The purpose of this study is to compare the diagnostic performance of [89Zr]-Df-IAB2M PET/CT with that of [111In]-capromab pendetide as an immuno PET tracer in the detection of prostate cancer pre-prostatectomy as confirmed by pathology.

Individuals participating in this study will have a [111In]-capromab pendetide scan, as well as a PET scan following the injection of [89Zr]-Df-IAB2M.

IAB2M is an approximately 80 kDA molecular weight antibody fragment (a "Minibody") chelated with Desferroxamine and radiolabeled with 89Zr. [89Zr]-Df-IAB2M targets the extracellular domain of Prostate Membrane Specific Antigen (PSMA) expressed on most primary and metastatic prostate cancer lesions.

[111In]-capromab pendetide (Prostascint®) is an FDA approved imaging agent targeting the intracellular domain of PSMA. It is anticipated that [89Zr]-Df-IAB2M will outperform Prostascint® because of this targeting difference.

Inclusion Criteria:

Patients must meet ALL criteria listed below for entry:

• Age ≥ 18 years

• Signed, written IRB-approved informed consent

• Patients newly diagnosed with biopsy-proven prostate cancer, thought to be a candidate for prostatectomy after standard diagnostic evaluation (e.g. chest x-ray, CT scan or MRI) who are at high-risk for pelvic lymph node metastases.

• High Risk defined as:

  • Gleason score ≥ 8 or
  • Gleason 4+3 with a PSA > 10 or
  • PSA > 20 ng/mL or
  • T3a

• Patients scheduled for a [111In]-capromab pendetide scan or had a recent [111In]-capromab pendetide scan within 28 days of screening visit or would be willing to undergo a [111In]-capromab pendetide scan

• Karnofsky Performance status of ≥ 60

• Life expectancy of at least 6 months

• Patients with any previous history of another malignancy (other than in-situ cancer, basal or squamous cell skin cancer) must be disease free for a period of three years.

• Acceptable liver function:

  • Bilirubin ≤ 1.5 times upper limit of normal or <3 x ULN for patients with Gilbert's disease
  • AST (SGOT), ALT (SGPT) and Alkaline phosphatase ≤ 2.5 times upper limit of normal (if liver metastases are present, then ≤ 5 x ULN is allowed)

• Acceptable renal function:

  • Serum creatinine within normal limits, OR
  • calculated creatinine clearance ≥ 60 mL/min/1.73 m2 for patients with creatinine levels above institutional normal.

• Acceptable hematologic status:

  • Granulocyte ≥ 1500 cells/mm3
  • Platelet count ≥ 150,000 (plt/mm3)
  • Hemoglobin ≥ 9 g/dL

• For men of child-producing potential, the use of effective contraceptive methods during the study

Exclusion Criteria:

Patients will be excluded from entry if ANY of the criteria listed below are met:

• New York Heart Association Class III or IV, cardiac disease, myocardial infarction within the past 6 months
• Unstable arrhythmia, or evidence of ischemia on ECG
• Active, uncontrolled bacterial, viral, or fungal infections, requiring systemic therapy
• Treatment with radiation therapy, surgery, chemotherapy, or investigational therapy for prostate cancer.
• Unwillingness or inability to comply with procedures required in this protocol
• Known infection with HIV, hepatitis B, or hepatitis C
• Serious nonmalignant disease (eg, hydronephrosis, liver failure, or other conditions) that could compromise protocol objectives in the opinion of the investigator and/or the sponsor
• Previous [111In]-capromab pendetide image test