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„PSMA-radioguided surgery“ beim lokal begrenzten Prostatakarzinomrezidiv

Aktueller Stand und zukünftige Entwicklungen

PSMA-radioguided surgery in localized recurrent prostate cancer

Current and future aspects

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Zusammenfassung

Kürzlich wurde die „PSMA-radioguided-surgery“ (PSMA-RGS) zur gezielten Resektion beim lokalisierten Prostatakarzinomrezidiv eingeführt. Indiziert wird die PSMA-RGS durch eine 68Ga-PSMA-Positronen-Emissions-Tomographie (‑PET), die möglichst nur ein singuläres Weichteil- oder Lymphknotenrezidiv zeigt. Bei entsprechender Indikation wird nach Injektion von 111In-PSMA-I&T oder 99mTc-PSMA-I&S bei den Patienten routinemäßig eine Single-Photonenemissionscomputertomographie (SPECT)/Computertomographie (CT-)Untersuchung durchgeführt, um eine adäquate Radionuklidaufnahme in den Tumorläsionen zu überprüfen. Während in einer ersten Serie die 111In-PSMA I&T-SPECT/CT nur ca. die Hälfte der in der 68Ga-HBED-CC-PSMA-PET positive Läsionen nachweisen konnte, konnten mittels PSMA-RGS intraoperativ nicht nur annähernd alle PET-positiven Läsionen aufgespürt, sondern sogar fünf zusätzliche Läsionen im Vergleich zur 68Ga-HBED-CC-PSMA-PET gefunden werden. Im Follow-up von 55 Patienten zeigte sich bei 44 (80 %) resp. 29 (53 %) der Patienten ein prostataspezifischer Antigen(PSA)-Abfall von >50 % bzw. >90 %. Bei 34 (62 %) der Patienten wurde sogar ein PSA-Nadir <0,2 ng/ml erreicht. 15 (27 %) der Patienten erhielten eine weitere prostatakarzinomspezifische Therapie, die verbleibenden 40 (73 %) der Patienten erhielten keine weitere Therapie nach PSMA-RGS bei einem medianen Follow-up von 195 Tagen. Bei ca. 33 % der Patienten kam es nach PSMA-RGS zu postoperativen Komplikationen, welche jedoch überwiegend als geringgradig eingestuft wurden. Zusammenfassend zeigte sich die PSMA-RGS zur intraoperativen Detektion und Resektion der oft sehr kleinen metastatischen Läsionen als hilfreiche und praktikable Methode. Um gute onkologische Ergebnisse zu erzielen ist allerdings eine kritische Patientenauswahl, die sowohl klinische Parameter als auch die Ergebnisse der präoperativen 68Ga-PSMA-PET umfasst, von entscheidender Bedeutung.

Abstract

Recently, PSMA-radioguided surgery (PSMA-RGS) was introduced for targeted resection of localized prostate cancer recurrence. Prerequisite for preoperative patient selection and localization of tumor recurrence is a positive 68Ga-HBED-CC PSMA positron emission tomography (PET) scan with preferably only singular soft tissue or lymph node recurrence. After injection of In-PSMA I&T or Tc-PSMA-I&S single photon emission computer tomography (SPECT)/computer tomography (CT) examination is performed in every patient to verify radiotracer uptake in tumor lesions. In a preliminary study, 111In-PSMA I&T SPECT/CT could detect about half of the 68Ga-HBED-CC PSMA PET-positive lesions, while nearly all PET-positive lesions could be detected using PSMA-RGS and also five additional lesions compared to 68Ga-HBED-CC-PSMA PET. Follow-up data from 55 patients show a PSA reduction >50% and >90% in 44 (80%) and 29 (53%) patients, respectively. In 34 (62%) patients, a PSA drop to <0.2 ng/ml was observed. In all, 15 (27%) patients received further PC-specific treatment; the remaining 40 (73%) patients did not undergo further treatment. In 33% of patients, surgery-related complications were noted; however, most were regarded as minor. Thus, PSMA-RGS seems to be of high value in patients with localized prostate cancer recurrence with exact localization and resection of metastatic tissue. However, patient selection based on 68Ga-PSMA PET imaging and clinical parameters is crucial to obtain satisfactory oncological results.

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Abb. 1

Abbreviations

PSMA-RGS:

„PSMA-radioguided surgery“

PET:

Positronen-Emissions-Tomographie

SPECT:

Single‐Photonen‐Emissions‐Computertomographie

CT:

Computertomographie

MRT:

Magnetresonanztomographie

PSMA:

Prostataspezifisches Membranantigen

99mTc:

Technetium-99m

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Correspondence to T. Maurer.

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I. Rauscher, M. Eiber, C. A. Jilg, J. E. Gschwend und T. Maurer geben an, dass kein Interessenkonflikt besteht.

Dieser Beitrag beinhaltet keine von den Autoren durchgeführten Studien an Menschen oder Tieren.

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Rauscher, I., Eiber, M., Jilg, C.A. et al. „PSMA-radioguided surgery“ beim lokal begrenzten Prostatakarzinomrezidiv. Urologe 56, 18–23 (2017). https://doi.org/10.1007/s00120-016-0275-2

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