Peter R. Carroll, MD, MPH, presented “PSMA PET Imaging at Time of Diagnosis​” during the 31st International Prostate Cancer Update in July 2021 in Snowbird, Utah.

How to cite: Carroll, Peter R. “PSMA PET Imaging at Time of Diagnosis.” July 2021. Accessed Dec 2021. https://grandroundsinurology.com/psma-pet-imaging-at-time-of-diagnosis/

PSMA PET Imaging at Time of Diagnosis – Summary

Peter R. Carroll, MD, MPH, Professor of Prostate Cancer and Urology at the University of California, San Francisco, discusses PSMA PET imaging and compares it to conventional imaging at the time of diagnosis. He states that conventional imaging has insufficient sensitivity when staging men with high-risk localized prostate cancer at the time of diagnosis, therefore providing the rationale for using PSMA PET. Dr. Carroll then summarizes data demonstrating PSMA PET’s sensitivity. He begins with the OSPREY trial, which shows overall pelvic lymph node sensitivity of 40.3% and specificity of 97.9% for 18F-DCFPyL PSMA PET, and then looks at a meta-analysis of Gallium-68 PSMA-11 PET that found a sensitivity of 74% and specificity of 96%. He also cites a multicenter, two-arm, randomized study in Australia as proof of PSMA PET’s superiority to conventional imaging due to evidence of lower radiation exposure and higher specificity. Dr. Carroll discusses how PSMA PET impacts treatment planning, looking at a study on the impact of staging PSMA PET scans on radiation treatment plans that found major changes in 30% of patients and minor changes in 13-15%. He believes that the field is moving towards intraoperative imaging and outlines a study he is currently working on that is using an advanced firefly camera for intraoperative imaging and testing to see if the process will result in more therapeutic interventions. Dr. Carroll states that so far the study has been able to identify tumor fluorescence of all patients, has been very effective at identifying residual disease at surgical margins, and has had only one adverse effect: transitory green urine. He concludes that PSMA PET imaging is more sensitive than standard imaging and will soon replace conventional methods, although the impact on long-term outcomes remains to be determined. 

About The 31st Annual International Prostate Cancer Update:

The International Prostate Cancer Update (IPCU), founded in 1990, is a multi-day CME conference focused on prostate cancer treatment updates with expert, international faculty. It is led by expert physicians and is designed for urologists, medical oncologists, radiation oncologists, and other healthcare professionals involved in the diagnosis and treatment of prostate cancer. Dr. Carroll delivered this educational activity during the 31st iteration of the meeting in July 2021 in Snowbird, Utah.