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Utility of SUVmax on Primary Staging 68Ga-PSMA PET/CT in Determining Metastatic Status of Prostate Cancer
Geoffrey Liu1,2, Shane Lee1,2, Kabir Ahmad1,2
1Barwon Medical Imaging, Barwon Health, Geelong, Australia.
Introduction:
68Ga prostate-specific membrane antigen (PSMA) has been shown to have prognostic value in detecting PSMA expressing metastasis from prostate cancer, but inevitably, there are cases in which suspected metastases demonstrate equivocal uptake. This study aims to assess whether there is a direct relationship between SUVmax of the primary prostate lesion and the presence of nodal and distant metastasis.
Methods:
Retrospective review of 265 primary staging 68Ga-PSMA PET/CT studies performed at a single centre on a single PET/CT was performed for the SUVmax of the primary lesion, and the presence of PSMA-avid nodal/distant metastases.
Results:
Analysis shows that a single unit increase in SUVmax of the primary prostatic lesion corresponds with a 1.6% increased odds of nodal metastases, 1.7% increased odds of distant metastases and a 2% increased odds of having either. A single unit increase in the log of the SUVmax corresponds with odds ratios of 2.061, 2.038 and 2.294 respectively.
Conclusion:
There is a weak but statistically significant correlation between the SUVmax of the primary prostate lesion and the presence of metastases on primary staging 68Ga-PSMA PET/CT for biopsy-proven prostate cancer. However, because the relationship is so weak and the significant overlap in SUVmax in local versus advanced disease, using SUVmax as the sole predictor of advanced disease is unreliable.
Insights
The maximum standardized uptake value (SUVmax) of primary prostate lesions shows a weak but significant link to metastasis detection using 68Ga-PSMA PET/CT. However, SUVmax alone is unreliable for predicting advanced prostate cancer due to significant overlap.
Area of Science:
- Nuclear Medicine
- Oncology
- Radiology
Background:
- 68Ga-PSMA PET/CT is valuable for detecting prostate cancer metastasis.
- Equivocal uptake in suspected metastases can occur, necessitating further prognostic indicators.
- The prognostic value of SUVmax in primary prostate lesions requires further investigation.
Purpose of the Study:
- To investigate the direct relationship between the SUVmax of primary prostate lesions and the presence of nodal and distant metastases.
- To determine if SUVmax can serve as a predictor for advanced prostate cancer staging.
Main Methods:
- Retrospective review of 265 primary staging 68Ga-PSMA PET/CT studies.
- Analysis of SUVmax of the primary prostate lesion.
- Assessment of the presence of PSMA-avid nodal and distant metastases.
Main Results:
- A single unit increase in primary lesion SUVmax correlated with a 1.6% increased odds of nodal metastases and 1.7% for distant metastases.
- Increased SUVmax of the primary lesion showed a 2% increased odds of any metastasis.
- Log SUVmax increases corresponded to odds ratios between 2.038 and 2.294 for metastasis.
Conclusions:
- A statistically significant, albeit weak, correlation exists between primary prostate SUVmax and metastasis detection on 68Ga-PSMA PET/CT.
- Significant overlap in SUVmax values between local and advanced disease limits its predictive capability.
- SUVmax of the primary lesion is unreliable as the sole predictor of advanced prostate cancer.
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