Prostate cancer · theranostics
PSMA PET-CT and Lu-177 Therapy: — Why the Scan Comes First
If your oncologist has raised Lu-177 PSMA therapy as an option, the first step is always a PSMA PET-CT scan. The scan establishes whether the therapy has a target to aim at — and without that answer, treatment cannot begin.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026
- The scan gates the therapy — Lu-177 PSMA can only reach cancer cells that express the PSMA protein. The scan confirms whether yours do, and to what degree.
- Same target, two uses — The molecular address the tracer finds on the scan is the same one the therapy uses to deliver radiation to the cancer cell.
- A CT is not enough — Standard CT and bone scans cannot measure PSMA expression. This scan answers a different question from the ones you may have had before.
- Expression level matters — Qualifying is not just yes or no. Your team assesses how strongly your cancer expresses PSMA across all its deposits.
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Your PSMA PET-CT scan is done first to confirm that your tumour cells express the PSMA protein in sufficient amounts for Lu-177 therapy to reach them. Without it, there is no way to know whether the treatment would find its target. The scan result is what decides eligibility — not the cancer type alone.
A whole-body PET-CT at CION costs from Rs 10,499 — among the lowest published prices in Hyderabad. Indicative price, as of September 2026.
Why does the scan have to come before treatment?
Lu-177 PSMA therapy works by attaching a radioactive molecule to the PSMA protein on cancer cells, delivering radiation directly to those cells.
If your cancer cells do not express enough PSMA, the therapy has nothing to bind to. It would move through your body without reaching the tumour.
The PSMA PET-CT tracer targets the same protein. Where the tracer shows uptake on the scan, the therapy can potentially reach. That connection is why the scan is not a preliminary formality — it is the gate.
What actually decides whether you qualify?
The primary requirement is a scan showing sufficient PSMA expression across your cancer deposits. Deposits that do not take up the tracer cannot be reached by the therapy, and your team looks carefully at those.
Your treatment history also matters. Regulatory approval for Lu-177 PSMA therapy in prostate cancer covers patients who have already received specific prior treatments — your oncologist will confirm whether your history meets that threshold.
Kidney and salivary gland function are checked separately, because the therapy can affect both. The scan result, the treatment history, and the organ-function tests together inform the eligibility decision.
What is the pathway from scan to therapy?
Oncologist referral
Your medical oncologist or urologist assesses your case and confirms whether PSMA PET-CT is the right next step for you.
Scan booking
PSMA PET-CT is coordinated through a partner imaging centre. Tracer availability is confirmed at booking, not assumed in advance.
The scan itself
You receive a small injection of the PSMA tracer and wait for it to circulate. The full process from injection to images takes roughly two hours.
Report and assessment
A nuclear medicine specialist reads the images. Your oncologist reviews the findings alongside your treatment history and organ-function results.
Treatment decision
If all criteria are met, your team discusses whether to proceed to Lu-177 PSMA therapy and coordinates the next steps, including referral if needed.
PET-CT Partner Centres
PET-CT Scan Centres in Hyderabad
CION offers PET-CT scans through 4 trusted partner PET-CT centres across Hyderabad, so you can choose the one closest to you. Call 18002028726 and we’ll guide you to the earliest available appointment.
PET-CT Centre — Punjagutta
PET-CT Centre — Himayatnagar
PET-CT Centre — Narayanaguda
These are partner diagnostic centres within the CION network. Toll-free booking: 18002028726.
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Terms your team may use — and what they mean
- PSMA
- Prostate-specific membrane antigen. A protein on the surface of most prostate cancer cells. The more strongly a cancer expresses it, the more visible it is on the scan — and the more precisely the therapy can target it.
- Theranostics
- An approach that uses the same molecular target first for imaging, then for treatment. PSMA theranostics pairs the diagnostic scan with a therapy that seeks the same protein — the scan is built into the treatment design, not added on.
- Radioligand therapy
- A treatment where a radioactive particle is attached to a molecule that seeks out a specific protein on cancer cells. Lu-177 PSMA therapy is a radioligand therapy.
- PSMA-positive
- A scan result showing that your cancer deposits express the PSMA protein at levels your team considers sufficient for radioligand therapy to be potentially useful.
- Heterogeneous expression
- When some cancer deposits take up the tracer strongly and others show little or none. Deposits with low uptake cannot be reached by the therapy, and your team weighs this when deciding whether treatment is appropriate.
Did you know?
The same molecular address that the PSMA tracer finds on a cancer cell during the scan is the one Lu-177 uses to deliver radiation to it during treatment.
This 'find it and treat it at the same target' principle is what makes the prior scan not optional — it is the mechanism the therapy depends on.
Source: European Medicines Agency — Pluvicto (lutetium (177Lu) vipivotide tetraxetan) summary of product characteristics
Questions people ask before this scan
If my scan is negative, does that mean my cancer is untreatable?
No. A negative or low-PSMA scan means Lu-177 PSMA therapy is unlikely to help you — not that your cancer has no options. Many effective treatments do not depend on PSMA expression at all. Being found ineligible for this specific pathway is clinical information about which treatment fits your disease, not a verdict on your prognosis. Your oncologist will explain what alternatives are indicated for your situation.
How is this different from the FDG PET-CT I have already had?
FDG PET-CT measures glucose uptake by metabolically active cells. PSMA PET-CT measures a different thing entirely — the expression of a specific protein on cancer cells. They answer different questions. Some prostate cancer deposits that are invisible on FDG PET-CT show clearly on PSMA PET-CT, and vice versa. If you have had both, your team uses the results together rather than treating one as a replacement for the other.
What is the indicative cost, and does insurance cover it?
PSMA PET-CT is available through partner imaging centres at an indicative cost of around ₹23,999 (as of mid-2026 — prices change over time and vary by centre). Whether your insurer covers it depends on your policy. When you ask your insurer, ask specifically about PSMA PET-CT rather than PET-CT in general, because cover decisions often turn on the specific tracer used rather than the scan category.
Will the tracer definitely be available on my scan date?
Tracer availability is confirmed at the time of booking, not guaranteed in advance. Radioactive tracers have short shelf lives and are produced in limited quantities at specialist facilities. If supply is disrupted close to your appointment, it is a production issue — not something specific to your case. Your team will rebook as soon as tracer is available. If you have a treatment timeline, tell the booking team so they can plan accordingly.
Can the scan miss cancer that is actually there?
Yes, in two ways. Cancer deposits that express little or no PSMA will not take up the tracer and will not appear on the scan. Very small deposits may also fall below the resolution of the scanner. This is one reason your team reviews PSMA PET-CT findings alongside your other imaging rather than in isolation. ESMO guidance is clear that scan results should always be interpreted in their full clinical context.
Is Lu-177 PSMA therapy the same as chemotherapy?
No. Lu-177 PSMA therapy is a radioligand therapy. It delivers targeted radiation directly to cancer cells expressing the PSMA protein, using a molecule designed to seek those cells out. Chemotherapy works by different mechanisms — it targets dividing cells more broadly and does not depend on PSMA expression. The two treatments have different side effects and different indications. Your oncologist will explain which class applies to your situation and why.
Book a PET-CT at CION from Rs 10,499 — among the lowest published prices in Hyderabad — with an oncologist-reviewed report and a free Rs 950 consultation, across 4 partner centres. Indicative price, as of September 2026.
Explore 72 more Specialised Tracers and How PET-CT Compares topics
PSMA PET-CT
- False Positives on PSMA PET
- Is PSMA PET Available in Hyderabad and How Soon?
- Is PSMA PET Covered by Insurance or Aarogyasri?
- PSMA PET Before Prostate Surgery or Radiation
- PSMA PET and Lu-177 PSMA Therapy: The Link
- PSMA PET for Cancers Other Than Prostate
- PSMA PET vs Bone Scan and MRI for Prostate Cancer
- PSMA PET vs Normal FDG PET for Prostate Cancer
- PSMA PET-CT Scan Cost in Hyderabad
- PSMA PET-CT: What It Is and Who Needs It
- PSMA-Avid Lesions: What the Report Means
- Preparing for a PSMA PET-CT Scan
- Reading a PSMA PET Report: PRIMARY and miTNM
- Repeat PSMA Scans: How Often and Why
- Rising PSA With a Negative PSMA Scan: What Now?
- When Should You Get a PSMA PET Scan?
DOTANOC & DOTATATE PET-CT
- DOTA PET and PRRT (Lu-177 DOTATATE) Therapy
- DOTANOC and DOTATATE PET-CT: What They Are
- DOTANOC vs DOTATATE: Is There a Difference?
- DOTATATE PET-CT Cost in Hyderabad
- False Positives on DOTA PET Scans
- Is DOTA PET Covered by Insurance in India?
- Is DOTATATE PET Available in Hyderabad?
- Preparing for a DOTANOC or DOTATATE Scan
- Reading a DOTA PET Report
- The Krenning Score on Your DOTA PET Report
- When Is a DOTA PET Scan Ordered?
- Why Do I Need Both a DOTA PET and an FDG PET?
FAPI, F-DOPA & Newer Tracers
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- Can You Choose Your Own Tracer?
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- F-18 NaF Bone PET: A Better Bone Scan?
- F-DOPA PET-CT: Uses in Parkinson's and Paraganglioma
- FAPI PET-CT Cost in Hyderabad
- FAPI PET-CT: The Tracer That Finds What FDG Misses
- FAPI vs FDG: When the Newer Tracer Is Better
- FES PET for Hormone-Receptor Breast Cancer
- MIBG Scan vs DOTA PET: Which for Neuroendocrine Disease?
- New PET Tracers Coming to India
- Tracer Availability and Why Your Scan Date Is Fixed
- Which PET Tracer Do You Actually Need?
- Why Specialised Tracers Cost More Than FDG
PET-CT vs Other Scans
- Can an MRI Replace a PET-CT to Avoid Radiation?
- Choosing Between Scans: A Decision Guide by Question
- Combining PET-CT With MRI in the Same Week
- Diagnostic CT vs the CT Inside a PET-CT
- Do You Need Both a CT and a PET-CT?
- Follow-Up Scanning: Alternating PET With Other Tests
- PET-CT vs Biopsy: Which Actually Diagnoses Cancer?
- PET-CT vs Bone Scan for Bone Metastases
- PET-CT vs CT Scan: What Is the Difference?
- PET-CT vs MRI: Which Do You Need?
- PET-CT vs PET-MRI: Is the Newer Machine Better?
- PET-CT vs Tumour Markers for Follow-Up
- PET-CT vs Ultrasound and Mammography
- PET-CT vs Whole-Body MRI for Screening
- When Is a PET-CT Not the Right Test?
- Why Your Doctor Ordered PET-CT and Not a Cheaper Scan
Timing Around Treatment
- Baseline PET-CT Before Starting Treatment: Why It Matters
- Can a PET-CT Be Done During Active Chemotherapy?
- Emergency and Urgent PET-CT: When It Cannot Wait
- How Soon After a Previous PET Can You Have Another?
- Interim vs End-of-Treatment Scanning
- PET-CT After Growth Factor Injections
- PET-CT After Steroids: Does It Affect the Scan?
- PET-CT After a Biopsy: How Long to Wait
- PET-CT Before Surgery: What Surgeons Want to Know
- Scanning Too Early: Why It Wastes Money and Causes Panic
- When Should You Have a PET-CT After Chemotherapy?
- When Should You Have a PET-CT After Immunotherapy?
- When Should You Have a PET-CT After Radiotherapy?
- When Should You Have a PET-CT After Surgery?
Your next step
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Common questions
Frequently asked questions
What does a PSMA PET scan show that a standard CT cannot?
A CT scan shows the size and position of cancer deposits. A PSMA PET-CT shows whether those deposits express the PSMA protein — something a CT cannot measure at all. The PSMA scan can also detect small deposits in lymph nodes and bone that do not appear on CT. The two scans give different information, and in prostate cancer management they are often used alongside each other, each answering a question the other cannot.
Do I need to prepare anything before the PSMA PET-CT?
You will usually be asked to fast for a period before the scan and to avoid strenuous exercise in the day before. Specific instructions come from the partner imaging centre at the time of booking, because requirements can vary slightly. Do not stop any medication without asking your team first. If you have kidney problems, mention them before the scan — the tracer clears through the kidneys, and your team may want to check your function levels first.
How long after the scan will I know the result?
Images are ready quickly, but the written report from a nuclear medicine specialist typically takes a few days to reach your oncologist. Ask your team when to expect the report and when they will discuss it with you, so you are not waiting without a timeline. If you have not heard within the window your team gave you, it is reasonable to follow up rather than continuing to wait.
Can I be assessed for this pathway at CION?
PSMA PET-CT scans are coordinated through partner imaging centres at CION. Your oncologist at a CION centre can assess whether you are a candidate for the PSMA pathway and arrange the scan. For Lu-177 PSMA therapy itself, your team will advise whether treatment is available at your treating centre or requires referral to a specialist facility. CION does not provide CAR-T or cell therapy; if that has been mentioned separately, it would be at a different centre.
What should I tell my oncologist if I want to explore this option?
Tell your oncologist that you have heard about PSMA PET-CT and Lu-177 PSMA therapy and want to know whether they apply to your case. Come with your full treatment history — which therapies you have received and when. Ask directly whether PSMA expression has been assessed, whether your cancer type and stage are ones where this pathway is indicated, and what the alternatives are if it is not. Writing the answers down during the appointment helps, because these conversations are difficult to remember afterwards.
Is there any risk from the tracer injection itself?
The radiation dose from a PSMA PET-CT is small and is considered acceptable for a diagnostic investigation of this type. The tracer clears from your body within hours. Most people have no reaction to the injection, and serious reactions are uncommon. If you have impaired kidney function, tell your team before the scan — they may want to check your levels first, since the tracer is cleared through the kidneys.