A Prospective Pilot Study Investigating rhPSMA 7.3 PET/MRI in Detecting Recurrent Disease and Aid in Radiotherapy Planning in Patients With Biochemically Recurrent Prostate Cancer

  • End date
    Apr 28, 2023
  • participants needed
  • sponsor
    M.D. Anderson Cancer Center
Updated on 27 October 2022


This prospective pilot study will assess the feasibility of rh PSMA 7.3 positron emission tomography/magnetic resonance imaging (PET/MRI) scans in detecting prostate cancer that may have come back (recurrent) in patients with increasing levels of prostate-specific antigen (PSA) following prostate surgery (biochemically recurrent). An increase in PSA levels alone does not tell the doctor where the cancer may be or how much cancer there may be. Imaging tests, like a bone scan, MRI, and/or computed tomography, are often performed to help the doctor learn where or how much cancer there is, and how best to treat the cancer. rhPSMA-7.3 is a radioactive tracer agent that when used with PET/MRI imaging may help diagnose and look for the spread of prostate cancer. Prostate-specific membrane antigen (PSMA) is a protein that is expressed in prostate cancer and this agent targets the PSMA molecule. Giving rh PSMA 7.3 during PET/MRI may help doctors better find where the cancer may be spreading and how much of it there is. The results of this trial may also guide in radiotherapy planning.



I. To evaluate the positive predictive value and detection rate of fluorine F 18 rhPSMA-7.3 (F-18 rhPSMA-7.3) positron emission tomography (PET)/magnetic resonance imaging (MRI) in detecting recurrent disease in prostate cancer patients with biochemical recurrence.


I. To determine the change in salvage radiation treatment plan after F-18 rhPSMA-7.3 PET/MRI imaging.


I. To assess the feasibility of utilizing the PSMA avid recurrent disease on PET/MRI as an alignment tool for MR guided radiotherapy (MR linear accelerator [MR-LINAC]).

II. To assess the treatment response in those patients who demonstrate rhPSMA-7.3 avid disease on the first PET/MRI scan.


Patients receive F-18 rhPSMA-7.3 intravenously (IV) and after approximately 60 minutes of uptake time, will undergo PET/MRI over 60 minutes. Patients with evidence of F-18 rhPSMA-7.3 disease in the first PET/MRI scan undergo a second F-18 rhPSMA-7.3 PET/MRI at 6 months after the second dose of standard hormonal therapy.

After completion of study treatment, patients are followed up within 7 days.

Condition Biochemically Recurrent Prostate Carcinoma, Localized Prostate Carcinoma, Prostate Adenocarcinoma
Treatment magnetic resonance imaging, positron emission tomography, Fluorine F 18 rhPSMA-7.3
Clinical Study IdentifierNCT04978675
SponsorM.D. Anderson Cancer Center
Last Modified on27 October 2022


Yes No Not Sure

Inclusion Criteria

Patient is male and aged > 18 years old
History of localized adenocarcinoma of the prostate status post (s/p) radical prostatectomy
An initial elevated PSA >= 0.2 followed by a subsequent confirmatory PSA >= 0.2 clinically suspicious for biochemically recurrent disease
If the patients were previously taking androgen deprivation therapy (ADT), it should be discontinued at least 12 weeks prior to the study
Patient willing to provide signed informed consent and willing to comply with all required study schedule events, where safe and feasible

Exclusion Criteria

Patients with any medical condition or circumstance that the investigator believes may compromise the data collected or lead to a failure to fulfil the study requirements
Patients who are planned to have an Iodinated contrast agent with computed tomography (CT) or gadolinium based contrast agent with MRI or other PET radiotracer < 24 hours prior to the PET scan
Patients with contraindication to undergo MRI
Patients with extreme claustrophobia
Patients with prior allergy to MRI contrast agent
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