An Locametz/68Ga-PSMA-11 or flotufolastat F 18 PSMA scan are an advanced, highly sensitive imaging test used to detect the precise location and spread of prostate cancer. It combines the metabolic targeting of a radioactive tracer with the anatomical detail of a CT scan to map cancer cells anywhere in the body.
Why It Is Used
- Initial Staging: Used for newly diagnosed, high-risk prostate cancer patients to see if the disease has spread to lymph nodes or bones before surgery or radiation.
- Biochemical Recurrence: Detects the exact location of cancer recurrence at a very early stage, even when blood PSA levels are extremely low.
- Theranostics: Helps determine if a patient qualifies for targeted radioligand therapies, such as Pluvicto, by confirming the presence of the PSMA target on the tumors.
How It Works
- Targeted Tracking: Prostate cancer cells naturally produce high amounts of a specific protein on their surface called Prostate-Specific Membrane Antigen (PSMA).
- The Tracer: A specialized radioactive tracer is injected into your bloodstream and acts like a homing missile, binding directly to these PSMA proteins.
- Precision Mapping: The PET/CT scanner detects the radioactive signal from the tracer, creating a detailed 3D map that illuminates even microscopic clusters of prostate cancer cells.
The Procedure
- Preparation: Unlike standard PET scans, no strict fasting or special diets are required, though you are encouraged to stay well-hydrated.
- Injection & Waiting: The PSMA tracer is administered through a small IV line, followed by a resting period of approximately 50 - 100 minutes to allow the tracer to circulate.
- The Scan: You will lie flat on a motorized table that passes through the doughnut-shaped scanner. The imaging process takes about 20 to 30 minutes.
- Aftercare: The tracer naturally decays and leaves your body through your urine. Drinking plenty of water and frequent urination helps flush it out quickly.
Safety and Benefits
- Low Radiation: The tracer delivers a very small, safe dose of radiation that disappears from your system within a single day.
- Unmatched Sensitivity: It is significantly more accurate at finding small tumors and bone metastases than traditional bone scans or standard CT/MRI imaging.