for males ages 18 years and up (full criteria)
at San Francisco, California
study started
completion around
Principal Investigator
by Robert Bok, MD, PhD
Headshot of Robert Bok
Robert Bok



This is a Phase 2 clinical study of hyperpolarized (HP) 13C-pyruvate (13C), 15N-urea (13C,15N) metabolic MR imaging in prostate cancer patients who are undergoing or have received radiation therapy for prostate cancer.

Official Title

A Phase 2 Study of Magnetic Resonance (MR) Imaging With Hyperpolarized 13C-Pyruvate +/- 13C,15N-Urea in Patients With Prostate Cancer Undergoing Radiation Therapy



  1. Part 1: To Optimize the imaging sequences that maximize signal-to-noise ratio (SNR) and intra-tumoral kPL and kPG in regions of tumor vs. adjacent benign tissue as assessed by mpMRI imaging characteristics.

II. Part 2A To perform HP 13C-MRI and measure the changes in tumoral kPL and kPG.

III. Part 2B: To perform HP 13C-MRI and study the metabolic effects (changes in tumor kPL and kPG).

IV. Part 3: To perform HP 13C-MRI at time of Biochemical Failure and measure tumoral kPL and kPG, in previously SBRT treated patients.


  1. To evaluate the intra-patient variability in intra-tumoral kPL and kPG with repeated dose studies (Part 1, 2 & 3).

II. To determine the association between peak intra-tumoral kPL observed on baseline imaging with serum PSA. (Part 2 & 3).

III. To determine the association between changes in intra-tumor kPL after 4-12 weeks of systemic hormone therapy and PSA response (Part 2B).

IV. To compare and contrast intra-tumoral kPL and kPG with Prostate Imaging Reporting and Data System (PI-RADS) version 2 and individual mpMRI parameters including apparent diffusion coefficient (ADC) on diffusion-weighted imaging (Part 1, 2 & 3).

  1. To describe the frequency of up-grading of tumor with MR/US-guided fusion biopsy obtained following baseline HP-MRI exam. (Part 3).

VI. To further characterize the safety profile of HP C-13 pyruvate injections (Part 1, 2 & 3).

VII. For patients imaged with HP 13C-MRI at time of biochemical failure post-SBRT, correlate peak intra-tumoral kPL and kPG with radiotherapy dose distributions from SBRT course (Part 3).

VIII. For studies incorporating HP 13C-urea, the baseline and the on-treatment changes in ureaAUC parameter will be measured and compared to kPL endpoints of the same lesions (Part 1, 2 & 3).


The study is divided into 3 parts. Part 1: Participants undergo imaging as part of a multi-parametric magnetic resonance imaging (mpMRI) exam to determine exact parameters for imaging.

Part 2A: Participants planned for stereotactic body radiotherapy (SBRT) Part 2B: Participants with high-risk localized prostate cancer planned to receive primary radiation therapy with concurrent systemic hormone therapy Part 3: Evaluable SBRT participants scanned at time of biochemical failure and MR/US fusion-guided prostate biopsy within 12 weeks. Participants have the option of undergoing a follow up HP Pyruvate +/- Urea MR exam 6-15 months following the baseline scan.

All participants will receive a scan at baseline and other procedures may be performed as part of routine, non-interventional standard of care at the time of biochemical failure, including serial prostate-specific antigen (PSA) monitoring and gene expression profiling of tumor tissue. Participants will be followed for 24 months after last procedure or removal from study, or until death, whichever occurs first.


Prostate Cancer, Imaging Studies, Hyperpolarized 13C-Pyruvate, Prostatic Neoplasms, Hormones, hyperpolarized pyruvate +/-urea (13C/15N), Non-investigational Stereotactic body radiotherapy (SBRT), Radiotherapy (RT), Multi-parametric magnetic resonance imaging (mpMRI), Non-interventional hormone therapy, Prostate Biopsy


You can join if…

Open to males ages 18 years and up

  1. Participants must have biopsy-proven adenocarcinoma of the prostate, as determined by medical chart review.
  2. For:
    1. Part 1: Participants post-radiation therapy or currently considering SBRT.
    2. Part 2A: Participants currently scheduled for or considering SBRT (no neo-adjuvant therapy planned).
    3. Part 2B: Participants currently scheduled for or considering SBRT and neo-adjuvant therapy is planned. The participant has biopsy-proven adenocarcinoma of the prostate with high-risk disease, defined by the presence of at least two of following criteria: a tumor stage of T3 or T4, a Gleason score of 8 to 10, or a PSA level ≥40 ng/mL) and the participant must be planning to receive androgen deprivation therapy (ADT) with an Luteinizing hormone-releasing hormone (LHRH) agonist or antagonist. The addition of an androgen-receptor (AR) signaling inhibitor (e.g., abiraterone, bicalutamide,apalutamide, enzalutamide or darolutamide) will be allowed.
    4. Part 3: Participants who have previously received radiation treatment to the prostate and are exhibiting signs of biochemical failure, with planned fusion biopsy within 12 weeks following completion of baseline HP 13C pyruvate +/-urea mpMRI.
  3. Participant is able and willing to comply with study procedures and provide signed and dated informed consent.
  4. Eastern Cooperative Oncology Group (ECOG) performance status <= 1.
  5. Age >= 18 years old at time of study entry.
  6. Ability to understand and the willingness to sign a written informed consent document.
  7. Demonstrates adequate organ function as defined below:
    1. White Blood Cell count (WBC) >=4000 cells/μL.
    2. Hemoglobin ≥9.0 gm/dL.
    3. Platelets ≥75,000 cells/μL.
    4. Renal Function > 30 Epithelial Growth Factor Receptor (eGFR).

You CAN'T join if...

  1. Evidence of pelvic regional or distant metastatic disease on conventional imaging (MRI, computed tomography or whole body bone scan) or prostate-specific membrane antigen (PSMA) Positron Emission Tomography (PET) imaging. PSMA-avid lymph nodes confined to the pelvis will be allowed if <1 centimeter (cm).
  2. Prostate biopsy performed within 14 days prior to baseline C-13 HP pyruvate MRI.
  3. Poorly controlled hypertension, with blood pressure at study entry > 160 mm Hg systolic or > 100 mm Hg diastolic. Treatment with anti-hypertensives and re-screening is permitted.
  4. Contraindication to or inability to tolerate MRI with endorectal coil (e.g. severe claustrophobia, presence of cardiac pacemaker, aneurysm clip, severe or painful hemorrhoids, rectal stricture).
  5. Congestive heart failure with New York Heart Association (NYHA) status >= 2.
  6. History of clinically significant ECG abnormality, including QT prolongation, a family history of prolonged QT interval syndrome or myocardial infarction within 6 months of study entry.


  • UCSF
    San Francisco California 94143 United States

Lead Scientist at UCSF

  • Robert Bok, MD, PhD
    Robert Bok, MD, PhD, is a Professor in the Department of Radiology and Biomedical Imaging and the Hyperpolarized MRI Technology Resource Center at the University of California, San Francisco. Dr. Bok obtained his PhD in Biochemistry from the University of Illinois in 1984, and he earned his MD in Medicine from The Johns Hopkins University, Baltimore in 1989.


not yet accepting patients
Start Date
Completion Date
Robert Bok, MD, PhD
Phase 2 Prostate Cancer Research Study
Study Type
Expecting 161 study participants
Last Updated