The value of 18F-PSMA-1007 PET/CT in identifying non-metastatic high-risk prostate cancer

Jun-Jie Hong; Bo-le Liu; Zhi-Qiang Wang; Kun Tang; Xiao-Wei Ji; Wei-Wei Yin; Jie Lin; Xiang-Wu Zheng

doi:10.1186/s13550-020-00730-1

The value of ¹⁸F-PSMA-1007 PET/CT in identifying non-metastatic high-risk prostate cancer

EJNMMI Res. 2020 Nov 10;10(1):138. doi: 10.1186/s13550-020-00730-1.

Authors

Jun-Jie Hong¹, Bo-le Liu¹, Zhi-Qiang Wang¹, Kun Tang¹, Xiao-Wei Ji¹, Wei-Wei Yin¹, Jie Lin¹, Xiang-Wu Zheng²

Affiliations

¹ Department of PET/CT, Radiology Imaging Center, The First Affiliated Hospital of Wenzhou Medical University, Xuefu North Rd, Wenzhou, 325000, Zhejiang, People's Republic of China.
² Department of PET/CT, Radiology Imaging Center, The First Affiliated Hospital of Wenzhou Medical University, Xuefu North Rd, Wenzhou, 325000, Zhejiang, People's Republic of China. zxwu111@sina.com.

Abstract

Background: Clinical management decisions on prostate cancer (PCa) are often based on a determination of risk. ⁶⁸Ga-prostate-specific membrane antigen (PSMA)-11-positron emission tomography (PET)/computer tomography (CT) is an attractive modality to assess biochemical recurrence of PCa, detect metastatic disease and stage of primary PCa, making it a promising strategy for risk stratification. However, due to some limitation of ⁶⁸Ga-PSMA-11 the development of alternative tracers is of high interest. In this study, we aimed to investigate the value of ¹⁸F-PSMA-1007 in identifying non-metastatic high-risk PCa.

Methods: A total of 101 patients with primary non-metastatic PCa who underwent ¹⁸F-PSMA-1007 PET/CT were retrospectively analyzed. According to the European Association of Urology guidelines on PCa, patients were classified into intermediate-risk (IR) group or high-risk (HR) group. The maximum standardized uptake values (SUVmax) of the primary prostate tumor were measured on PET/CT images. The diagnostic performance of PET/CT for IR and HR PCa was calculated, and the relationship between the SUVmax of primary prostate tumor, prostate-specific antigen (PSA) level and Gleason score (GS) was analyzed.

Results: Of all 101 patients, 49 patients were classified into IR group and 52 patients were classified into HR group. There was a significant positive correlation between PSA level/GS and SUVmax (r = 0.561, r = 0.496, P < 0.001, respectively). Tumors with GS 6 and 7a showed significantly lower ¹⁸F-PSMA-1007 uptake compared to patients with GS 8 and 9 (P < 0.01). SUVmax in patients of HR was significantly higher than those of IR (median SUVmax: 16.85 vs 7.80; P < 0.001). In receiver operating characteristic curve analysis, the optimal cutoff value of the SUVmax for identifying high-risk PCa was set as 9.05 (area under the curve: 0.829; sensitivity: 90.4%; specificity: 65.3%).

Conclusion: ¹⁸F-PSMA-1007 PET/CT showed the powerful diagnosis efficacy for high-risk PCa, which can be used as an objective imaging reference index for clinical reference.

Keywords: 18F-PSMA-1007; High risk; Prostate cancer.