Upregulation of PSMA Receptors After Androgen Deprivation Therapy on PSMA PET/CT Imaging in Prostate Cancer

Not Applicable

Completed

• Conditions: Prostate Cancer
• Interventions: Diagnostic Test: PSMA PET/CT

• Registration Number: NCT03938766
• Lead Sponsor: Jewish General Hospital

Brief Summary

Prostate specific membrane antigen (PSMA) is a unique membrane bound glycoprotein, which is overexpressed on prostate cancer cells and is well-characterized as an imaging biomarker of prostate cancer. Studies have shown that PSMA PET/CT can detect prostate cancer lesions with excellent contrast and a high detection rate even when the level of prostate specific antigen is low. PSMA imaging is considered the gold standard in imaging of biochemical recurrence, with detection rate of recurrence in 79.5% of patients, in the largest series of 1007 patients. Despite these excellent results, there remains approximately 20% of patients in whom the site of biochemical recurrence cannot be identified and further research is needed into improving detection rates.

Androgen deprivation therapy (ADT), represents the standard of care treatment for most men with a rising serum PSA and no evidence of disseminated disease on imaging modalities. There has been some preliminary data that imaging patients early after initiation of ADT therapy may increase detection rates of recurrence sites.

The objective of this study is to evaluate if prostate cancer patients with biochemical recurrence and negative PSMA PET/CT can demonstrate in-vivo upregulation of PSMA receptors in an attempt to improve detection rates of recurrent prostate cancer. Patients who are started on ADT when clinically indicated, will have repeat PSMA PET/CT at 4 weeks following initiation of ADT therapy.

Detailed Description

Not available

Study Timeline

• Study Start: 2018-02-02
• Study First Submitted: 2019-05-02
• Study First Submitted QC: 2019-05-02
• Study First Posted: 2019-05-06
• Status Verified: 2020-02
• Primary Completion: 2020-02-01
• Study Completion: 2020-02-01
• Last Update Submitted: 2020-02-11
• Last Update Posted: 2020-02-12

Recruitment & Eligibility

• Status: COMPLETED
• Sex: Male
• Target Recruitment: 2

Inclusion Criteria

• Male sex
• Age 18 years or older
• Previous diagnosis of prostate cancer following radical prostatectomy or primary radiation therapy, with biochemical recurrence.
• Prior negative PSMA PET/CT within 2 months prior to study entry
• ECOG performance status 0 - 3, inclusive
• Able to understand and provide written informed consent
• Initiation of androgen deprivation therapy within 5 weeks prior to study PSMA PET/CT
• Able to tolerate the physical/logistical requirements of a PET/CT scan

Exclusion Criteria

• Medically unstable patients
• Patients who exceed the safe weight limit of the PET/CT bed (200 kg) or who cannot fit through the PET/CT bore (70 cm diameter)
• Patients with unmanageable claustrophobia

Exclusion Criteria

Not provided

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SEQUENTIAL

Arm && Interventions

Group	Intervention	Description
PSMA PET/CT	PSMA PET/CT	Repeat PSMA PET/CT after ADT

Primary Outcome Measures

Name	Time	Method
Detection rates of recurrence	2 years	The percentage of 18F-DCFPyL PET/CT positive for identification of biochemical recurrence sites in patients with prostate cancer following initiation of ADT therapy.

Trial Locations

Locations (1)

Jewish General Hospital; 🇨🇦 Montréal, Quebec, Canada