A Study to Evaluate 177Lu-PSMA-R2 in Patients with PSMA Positive Progressive, Metastatic, Castration Resistant Prostate Cancer


About this study

The purpose of this study is to determine the safety, tolerability and pharmacokinetics (how the study drug and imaging agent is absorbed, moves, and is eliminated by your body can be analyzed) and dosimetry (how much radiation taken by the organs and tumors can be measured) of the study drug 177Lu-PSMA-R2 and imaging agent 68Ga-PSMA-R2 in subjects who have progressive metastatic castration-resistant prostate cancer

Participation eligibility

Participant eligibility includes age, gender, type and stage of disease, and previous treatments or health concerns. Guidelines differ from study to study, and identify who can or cannot participate. There is no guarantee that every individual who qualifies and wants to participate in a trial will be enrolled. Contact the study team to discuss study eligibility and potential participation.

Inclusion Criteria:

  • Male patients, 18 years of age or older.
  • Signed and dated written ICF by the patient or legally acceptable representative prior to any study-specific procedures.
  • Histologically confirmed adenocarcinoma of the prostate.
  • Serum testosterone levels < 50 ng/L after surgical or continued chemical castration.
  • Metastatic disease documented by CT/MRI or bone scan (not older than 28 days at enrollment) revealing at least one metastatic lymph-node, visceral metastasis and/or bone metastasis.
  • Positive 68Ga-PSMA-R2 PET/CT scan for central eligibility assessment. Patients who receive 68Ga-PSMA-R2 as part of separate clinical protocol are eligible (must meet all study eligibility criteria).
  • Documented disease progression on or after prior systemic treatment administered for the advanced disease including CYP 17 inhibitors and/or androgen-pathway inhibitors (i.e. abiraterone and/or enzalutamide when available) and no more than one line of chemotherapy for the advanced disease, or patients who were ineligible (unfit) to receive chemotherapy. Disease progression defined as increasing serum PSA (per PCWG3), radiological progression or ≥ 2 new bone lesions. (Chemical castration is required unless surgically orchiectomized).
  • At least 28 days elapsed between last anti-cancer treatment administration and the initiation of study treatment (except for Luteinizing Hormone-releasing Hormone [LHRH] or Gonadotropin-releasing Hormone [GnRH]), or resolution of all previous treatment related toxicities to CTCAE version 4.03 grade of ≤ 1 (except for chemotherapy induced alopecia and grade 2 peripheral neuropathy or grade 2 urinary frequency which are allowed). Prior major surgery must be at least 12 weeks prior to study entry.
  • Eastern cooperative oncology group (ECOG) performance status of 0-2 with a life expectancy ≥ 6 months.
  • Adequate bone marrow reserve and organ function as demonstrated by complete blood count, and biochemistry in blood and urine at baseline:
    • Platelet count of >100 x10^9/L;
    • White blood cell (WBC) count 3,000/mL;
    • Neutrophil count of > 1,500/mL;
    • Hemoglobin ≥ 10 g/dL;
    • Serum creatinine < 1.5 x upper limit normal (ULN) or estimated glomerular filtration rate (GFR) > 50 mL/min based upon Chronic Kidney Disease-Epidemiology Collaboration (CKD-EPI) equation. Patients with estimated GFR between 50 - 60 mL/min at baseline will require a 99mTc-DTPA GFR test and only patients with non-obstructive pathology will be included in the study.
  • Total bilirubin < 3 x ULN (except if confirmed history of Gilbert''s disease).
  • Baseline serum albumin > 30 g/L.
  • Aspartate aminotransferase (AST) < 3 times the ULN.
  • For male patients with partners of childbearing potential, agreement to use barrier contraceptive method (condom) and to continue its use for 6 months from receiving the last dose of IP.

Exclusion Criteria:

  • Pathological finding consistent with small cell, neuroendocrine carcinoma of the prostate or any other histology different than adenocarcinoma,
  • Previously administered chemotherapy or 223Ra-therapy within the context of diffuse bone or bone-marrow involvement (i.e., "superscan" defined as bone scintigraphy in which there is excessive skeletal radioisotope uptake [> 20 bone lesions] in relation to soft tissues along with absent or faint activity in the genitourinary tract due to diffuse bone/ bone marrow metastases).
  • Current severe urinary incontinence, hydronephrosis, severe voiding dysfunction, any level of urinary obstruction requiring indwelling/condom catheters.
  • Spinal cord compression or brain metastases.
  • Uncontrolled pain that results in patient''s lack of compliance with the imaging procedures.
  • Uncontrolled cardiovascular history, defined as:
    • Congestive heart failure (New York Heart Association [NYHA] II, III, IV);
    • Mean resting corrected QT interval (QTc) > 450 millisecond (msec), obtained from 3 ECGs recordings, using the screening clinic ECG machine-derived QTc value;
    • Any clinically relevant abnormalities in rhythm, conduction, or morphology of resting ECG (e.g., complete left bundle branch block, third-degree heart block, second-degree heart block, PR interval >250 msec);
    • Any factor increasing the risk of QTc prolongation or risk of arrhythmic events such as heart failure, hypokalemia, congenital long QT syndrome, family history of long QT syndrome, or unexplained sudden death under 40 years of age in first-degree relatives, or any concomitant medication known to prolong the QT interval.
  • Other known co-existing malignancies except non-melanoma skin cancer unless definitively treated and proven no evidence of recurrence for 5 years.
  • History of deep vein thrombosis and/or pulmonary embolism within 4 weeks of enrollment.
  • Known incompatibility to CT or PET scans.
  • Any evidence of severe or uncontrolled systemic or psychiatric diseases, including uncontrolled hypertension and active bleeding diatheses, which in the Investigator''s opinion makes it undesirable for the patient to participate in the trial or which would jeopardize compliance with the protocol.
  • Active infection including human immunodeficiency virus (HIV) and untreated hepatitis B, and hepatitis C. Screening for chronic conditions is not required.
  • Patients who have received any investigational treatment agent within the last 28 days.
  • Known allergies, hypersensitivity, or intolerance to the IP or its excipients.
  • Known history of myelodysplastic syndrome/leukemia at any time.
  • Patient is unlikely to comply with study procedures, restrictions and requirements and judged by the Investigator that the patient is not suitable for participation in the study.

Participating Mayo Clinic locations

Study statuses change often. Please contact the study team for the most up-to-date information regarding possible participation.

Mayo Clinic Location Status Contact

Rochester, Minn.

Mayo Clinic principal investigator

Geoffrey Johnson, M.D., Ph.D.

Contact us for the latest status

Contact information:

Cancer Center Clinical Trials Referral Office

(855) 776-0015

More information


Publications are currently not available

Study Results Summary

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Supplemental Study Information

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