Zusammenfassung
Hintergrund
In den letzten Jahren hat die PSMA-Liganden-PET (PSMA: prostataspezifisches Membranantigen, PET: Positronen-Emissions-Tomographie) mit Tracern wie dem 68Ga-PSMA-11 vielversprechende Ergebnisse gezeigt und so zur Verbesserung der Versorgung von Prostatakarzinompatienten beigetragen.
Ziel
Im Folgenden wird die aktuelle Datenlage zur PSMA-Liganden-PET zusammengefasst, insbesondere auch im Hinblick auf den zunehmenden Ersatz von 68Ga-PSMA-Liganden durch 18F-markierte PSMA-Liganden.
Ergebnisse
Den häufigsten Einsatz findet die PSMA-Liganden-PET beim biochemischen Rezidiv. Hier zeigt die 68Ga-PSMA-11-PET/CT selbst bei niedrigen PSA-Werten im Vergleich zu konventionellen Bildgebungsmodalitäten hervorragende Detektionsraten, insbesondere auch bei kleinen, morphologisch unauffälligen Läsionen. Auch im primären Staging von Hochrisikopatienten, vor allem in Kombination mit der multiparametrischen MRT, gewinnt die 68Ga-PSMA PET zunehmend an Bedeutung. Insbesondere aufgrund logistischer Vorteile werden aktuell 68Ga-markierte PSMA-Liganden zunehmend durch 18F-markierte PSMA-Liganden, wie z. B. 18F-DCFPyL und 18F-PSMA-1007, ersetzt.
Schlussfolgerung
Der Einsatz der PSMA-Liganden-PET hat die PC-Bildgebung revolutioniert. Somit wird dieses Verfahren voraussichtlich in Zukunft eine noch größere Rolle in der Diagnostik des PC einnehmen, insbesondere, da nun 18F-markierte PSMA-Liganden zur Verfügung stehen. Allerdings ist eine simultane Bildanalyse von PET und CT sowie eine differenzierte Bildauswertung (klinischer Kontext, Kenntnis der gängigen Pitfalls) zwingend notwendig.
Abstract
Background
Recently, the use of prostate-specific membrane antigen (PSMA) tracers like 68Ga-PSMA-11 in positron emission tomography (PET) have shown promising results and are helping to improve care for patients with prostate cancer (PC).
Purpose
In the following we review the current literature on PSMA-ligand PET, in particular with regard to the currently increasing replacement of 68Ga-PSMA ligands by 18F-labeled PSMA ligands.
Results
PSMA-ligand PET is most frequently used for biochemical recurrence. Here, 68Ga-PSMA-11 PET/CT shows superior detection rates compared to conventional imaging modalities, especially in small, morphologically unsuspicious lesions, even at low PSA values. Furthermore, 68Ga-PSMA PET imaging seems to be an encouraging alternative for staging of high-risk patients, particularly in combination with multiparametric MRI.
Conclusion
The use of PSMA-ligand PET has revolutionized PC imaging. Thus, PSMA-ligand PET is expected to play an even greater role in PC diagnostics in the future, especially as 18F-labeled PSMA ligands are now increasingly used. However, simultaneous image analysis of PET and CT as well as a differentiated image evaluation (clinical context, knowledge of common pitfalls) is mandatory.
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M.-K. Chodyla, M. Eiber, A. Wetter und I. Rauscher geben an: Mit der Veröffentlichung des Artikels ist kein direkter oder indirekter wirtschaftlicher finanzieller Anreiz verbunden, und es wurde keine außerinstitutionelle Finanzierung erreicht. Alle Autoren versichern, dass keine Finanzierungsvereinbarung ihre Fähigkeit einschränkt, ihre Forschung/Studie angemessen zu vervollständigen und zu veröffentlichen, und dass sie die volle Kontrolle über Primärdaten hatten. Die Abbildungen wurden nicht anderweitig publiziert.
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Chodyla, MK., Eiber, M., Wetter, A. et al. Hybridbildgebung beim Prostatakarzinom. Radiologe 60, 386–393 (2020). https://doi.org/10.1007/s00117-020-00642-0
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DOI: https://doi.org/10.1007/s00117-020-00642-0
Schlüsselwörter
- Biochemisches Rezidiv
- Positronen-Emissions-Tomographie
- Prostatakarzinom
- Prostataspezifisches Membranantigen
- Salvage-Therapie