mg/kg (n = 3 per dose, 5 controls), followed by scans at 2, 4, 6, and 24 h after PMPA injection. Kidney and tumor displacement was determined as a percentage of baseline. A shortened but similar design was used to evaluate the PSMA ligand MIP1404, which contains a chelate for 99mTc/rhenium. Results: PMPA injection 16 h after MIP1095 translated into a rapid and quantitative relevant displacement of renal activity. Tumor uptake was reduced to a significantly lesser extent in a dose-dependent manner. PMPA doses of 0.2-1 mg/kg appear optimal for sustaining nearly complete tumor uptake while simultaneously achieving near-total blocking of specific renal PSMA binding. The effect was successfully validated with the PSMA ligand MIP1404. Conclusion: PSMA-targeted radionuclide therapy can benefit from serial PMPA comedication by reducing off-target radiation to the kidneys. These data will be used for a first approximation in clinical translation, although in patients an optimization of the dose and time schedule may be necessary. | ||
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| 650 | 4 | |a PMPA | |
| 650 | 4 | |a prostate cancer | |
| 650 | 4 | |a PSMA | |
| 650 | 4 | |a radionuclide therapy | |
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