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Published in: European Journal of Nuclear Medicine and Molecular Imaging 8/2022

03-12-2021 | Prostate Cancer | Original Article

Dual-tracer PET/CT-targeted, mpMRI-targeted, systematic biopsy, and combined biopsy for the diagnosis of prostate cancer: a pilot study

Authors: Dong-Xu Qiu, Jian Li, Jin-Wei Zhang, Min-Feng Chen, Xiao-Mei Gao, Yong-Xiang Tang, Ye Zhang, Xiao-Ping Yi, Hong-ling Yin, Yu Gan, Gui-Lin Wang, Xiong-Bing Zu, Shuo Hu, Yi Cai

Published in: European Journal of Nuclear Medicine and Molecular Imaging | Issue 8/2022

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Abstract

Purpose

Growing evidence proved the efficacy of multi-parametric MRI (mpMRI) and prostate-specific membrane antigen (PSMA) positron emission tomography/computed tomography (PET/CT)-guided targeted biopsy (TB) in prostate cancer (PCa) diagnosis, but there is no direct comparison between mpMRI-TB and PSMA PET/CT-TB. Gastrin-releasing peptide receptor (GRPR) is highly expressed in PCa, which can compensate for the unstable expression of PSMA in PCa. Therefore, we designed a study to compare the efficiency of mpMRI-TB, dual-tracer (GRPR and PSMA) PET/CT-TB, systematic biopsy, and combined biopsy for the diagnosis of prostate cancer.

Methods

One hundred twelve suspicious PCa patients were enrolled from September 2020 to June 2021. Patients with anyone of positive dual-tracer PET/CT or mpMRI underwent TB, and all enrolled patients underwent systematic biopsy (SB) after TB. The primary outcome was the detection rates of PCa in different biopsy strategies. Secondary outcomes were the performance of three imaging methods, omission diagnostic rates, and upgrading and downgrading of biopsy samples relative to those of prostatectomy specimens in different biopsy strategies. McNemar’s tests and Bonferroni correction in multiple comparisons were used to compare the primary and secondary outcomes.

Results

In 112 men, clinically significant PCa (grade group[GG] ≥ 2) accounted for 34.82% (39/112), and nonclinically significant PCa (GG = 1) accounted for 4.46% (5/112). 68 Ga-PSMA PET/CT-TB achieved higher PCa detection rate (69.77%) and positive ratio of biopsy cores (0.44) compared with SB (39.29% and 0.12) and mpMRI-TB (36.14% and 0.23), respectively (P < 0.005). Dual-tracer PET/CT screen out patients for avoiding 52.67% (59/112) unnecessary biopsy, whereas dual-tracer PET/CT-TB plus SB achieved high detection rate (77.36%) without misdiagnosis of csPCa.

Conclusion

Dual-tracer PET/CT might screen patients for avoiding unnecessary biopsy. Dual-tracer PET/CT-TB plus SB might be a more effective and promising strategy for the definite diagnosis of clinically significant PCa than mpMRI-TB.
Appendix
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Metadata
Title
Dual-tracer PET/CT-targeted, mpMRI-targeted, systematic biopsy, and combined biopsy for the diagnosis of prostate cancer: a pilot study
Authors
Dong-Xu Qiu
Jian Li
Jin-Wei Zhang
Min-Feng Chen
Xiao-Mei Gao
Yong-Xiang Tang
Ye Zhang
Xiao-Ping Yi
Hong-ling Yin
Yu Gan
Gui-Lin Wang
Xiong-Bing Zu
Shuo Hu
Yi Cai
Publication date
03-12-2021
Publisher
Springer Berlin Heidelberg
Published in
European Journal of Nuclear Medicine and Molecular Imaging / Issue 8/2022
Print ISSN: 1619-7070
Electronic ISSN: 1619-7089
DOI
https://doi.org/10.1007/s00259-021-05636-1

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