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In recurrent prostate cancer, PSMA PET/CT changes management in two-thirds of cases

July 13, 2020

New research confirms the high impact of PSMA PET/CT in the detection and management of recurrent disease in prostate cancer patients. In initial results from a multicenter trial assessing the impact of 18F-DCFPyL prostate-specific membrane antigen positron emission tomography/computed tomography (PSMA PET/CT), a PET-directed change in management was observed in two-thirds of patients. The research was presented at the Society of Nuclear Medicine and Molecular Imaging's 2020 Virtual Annual Meeting.

Prostate cancer is the second most common cancer in men in the United States. According to the American Cancer Society, an estimated one in nine men will receive a prostate cancer diagnosis in his lifetime, and more than 191,000 men will be diagnosed with prostate cancer this year. Approximately 30 to 40 percent of men experience a biochemical recurrence of prostate cancer in which their prostate-specific antigen (PSA) levels rise after initial treatment.

DCFPyL (PSMA) PET/CT has been shown to be effective in diagnosing patients with prostate cancer. To assess its impact on the management of patients with suspected limited recurrent prostate cancer after primary therapy, researchers conducted a prospective, large-scale multicenter trial. The study included 410 men who had biochemical failure after primary therapy, had either no or limited disease on conventional imaging (CT and bone scintigraphy), and had undergone one of several prostate cancer treatments.

PSMA PET/CT identified disease in more than half of the men in whom CT and bone scan scintigraphy was negative. Additional sites of disease were observed in nearly two-thirds of patients in whom limited metastases were detected prior to PET. PSMA PET-directed management changes were recorded in 66 percent of the patients. The most common changes were conversion from observation or systemic therapy to surgery or radiation, or the addition of nodal-directed therapy to salvage surgery or radiation.

"The identification of extent of recurrence and specific sites of recurrence is crucial in determining the most appropriate mode of therapy for these men," noted Ur Metser, MD, professor of radiology at the University of Toronto in Ontario, Canada. "Findings from this study add to the body of evidence on the utility of PSMA PET in the management of prostate cancer patients."

He continued, "At this time, PSMA PET remains investigational in North American jurisdictions. Evidence generated from this study will help in seeking regulatory approvals to make molecular imaging with 18F-DCFPyL widely available and will pave the way for clinical studies that incorporate PSMA PET as a treatment planning tool to assess ultimate impact on patient outcomes."
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Abstract 40. "Preliminary results of a prospective, multicenter trial assessing the impact of 18F-DCFPyL-PET/CT on the management of patients with recurrent prostate cancer," Ur Metser, Joint Department of Medical Imaging, University of Toronto, Toronto, Ontario, Canada; Katherine Zukotynski, McMaster University, Ancaster, Ontario, Canada; Wei Liu, Oncology Western University, London, Ontario, Canada; Deanna Langer, Cancer Care Ontario, Toronto, Ontario, Canada; Pamela MacCrostie, Cancer Imaging Program, Cancer Care Ontario, Toronto, Ontario, Canada; L.K. Joseph Chin, Division of Urology, Department of Surgery Western University, London, Ontario, Canada; Antonio Finelli and Laurence H. Klotz, Division of Urology, Department of Surgery, University of Toronto, Toronto, Ontario, Canada; Anil Kapoor, Division of Urology, Department of Surgery, McMaster University, Hamilton, Ontario, Canada; Luke T. LaVallee, Division of Urology, Department of Surgery, University of Ottawa, Ottawa, Ontario, Canada; and Glenn Bauman, Department of Oncology, Western University, London, Ontario, Canada. SNMMI's 67th Annual Meeting, July 11-14, 2020.

All 2020 SNMMI Annual Meeting abstracts can be found online at http://jnm.snmjournals.org/content/61/supplement_1.toc.

About the Society of Nuclear Medicine and Molecular Imaging

The Society of Nuclear Medicine and Molecular Imaging (SNMMI) is an international scientific and medical organization dedicated to advancing nuclear medicine and molecular imaging, vital elements of precision medicine that allow diagnosis and treatment to be tailored to individual patients in order to achieve the best possible outcomes.

SNMMI's members set the standard for molecular imaging and nuclear medicine practice by creating guidelines, sharing information through journals and meetings and leading advocacy on key issues that affect molecular imaging and therapy research and practice. For more information, visit http://www.snmmi.org.

Society of Nuclear Medicine and Molecular Imaging

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