PET scan results
Stable Metabolic Disease: — Good News or Bad?
Seeing 'stable metabolic disease' on a PET report is confusing. The word stable can sound like nothing changed — or like nothing worked. On a PET scan it has a specific technical meaning, and understanding that meaning is the starting point for a useful conversation with your team.
Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026
- It is a defined response category — Stable metabolic disease is a formal PET reporting term, not a vague description of an unclear result.
- Not automatically a sign of failure — For some cancers and treatments, holding disease in place is a recognised and intended outcome.
- The report describes — your team interprets — The radiologist states what the scanner shows. Your oncologist decides what it means for your care.
- Context decides the meaning — The same result can have different implications depending on your cancer type, treatment, and stage.
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Stable metabolic disease is a formal PET reporting category. It means the cancer's FDG uptake has not changed enough to qualify as a response or as progression. It is not the same as treatment failure. Whether it is reassuring depends on your cancer type and what your oncologist was expecting to see at this point.
What does stable metabolic disease mean on a PET scan?
Stable metabolic disease is one of four formal response categories used in PET reporting. It means the cancer's FDG uptake — the measure of how metabolically active the tumour is — has not changed enough since your last scan to count as improvement or worsening.
The category exists because some changes in tumour activity are too small to be meaningful. Frameworks such as PERCIST, which nuclear medicine departments and oncology teams use internationally, define a specific threshold. Anything within that range is reported as stable.
The radiologist who writes the report is describing what the scanner shows. Your oncologist then places that description into the context of your treatment — what the aim was, how long you have been on treatment, and what else the team is watching.
What this result does and does not tell you
- The tumour's metabolic activity has not changed significantly.It has not decreased enough to qualify as a response, and it has not increased enough to qualify as progression.
- It is not a diagnosis of treatment failure.Stable disease is a recognised outcome in international response criteria — not a residual category for results that do not fit elsewhere.
- It does not predict what the next scan will show.A result that is stable now does not tell you whether it will remain stable, improve, or worsen at the next assessment.
- The report describes the scan — your team interprets it.The meaning of stable in your situation depends on your cancer type, treatment aim, and where you are in your care plan.
Terms used in PET response reporting
- FDG (Fluorodeoxyglucose)
- A radioactive tracer injected before the PET scan. Cancer cells often absorb more FDG than normal tissue, which is how areas of high metabolic activity show up on the scan.
- SUVmax / SULpeak
- Numbers that measure how much FDG a given area has absorbed. These values are compared between scans to determine whether activity has changed in a meaningful way.
- CMR — Complete Metabolic Response
- FDG uptake in the tumour has disappeared or fallen to background tissue levels. No measurable metabolic activity remains in the assessed area.
- PMR — Partial Metabolic Response
- FDG uptake has decreased meaningfully compared to the previous scan, but some activity remains. The decrease meets a defined threshold in the reporting framework.
- SMD — Stable Metabolic Disease
- FDG uptake falls within a defined range of no meaningful change — not enough decrease to call it a response, and not enough increase to call it progression.
- PMD — Progressive Metabolic Disease
- FDG uptake has increased meaningfully, or new areas of FDG uptake have appeared. This indicates the disease is growing or spreading in metabolic terms.
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Is stable disease a sign that treatment is not working?
Many people read 'stable' and hear 'nothing is happening'. That fear is worth naming directly: stable metabolic disease does not mean treatment has failed.
For certain cancers — particularly those treated with targeted therapies or immunotherapy — holding disease in place is a planned outcome, not a compromise. Response criteria from ASCO and ESMO recognise stable disease as a distinct category precisely because disease control is a meaningful clinical goal.
Whether stable is the result your team was hoping for depends on the treatment aim set at the start. Your oncologist can tell you whether this result is on track, or whether it prompts a rethink.
Did you know?
Disease control rate — which includes stable disease alongside partial and complete responses — is used as a primary endpoint in clinical trials for cancers where shrinkage is not expected from the treatment being tested.
In those trials, stable disease counts as a positive outcome, not a neutral one.
Source: PERCIST 1.0 criteria; referenced in ASCO and ESMO response assessment guidance
What families ask about a stable result
Does stable disease mean my treatment continues as planned?
That depends on what your team was expecting at this stage and what the treatment aim is. For some regimens, stable disease at an early scan is exactly what the plan predicted, and treatment continues without change. For others, the team may want to see more response before continuing. This is a question your oncologist should answer directly, with your scan result and full treatment history in front of them — not a question the report category alone can settle.
Is stable disease worse than a partial response?
In terms of the formal response hierarchy, a partial response — where metabolic activity has decreased meaningfully — is a stronger signal than stable disease. But what that difference means for you depends heavily on the cancer and the treatment type. For slow-growing cancers or maintenance therapy, stable disease sustained over many months can represent excellent disease control. The hierarchy of categories does not map directly onto the hierarchy of outcomes for every patient.
Can stable disease become a full response later?
Yes, in some cases. With certain treatments — immunotherapy in particular — an early stable result can precede a delayed response that only becomes visible on a later scan. This pattern is recognised in ESMO guidance on immunotherapy response assessment and is one reason teams do not always act immediately on a stable result. Whether delayed response is a realistic possibility for your situation depends on the treatment type and cancer behaviour, and your oncologist will know.
My symptoms feel worse even though the scan says stable. What does that mean?
Tell your team. Symptoms and PET findings do not always move in parallel, and both matter. A stable scan does not cancel out worsening symptoms — it is additional information alongside them, not a reassurance that overrides how you feel. Your oncologist will want to know about any change in symptoms at the same time as reviewing the scan result. Do not wait for your next scheduled appointment if something has changed significantly since the scan.
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Explore 94 more Understanding Your PET-CT Report topics
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- Deauville Score 1 to 5: The Lymphoma Scale Explained
- End-of-Treatment PET Scan: What It Decides
- How Doctors Judge Whether Treatment Is Working on PET-CT
- Interim PET Scan During Chemotherapy: Why It Is Done
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- PERCIST Criteria: How Metabolic Response Is Measured
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- Progressive Metabolic Disease: What Happens Next
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- Stable Metabolic Disease: Good News or Bad?
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Common questions
Frequently asked questions
What does stable metabolic disease mean in simple terms?
It means the cancer's activity on PET — measured by how much radioactive tracer the tumour absorbs — has not changed enough since the last scan to count as improvement or worsening. It sits in the middle of four formal response categories. The tumour is neither clearly responding nor clearly growing in measurable terms. What that means for your care is a conversation for your oncologist, who has your full history.
Is stable metabolic disease the same as remission?
No. Remission means there has been a measurable reduction in disease. Stable metabolic disease means the level of activity on the scan has not changed significantly — it has not decreased enough to qualify as a response. They are separate categories under international response criteria, and stable disease does not count as remission. Your oncologist will explain which category applies and what it means for your treatment plan.
What is the difference between stable and progressive disease on a PET?
Progressive metabolic disease means FDG uptake has increased beyond a defined threshold, or new areas of uptake have appeared — indicating the cancer is growing. Stable disease means uptake has not changed enough in either direction to cross that threshold. The distinction matters because progressive disease typically prompts a treatment reassessment, while stable disease may not. Your oncologist uses the specific numbers from your report to determine which category applies to you.
Should I be worried if my PET shows stable metabolic disease?
Whether to be worried depends on what your team was expecting and where you are in treatment. For some cancers and regimens, stable disease is the intended result. For others, more response was hoped for. The most useful question to ask your oncologist is: 'Is this the result you were expecting at this point?' That will get you a more direct answer than the report category alone can give you.
What usually happens next after a stable PET result?
Your oncologist will review the result alongside your symptoms, blood tests, and clinical examination before deciding anything. Options include continuing treatment as planned, adjusting the regimen, or arranging a further scan at a set interval to see whether the result changes. What happens in your case depends on the cancer type, the treatment, and how long this stable result has continued. Your team will explain the next step at your review.
Can I get a second opinion on a PET result that shows stable disease?
Yes, and it is a reasonable thing to do. A second opinion can involve sending your scan images and report to another nuclear medicine specialist, or your clinical summary to another oncologist. Asking for one is not a sign of distrust — it is a normal part of cancer care, particularly when a result is ambiguous or when a decision about changing treatment depends on it. Ask your treating team to help arrange it, or contact another centre directly.