Gallium Ga 68-labeled PSMA-11 PET/CT and Fluciclovine F18 PET/CT in Imaging Participants With Recurrent Prostate Cancer After Surgery

Jonsson Comprehensive Cancer Center50 enrolled

Overview

This phase II trial compares how well gallium 68-labeled PSMA-11 positron emission tomography/computed tomography (PET/CT) works compared to fluciclovine F18 PET/CT in imaging participants with prostate cancer after surgery that has come back. PET is an established imaging technique that uses small amounts of radioactivity and CT images provide an exact outline of organs and potential inflammatory tissue where it occurs in the body. Diagnostic procedures, such as PET/CT with gallium 68-labeled PSMA-11, may work better than PET/CT with fluciclovine F18 in helping find out how far the prostate cancer has spread.

PRIMARY OBJECTIVES: I. To compare the detection rates of gallium 68-labeled PSMA-11 (\[68\]Ga-PSMA-11) PET/CT and fluciclovine F18 (Axumin) PET/CT for the identification of tumor location(s), by patient and region based analysis. SECONDARY OBJECTIVES: I. Detection rate on a per-patient basis of (68)Ga-PSMA-11 PET/CT and Axumin PET/CT, stratified by prostate-specific antigen (PSA) value (0.2 - \< 0.5; 0.5 - \< 1.0; 1.0 - \< 2.0). II. Sensitivity and positive predictive value (PPV) on a per-patient basis, of (68)Ga-PSMA-11 PET/CT and Axumin PET/CT for the detection of tumor location(s), confirmed by histopathology/biopsy and/or clinical and conventional imaging follow-up. III. Agreement among the readers, separate for (68)Ga-PSMA-11 PET/CT versus Axumin PET/CT. OUTLINE: Participants receive (68)Ga-PSMA-11 intravenously (IV) and 60-90 minutes later, undergo PET/CT imaging over 3 hours. Participants also undergo best standard of care Axumin PET/CT within 2 weeks before or after (68)Ga-PSMA-11 PET/CT. After completion of the PET/CT scan, participants are followed up between 1 and 3 days and up to 12 months.

Study Type

INTERVENTIONAL

Allocation

Purpose

DIAGNOSTIC

Masking

NONE

Enrollment

Eligibility

Sex: MALEMin age: 19 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Histopathologically proven prostate cancer (PCa) * Radical prostatectomy as definitive treatment for PCa * Proven biochemical recurrence as defined by American Urological Association (AUA) recommendation: PSA greater than or equal to 0.2 ng/mL measured more than 6 weeks after radical prostatectomy * PSA values ranging from 0.2 ng/mL to 2 ng/mL * No prior salvage therapies (including salvage radiotherapy and/or salvage lymph node dissection) * Axumin PET/CT scan already performed or scheduled as best standard of care procedure for suspected disease relapse within 2 weeks before or after intended 68Ga-PSMA-11 PET/CT * Karnofsky performance status of ≥ 50 (or Eastern Cooperative Oncology Group (ECOG)/World Health Organization \[WHO\] equivalent) * Ability to understand a written informed consent document and the willingness to sign it Exclusion Criteria: * Any change in prostate cancer treatment between Axumin and 68Ga-PSMA PET/CT scan * Unable to lie flat, still or tolerate a PET scan

Outcomes

Primary Outcomes

Gallium 68-labeled PSMA-11 ([68]Ga-PSMA-11) and fluciclovine F18 (Axumin) detection rates

Will compare rates for the identification of tumor location(s), assessed by patient and region based analysis. This will be calculated and reported along with the corresponding two-sided 95% confidence intervals. The confidence intervals will be constructed using the Wilson score method. Detection rate in the per-participant analysis is defined as number of participants with PET positive disease, independent of pathology or imaging/clinical follow-up. Detection rate in the per-region analysis is defined as number of regions (prostate bed, pelvic lymph-nodes, extra-pelvic lymph-nodes, bone metastases, other soft tissue) resulted PET positive, independent of pathology or imaging/clinical follow-up.

Time frame: Up to 15 months: through data analysis completion (anonymized central imaging read), an estimation of 3 months after enrollment completion.

Secondary Outcomes

Detection rates on a per-patient basis of 68^Ga-PSMA-11 PET and Axumin PET

This will be stratified by prostate-specific antigen (PSA) value (0.2 - \< 0.5, 0.5 - \< 1.0, 1.0 - \< 2.0, 2.0 - \< 5.0, ≥ 5.0) and will be summarized in tabular format and compared between PSA using chi-square analysis. Detection rate is defined as number of participants with PET positive disease, independent of pathology, imaging or clinical follow-up.

Time frame: Up to 1 year after completion of PET/CT with 68^Ga-PSMA-11

Sensitivity and PPV by-participant and region-based analysis of 68^Ga-PSMA-11 PET and Axumin PET for detection of tumor location(s)

The sensitivity and positive predictive values (PPV) will be calculated and reported along with the corresponding two-sided 95% confidence intervals. The confidence intervals will be constructed using the Wilson score method. Only participants having histopathology/biopsy and/or clinical and conventional imaging follow-up will be analyzed

Time frame: Up to 1 year after completion of PET/CT with 68^Ga-PSMA-11

Inter-observer (reader) agreement

Agreement will be calculated separately for 68\^Ga-PSMA-11 PET/CT versus Axumin PET/CT. For binary data, agreement among central readers will be evaluated using Fleiss' k. For non-binary data with more than ten observations, agreement among central readers will be evaluated by interclass correlation coefficient (ICC). Ninety-five percent confidence intervals (CIs) will be reported for k and ICC values. Interpretation of k and ICC will be based on a classification provided by Landis and Koch: 0.0, poor; 0.0-0.20, slight; 0.21-0.40, fair; 0.41-0.60, moderate; 0.61-0.80, substantial; 0.81-1.00, almost-perfect reproducibility.