for males ages 18-80 (full criteria)
at San Francisco, California
study started
estimated completion
Principal Investigator
by Ryan Kohlbrenner
Headshot of Ryan Kohlbrenner
Ryan Kohlbrenner



Prostate-specific membrane antigen (PSMA) agents have shown promise in detecting and treating prostate cancer. Gallium-68-labeled PSMA-11 (68Ga-PSMA-11) is a radioactive agent that binds to prostate cancer cells and can be imaged using positron emission tomography (PET) scanners that detect radioactivity in the body. This early phase I study will use PET to determine if delivering 68Ga-PSMA-11 directly into the prostatic artery (intra-arterial (IA) administration) results in greater uptake in the prostate than delivering 68Ga-PSMA-11 into a vein in the arm (intravenous (IV) administration).

Official Title

Pharmacokinetic Comparison of Selective Prostatic Arterial and Intravenous PSMA Radioligand Infusions in Treatment-Naïve Prostate Cancer Patients


PRIMARY OBJECTIVE: I. To compare the maximum standardized uptake value (SUVmax) in tumoral regions-of-interest during prostatic arterial and intravenous 68Ga-PSMA-11 infusions. SECONDARY OBJECTIVES: I. To compare the tumoral time-activity curves for selective prostatic arterial and intravenous 68Ga-PSMA-11 infusions. II. To study PSMA receptor saturation kinetics during selective prostatic arterial infusion of 68Ga-PSMA-11 (obtained only from arterial time activity curves [TACs] ipsilateral to the side of infusion). OUTLINE: Patients receive 68Ga-PSMA-11 IV over 30 minutes and undergo dynamic PET imaging over infusion period and for 15 minutes after on day 1. 1-14 days later, patients undergo pelvic angiogram and prostatic arterial catheterization. Patients then receive 68Ga-PSMA-11 IA over 30 minutes and undergo dynamic PET imaging over infusion period and for 15 minutes after. After completion of study, patients are followed up with 24 hours after the IA infusion and PET scan.


Prostate Adenocarcinoma, Prostate Carcinoma, Stage IIC Prostate Cancer AJCC v8, Stage III Prostate Cancer AJCC v8, Stage IIIA Prostate Cancer AJCC v8, Stage IIIB Prostate Cancer AJCC v8, Stage IIIC Prostate Cancer AJCC v8, Stage IV Prostate Cancer AJCC v8, Stage IVA Prostate Cancer AJCC v8, Stage IVB Prostate Cancer AJCC v8, Ga68-PSMA-11, Prostatic Neoplasms, Gallium 68 PSMA-11, Angiogram, Catheterization, Gallium Ga-labeled PSMA-11, Positron Emission Tomography, Ga-PSMA-11, PET/CT, Angiogram, and Prostatic Arterial Catheterization


You can join if…

Open to males ages 18-80

  • Age greater than or equal to 18 years and less than or equal to 80 years.
  • Children are excluded from this study because the disease does not occur in children
  • Individuals from age 76 to age 80 must have a prior CT of the abdomen and pelvis within 5 years of first PSMA scan demonstrating non-occlusive pelvic atherosclerosis, regardless of smoking status
  • Individuals over the age of 80 are excluded from this study to improve the likelihood of a catheterizable prostatic artery, given the higher rates of occlusive atherosclerosis with advanced age
  • Ability to provide informed consent
  • Biopsy-proven unilateral or bilateral prostate adenocarcinoma, any stage (any N or any M)
  • Maximal tumor diameter >= 2.0 cm on one or two affected sides, documented on prostate magnetic resonance imaging (MRI) or transrectal ultrasound (TRUS) within 4 months of first scan
  • Gleason score >= 4+4
  • Cancer of the Prostate Risk Assessment (CAPRA) score >= 6

You CAN'T join if...

  • Body mass index (BMI) > 35 kg/m2

  • Prior treatment for prostate cancer, or any use of anti-androgen therapy within 3 months of first scan
  • History of any pelvic radiotherapy
  • Severe atherosclerosis from prior CT imaging study, or greater than 10 pack-year smoking history if no prior imaging available.
  • Stage IV or V chronic kidney disease by estimated glomerular filtration rate (eGFR) within 45 days of first scan
  • Platelet count < 50 x 109/L and/or international normalized ratio > 1.5

  • Severe allergy to iodinated contrast
  • Active urinary tract infection or recent episode of prostatitis within 1 month of first scan
  • Inability to tolerate prolonged supine positioning


  • University of California San Francisco accepting new patients
    San Francisco California 94143 United States

Lead Scientist at UCSF

  • Ryan Kohlbrenner
    Ryan Kohlbrenner, MD, is an Assistant Professor in the Interventional Radiology subspecialty in the Department of Radiology and Biomedical Imaging at the University of California, San Francisco. He received his medical degree from the University of Chicago Pritzker School of Medicine, Illinois, and he completed a one-year internship at Washington University, St.


accepting new patients
Start Date
Completion Date
Ryan Kohlbrenner, MD
Phase 1 Prostate Cancer Research Study
Study Type
Expecting 5 study participants
Last Updated