Comparison of 68Ga-PSMA-11 PET/CT with 11C-acetate PET/CT in re-staging of prostate cancer relapse

Positron emission tomography (PET) imaging is used to localize recurrent disease in prostate cancer (PCa). The tracer 68 Ga-PSMA-11 visualizes lesions overexpressing prostate-specific membrane antigen (PSMA), while 11 C-acetate visualizes lesions with increased anabolic metabolism. The aim of this s...

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Veröffentlicht in:Scientific reports 2020-03, Vol.10 (1), p.4993-4993, Article 4993
Hauptverfasser: Regula, Naresh, Kostaras, Vasileios, Johansson, Silvia, Trampal, Carlos, Lindström, Elin, Lubberink, Mark, Velikyan, Irina, Sörensen, Jens
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Sprache:eng
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Zusammenfassung:Positron emission tomography (PET) imaging is used to localize recurrent disease in prostate cancer (PCa). The tracer 68 Ga-PSMA-11 visualizes lesions overexpressing prostate-specific membrane antigen (PSMA), while 11 C-acetate visualizes lesions with increased anabolic metabolism. The aim of this study was to compare the performance of PSMA-PET and acetate-PET in re-staging patients with biochemical relapse. Thirty PCa patients with prostate-specific antigen (PSA) relapse after primary curative therapy were prospectively evaluated. PET/CT examinations using 11 C-acetate and 68 Ga-PSMA-11 were performed. Identified lesions were categorized according to anatomical location and PET measurements were correlated with PSA at time of scan. Tumour lesions showed higher semi-quantitative uptake values on PSMA-PET than acetate-PET. PSMA-PET identified more lesions in 11 patients, fewer lesions in eight patients, and identical number of lesions in 11 patients. This study indicates better diagnostic performance of PSMA-PET, particularly in detecting lymph node (81% vs 60%, p = 0.02) and bone metastasis (95% vs 61%, p = 0.0001) compared to acetate-PET. However, 38% of PSMA-expressing metastases appear to be metabolically inactive and 15% of metabolically active metastases lack PSMA expression. Addition of PET with a metabolic tracer, such as 11 C-acetate, might be beneficial before making treatment decisions.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-020-61910-6