Related Experiment Video
Updated: Jul 7, 2025
A Cognitive Fusion-guided Prostate Biopsy Using Multiparametric Magnetic Resonance Imaging and Transrectal Ultrasound
Published on: March 21, 2025
Comparison of Multiparametric MRI, [68Ga]Ga-PSMA-11 PET-CT, and Clinical Nomograms for Primary T and N Staging of
Omar Marek Tayara1, Kacper Pełka2,3, Jolanta Kunikowska2
1Second Department of Urology, Centre of Postgraduate Medical Education, 01-813 Warsaw, Poland.
Purpose Of The Report:
Although multiparametric magnetic resonance imaging (mpMRI) is commonly used for the primary staging of prostate cancer, it may miss non-enlarged metastatic lymph nodes. Positron emission tomography-computed tomography targeting the prostate-specific membrane antigen (PSMA PET-CT) is a promising method to detect non-enlarged metastatic lymph nodes, but more data are needed.
Materials And Methods:
In this single-center, prospective study, we enrolled patients with intermediate-to-high-risk prostate cancer scheduled for radical prostatectomy with pelvic node dissection. Before surgery, prostate imaging with mpMRI and PSMA PET-CT was used to assess lymph node involvement (LNI), extra-prostatic extension (EPE), and seminal vesicle involvement (SVI). Additionally, we used clinical nomograms to estimate the risk of these three outcomes.
Results:
Of the 74 patients included, 61 (82%) had high-risk prostate cancer, and the rest had intermediate-risk cancer. Histopathology revealed LNI in 20 (27%) patients, SVI in 26 (35%), and EPE in 52 (70%). PSMA PET-CT performed better than mpMRI at detecting LNI (area under the curve (AUC, 95% confidence interval): 0.779 (0.665-0.893) vs. 0.655 (0.529-0.780)), but mpMRI was better at detecting SVI (AUC: 0.775 (0.672-0.878) vs. 0.585 (0.473-0.698)). The MSKCC nomogram performed well at detecting both LNI (AUC: 0.799 (0.680-0.918)) and SVI (0.772 (0.659-0.885)). However, when the nomogram was used to derive binary diagnoses, decision curve analyses showed that the MSKCC nomogram provided less net benefit than mpMRI and PSMA PET-CT for detecting SVI and LNI, respectively.
Conclusions:
mpMRI and [68Ga]Ga-PSMA-11 PET-CT are complementary techniques to be used in conjunction for the primary T and N staging of prostate cancer.
Insights
Multiparametric MRI (mpMRI) and prostate-specific membrane antigen (PSMA) PET-CT are complementary for prostate cancer staging. Combining these imaging techniques improves the detection of lymph node and other cancer spread.
Area of Science:
- Oncology
- Radiology
- Nuclear Medicine
Background:
- Multiparametric magnetic resonance imaging (mpMRI) is standard for prostate cancer staging but may miss small metastatic lymph nodes.
- Prostate-specific membrane antigen positron emission tomography-computed tomography (PSMA PET-CT) shows promise for detecting non-enlarged metastatic lymph nodes, but requires further validation.
Purpose of the Study:
- To compare the diagnostic performance of mpMRI and PSMA PET-CT in detecting lymph node involvement (LNI), extra-prostatic extension (EPE), and seminal vesicle involvement (SVI) in patients with intermediate-to-high-risk prostate cancer.
- To evaluate the utility of clinical nomograms in conjunction with imaging for staging prostate cancer.
Main Methods:
- Prospective, single-center study of 74 patients with intermediate-to-high-risk prostate cancer undergoing radical prostatectomy.
- Pre-operative staging using mpMRI and PSMA PET-CT to assess LNI, EPE, and SVI.
- Comparison of imaging performance against histopathology and assessment using clinical nomograms (MSKCC).
Main Results:
- PSMA PET-CT demonstrated superior performance over mpMRI in detecting lymph node involvement (LNI).
- mpMRI showed better accuracy than PSMA PET-CT in detecting seminal vesicle involvement (SVI).
- While the MSKCC nomogram performed well, decision curve analysis indicated that mpMRI and PSMA PET-CT offered greater net benefit for detecting SVI and LNI, respectively.
Conclusions:
- Multiparametric MRI and [68Ga]Ga-PSMA-11 PET-CT are complementary imaging modalities.
- Concomitant use of mpMRI and PSMA PET-CT enhances primary T and N staging accuracy in prostate cancer.
Related Concept Videos
01:25Imaging Studies II: Positron Emission Tomography and Scintigraphy
Fundamental Principles of PET
01:29Positron Emission Tomography
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...