PSMA-PET Imaging of Salivary Gland Tumours and Other Rare Cancers

Study Overview
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Brief Summary
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The objectives of this pilot feasibility study, which is on the use of 68-Ga PSMA PET imaging of salivary gland tumours, are to determine the proportion of patients with high PSMA-ligand uptake on Ga-68 PSMA imaging in locally advanced, recurrent or metastatic salivary gland cancers and other rare cancer; and to determine if in vitro PSMA expression correlates to PSMA-ligand uptake on Ga-68 PSMA imaging in locally advanced, recurrent or metastatic salivary gland cancers and other rare cancers. The hypotheses of this study are that there is high PSMA-ligand uptake on Ga-68 PSMA imaging in locally advanced, recurrent or metastatic salivary gland cancers and other rare cancers; and that in vitro PSMA expression correlates to PSMA-ligand uptake on Ga-68 PSMA imaging.

Detailed Description
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The potential participant will be screened and confirmed for eligibility by the appropriate study-team member. A signed IRB approved informed consent will be obtained prior to conducting any study-related procedures. On the scheduled visit date for the study, An intravenous cannula (plug) will be inserted in a vein in the participant's arm, through which the 68-Ga PSMA radiotracer for the scan will be injected. The infusion will take about 1-2 minutes. PET imaging will be performed with a dedicated PET/CT scanner. 2.5-6.0 mCi (depending on weight of the patient) of PSMA radiotracer will be injected intravenously. A PET scan will be done around 60 minutes after the injection of the 68-Ga PSMA imaging agent. During imaging, the participant will be asked to lie still and may be asked to hold his/her breath for a few seconds. Imaging will be performed using a PET/CT, which will take 30 to 40 minutes to complete. Imaging of the body from vertex to mid thigh or feet will be obtained. After the completion of the scan, the plug will be removed. A Final Study Visit will take place on that one scheduled day. The participant will not need to visit the doctor's office during the course of the study outside of their usual scheduled doctor's follow up appointments.

Official Title
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PSMA-PET Imaging of Salivary Gland Tumours and Other Rare Cancers

Conditions
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Salivary Gland Tumor, Rare Malignant Neoplasm

Intervention / Treatment
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* Diagnostic Test: 68-Ga PSMA PET scan


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Locally advanced, metastatic or locally recurrent salivary gland cancers OR rare cancers (Examples of rare cancers: thyroid ca, cholangio ca, pancreatic ca, gall bladder ca, sarcoma) Sample of biopsied tissue available for analysis Histologically confirmed diagnoses Above 21 years of age Able to provide informed consent Exclusion Criteria: Those who do not meet above inclusion criteria Diagnosis of haematological malignancies Patients with more than one cancer diagnosis Contraindication to 68Ga-PSMA PET/CT E.g.: pregnant patients, breast feeding patients, renal impairment, liver impairment, allergy to components of the test Any psychological, familial, sociological or geographical condition potentially hampering compliance with the study protocol and follow up schedule Ongoing participation in any other clinical trial

Ages Eligible for Study
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Minimum Age: 21 Years
Maximum Age: 99 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| 68-Ga PSMA PET scan<br>68-Ga PSMA PET scan | Diagnostic Test: 68-Ga PSMA PET scan<br>* On the scheduled visit date for the study, An intravenous cannula (plug) will be inserted in a vein in the participant's arm, through which the 68-Ga PSMA radiotracer for the scan will be injected. The infusion will take about 1-2 minutes. PET imaging will be performed with a dedicated PET/CT scanner. 2.5-6.0 mCi (depending on weight of the patient) of PSMA radiotracer will be injected intravenously.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| The proportion of patients with high PSMA-ligand uptake on Ga-68 PSMA imaging in locally advanced, recurrent or metastatic salivary gland cancers and other rare cancer. | The proportion of patients with PSMA-ligand uptake greater than liver uptake on Ga-68 PSMA imaging in locally advanced, recurrent or metastatic salivary gland cancers and other rare cancer. | Through study completion, to June 2024. | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Correlation between in vitro PSMA expression and PSMA-ligand uptake on Ga-68 PSMA imaging in locally advanced, recurrent or metastatic salivary gland cancers and other rare cancers. | Correlation between the value of IHC PSMA expression and the PSMA PET SUVmax in locally advanced, recurrent or metastatic salivary gland cancers and other rare cancers. | Through study completion, to June 2024. | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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68-Ga PSMA PET Imaging, Salivary Gland, Radiolabeling, Gallium-68, PET scan, Prostate Specific Membrane Antigen, Adenocystic Carcinoma, Rare Tumours