68Ga-PSMA-11 is a widely used radiotracer targeting PSMA. In this study, we investigated the diagnostic efficacy of 68Ga-PSMA-11 PET imaging (PET/CT or PET/MRI) in patients with newly diagnosed, treatment-naive prostate cancer, and performed a head-to-head comparison with multi-parameter magnetic resonance imaging (mpMRI).
Biopsy-confirmed adenocarcinoma of the prostate.
No anti-tumor treatment received prior to the PET imaging.
Subjects provide signed informed consent and confirm that they are able and willing to comply with all protocol requirements.
Radical prostatectomy scheduled within 28 days after PET imaging
Patients with other malignant tumors
Subjects with any medical condition or other circumstance that, in the opinion of the investigator, compromise obtaining reliable data, achieving study objectives, or completion.
Single group
68Ga-PSMA-11
DrugIntravenous injection of 68Ga-PSMA-11 with a dosage of 111-148 MBq (3-4 mCi), followed by PET/CT or PET/MRI acquisition according to standard methods.
Sensitivity of 68Ga-PSMA-11 Imaging to Detect Intraprostatic Tumors Relative to Histopathology in newly diagnosed, treatment-naive Prostate Cacner Participants
Using histopathology from radical prostatectomy as the reference standard, validate the true positive detection rate of PET for prostate lesions. Two experienced nuclear medicine physicians, blinded to all other imaging and clinical history of the patients, independently assessed the PET images. Any disagreements were resolved by consensus.
Specificity of 68Ga-PSMA-11 PET Imaging to Detect Intraprostatic Tumors Relative to Histopathology in newly diagnosed, treatment-naive Prostate Cacner Participants
Using histopathology from radical prostatectomy as the reference standard, validate the true negative detection rate of PET for prostate lesions. Two experienced nuclear medicine physicians, blinded to all other imaging and clinical history of the patients, independently assessed the PET images. Any disagreements were resolved by consensus.
Comparison of Detection Rates for Intraprostatic Tumors Between 68Ga-PSMA-11 PET Imaging and mpMRI
The number of intraprostatic lesions detected on imaging will be determined by each of independent readers. The sum of lesions per participant per tissue type and overall will be computed for each participant based on each reader's lesion count. This will be calculated from the 68Ga-PSMA-11 PET scan results as well as the mpMRI results.
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