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Home Urologic Oncology Prostate Cancer

Recurrence of prostate cancer detected earlier with innovative PSMA-ligand PET/CT

by Urology Today
November 2, 2022
in Featured Urology, Prostate Cancer, Urologic Oncology, Urology / Nephrology News
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A recent study reported in The Journal of Nuclear Medicine compared use of the novel Ga-68-PSMA-ligand PET/CT with other imaging methods and found that it had substantially higher detection rates of prostate-specific membrane antigen (PSMA) in patients with biochemical recurrence after radical prostatectomy. Discovering a recurrence early can strongly influence further clinical management, so it is especially noteworthy that this hybrid PSMA-ligand identified a large number of positive findings in the clinically important range of low PSA-values (

<0.5ng/mL).

According to the CDC, prostate cancer is the most common cancer among men in the United States, after non-melanoma skin cancer. While many men with prostate cancer die from other causes, prostate cancer remains one of the leading causes of cancer death among men of all races. Treatment and survival after recurrence depend on many factors, but early detection of the recurrence is certainly key.

Matthias Eiber, MD, corresponding author of the study, noted, “

The study is the first to examine this highly promising PET tracer in the use of a homogeneous patient collective consisting of only those with biochemical recurrence after radical prostatectomy. It found superb detection rates compared to other tracers, like choline, or imaging modalities, like MRI. For patients, this means that the referring urologist can receive earlier and more precise information about the site and extent of metastatic disease. Physicians will also be better able estimate whether a PSMA-PET scan might be useful in a specific setting.”

The study evaluated 248 patients with biochemical recurrence (median PSA level of 1.99ng/mL and a range of 0.2-59.4ng/mL) after radical prostatectomy. All were given contrast-enhanced PET/CT after injection of 155±27MBq Ga-68-PSMA-ligand. The detection rates were then correlated with PSA-level and PSA-kinetics. Influencing factors that were assessed include anti-hormonal treatment and primary Gleason score, as well as the contribution of PET and morphological imaging to the final diagnosis.

For 222 (89.5 percent) of the patients, the test detected higher than normal levels of PSMA. Whereas detection rates increased with higher PSA-velocity, no significant association could be found for PSA doubling-time.

In addition, the exciting news is that Ga-68-PSMA-ligand PET (compared to CT) exclusively provided pathological findings in 81 (32.7 percent) patients. In 61 (24.6 percent) patients, it exclusively identified additional involved regions. And, for those with a higher Gleason score (?7vs.?8), detection efficacy was significantly increased (P = 0.0190).

Dr. Eiber stated, “These findings will certainly enhance the use of PET in the diagnostic workup of patients with recurrent prostate cancer. When regulatory hurdles and reimbursement issues are overcome, this tracer might gain significant acceptance beyond Europe.”

###

Authors of the article “Evaluation of Hybrid 68Ga-PSMA-ligand PET/CT in 248 Patients with Biochemical Recurrence after Radical Prostatectomy” include Matthias Eiber, Tobias Maurer, Michael Souvatzoglou, Ambros J Beer, Alexander Ruffani, Bernhard Haller, Hubert Kübler, Uwe Haberkorn, Michael Eisenhut, Hans-Jürgen Wester, Jürgen E Gschwend, and Markus Schwaiger.

Please visit the SNMMI Media Center to view the PDF of the study, including images, and more information about molecular imaging and personalized medicine. To schedule an interview with the researchers, please contact Laurie Callahan at (703) 652-6773 or .(JavaScript must be enabled to view this email address).

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 raising public awareness about nuclear medicine and molecular imaging, a vital element of today’s medical practice that adds an additional dimension to diagnosis, changing the way common and devastating diseases are understood and treated and helping provide patients with the best health care possible.

SNMMI’s more than 17,000 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.

###

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