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Response Assessment & Scan Explainers
A confirmation scan was ordered — what does that actually mean?
Your oncologist has asked for a confirmation scan, and the phrase itself sounds like something has already gone wrong. It usually hasn't. Under the iRECIST framework referenced in NCCN and ASCO guidance, an early immunotherapy scan showing growth or a new spot cannot yet be trusted on its own — a confirmation scan is the specific, planned step that settles the question. This page explains why it is ordered, how long the gap usually is, and what typically happens to your treatment while you wait — it explains the pattern only; it does not interpret your own report.
Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed August 2026
- A safety check, not a verdict — a confirmation scan exists because an early growth result on immunotherapy can't be trusted alone, not because your doctor already suspects the worst
- It follows an "unconfirmed" result — under iRECIST, early growth on a scan is labelled iUPD, a category built specifically for this pattern
- The gap is usually 4-8 weeks — long enough for a genuine immune reaction to settle, or for true growth to become clear
- Most patients continue current treatment meanwhile — stopping over one unconfirmed scan can mean losing ground on something that may still be working
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Why has my oncologist ordered a confirmation scan?
A confirmation scan is ordered when an earlier immunotherapy scan showed a tumour looking bigger, or a new spot, that your oncologist isn't ready to call true progression. Under the iRECIST framework used for immune checkpoint inhibitors, this kind of early result is labelled "unconfirmed" rather than final, and a repeat scan checks whether it was real growth or a temporary immune reaction.
Hearing the words "confirmation scan" can feel alarming — it can sound like your doctor already suspects the worst. In practice, it is closer to the opposite: it exists precisely because an early scan showing growth on immunotherapy cannot yet be trusted on its own. Response frameworks such as iRECIST, developed by the RECIST working group and referenced in NCCN and ASCO guidance, were built specifically to handle a pattern unique to this class of drug — where the very immune cells the treatment activates can gather around a tumour and mimic growth before any real shrinkage becomes visible.
Response-assessment PET-CT and other imaging for CION patients is coordinated through partner imaging centres. This page explains the general terminology behind why a confirmation scan is requested; it does not interpret your own report — only your treating oncologist can do that.
Did you know?
The word "unconfirmed" on a scan report is a specific category, not vague language. Under iRECIST, growth seen on a single scan during immunotherapy is called iUPD (unconfirmed progression) until a second, confirmation scan settles the question.
The Gap, And What It Can Show
How long is the gap before a confirmation scan?
The gap is typically four to eight weeks from the scan that first raised the question, following the iRECIST framework referenced in NCCN and ASCO guidance. That window is thought to be long enough for a genuine immune reaction to settle, while short enough that real progression is not left unchecked.
Categories shown follow the iRECIST framework developed by the RECIST working group and referenced in NCCN/ASCO guidance for trials of immune checkpoint inhibitors, indicative as of August 2026. This table is general education, not an interpretation of any individual scan — only your oncologist can assign the category that applies to your report.
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Don't let a confirmation scan cause panic while you wait
Bring your scan timeline to a free, confidential consultation. A CION oncologist will walk through what it may mean and what typically happens next.
While You Wait
Does treatment continue while I wait for the confirmation scan?
In most cases, yes. If you are feeling stable or better, oncology teams generally continue your current immunotherapy plan during the four-to-eight-week wait rather than pausing or switching off a single unconfirmed scan. Here is what most protocols actually do while you wait.
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Your current plan usually stays unchanged
Continuing a treatment that may still be working, rather than stopping over one uncertain scan, is the general approach when you are clinically stable.
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Your symptoms are tracked closely
Any new or worsening symptoms are reviewed at every visit and can bring the repeat scan forward if your team feels it's needed.
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The scan date is fixed in advance
Most teams schedule the confirmation scan at a set point in the four-to-eight-week window rather than leaving it open-ended.
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New or worsening symptoms come first
If pain, breathlessness or other symptoms clearly worsen before the scheduled scan, contact your oncology team promptly rather than waiting.
The Mechanism
What is pseudoprogression, and why does a confirmation scan resolve it?
Pseudoprogression is an apparent increase in tumour size, or a new spot, that later turns out not to reflect true cancer growth. Immune checkpoint inhibitors work by releasing a brake on your own immune cells, which then travel to the tumour to do their work — and when enough of them arrive together, the area can swell and look bigger on an early scan before any real shrinkage shows up.
This pattern is described in NCCN and ASCO guidance as genuine but relatively uncommon, and it is most extensively documented in melanoma. Data in several other cancer types is thinner — if your cancer type is not one where this pattern is well studied, that is worth raising directly with your oncologist rather than assuming it either way.
While You Watch And Wait
What should I watch for while waiting for the confirmation scan?
No single sign proves the outcome either way — these are worth mentioning to your oncology team before the scheduled scan.
- New or clearly worsening symptoms — pain, breathlessness or swelling that is genuinely getting worse, not just how you feel on a given day.
- A real decline in daily function — a falling performance status is weighed alongside the scan, not replaced by it.
- Growth-type symptoms at more than one site — several areas of concern together are viewed differently from a single new spot.
- Blood markers or organ tests moving the wrong way — these add weight to a picture but are never read alone.
- A confirmation scan appointment that gets delayed — flag this early with your treatment team rather than letting the window drift.
If you notice rapid symptom worsening, contact your oncology team promptly rather than waiting for the scheduled confirmation scan — this page explains general patterns, it does not triage individual symptoms.
Related Reading
Understanding the wider response-assessment picture
- SUV Values on PET After Immunotherapy: Why They Can Rise — the PET-specific version of the same "growth that isn't growth" pattern this page explains for CT-based confirmation scans.
- New Lymph Nodes Lighting Up on Your Scan — what a new node on a report can mean, and why it too is often reviewed with a confirmation scan rather than an immediate call.
- Tumour Markers on Immunotherapy: Why They Are Less Useful — why a blood marker moving alone rarely settles the same question a confirmation scan is built to answer.
- Immunotherapy at CION Cancer Clinics — the full picture of how CION supports patients through the immunotherapy decision and journey.
This page explains general terminology behind why a confirmation scan is ordered during immunotherapy, for education only, and does not interpret any individual patient's report. Response-assessment PET-CT is coordinated at partner imaging centres. Bring your report to a consultation for a doctor's assessment of what it means for you.
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Common questions
Confirmation scan on immunotherapy: your questions answered
Why has my oncologist ordered a confirmation scan?
A confirmation scan is usually ordered when an earlier scan during immunotherapy showed a tumour looking bigger, or a new spot appearing, before your doctor is willing to call it true disease progression. Under the iRECIST framework used for immune checkpoint inhibitors and referenced in NCCN and ASCO guidance, this kind of early finding is classified as "unconfirmed progression" rather than a final result, because immune cells gathering around a tumour can sometimes look like growth on imaging without being true cancer growth. The confirmation scan checks whether the finding has genuinely grown further or has settled, before any decision is made about your treatment.
How long is the gap before a confirmation scan?
The gap is typically four to eight weeks from the scan that first showed unconfirmed growth, following the iRECIST framework referenced in NCCN and ASCO guidance for patients on immune checkpoint inhibitors. This window is thought to be long enough for a genuine immune reaction around the tumour to settle and show shrinkage, while still being short enough that true progression, if that is what is happening, does not go unchecked for long. The exact gap your oncologist recommends can vary a little depending on your cancer type, how you are feeling, and how the first scan was reported, so always follow the specific date your own treatment team gives you.
Does treatment continue while I wait for the confirmation scan?
In most cases, yes — if you are clinically stable or feeling the same or better, oncology teams generally continue the current immunotherapy plan during the four-to-eight-week wait for a confirmation scan, rather than pausing or switching treatment off a single unconfirmed result. This is because stopping a treatment that may still be working, based on a scan finding that could turn out to be pseudoprogression, can mean losing ground unnecessarily. Continuing is not automatic, though — it depends on your symptoms, performance status and cancer type, and your oncologist may recommend a different approach in specific situations. If you develop new or worsening symptoms while waiting, contact your treatment team promptly rather than waiting for the scheduled scan.
What happens if the confirmation scan shows more growth?
If the confirmation scan shows the tumour has grown further, or additional new areas have appeared, compared with the scan that first raised concern, this is generally classified as confirmed progression under the iRECIST framework. Your oncologist will typically discuss this result with you directly and review whether to continue, adjust or change your treatment plan, often after discussion at a tumour board. A confirmed-progression result on a scan is not, by itself, information about how long you may have — it is information about how one specific treatment is or is not controlling disease at this point in time, and it opens a conversation about what comes next rather than closing one.
What happens if the confirmation scan shows shrinkage or no change?
If the confirmation scan shows the earlier finding has shrunk or stayed about the same, this is generally consistent with pseudoprogression rather than true cancer growth, and most protocols continue the current immunotherapy plan without a change. Your oncologist will usually explain that the swelling seen on the first scan reflected immune cells acting on the tumour rather than the cancer growing, and that future scans will continue to be reviewed at their usual scheduled intervals. This result is reassuring, but it is still your treatment team's assessment of your specific scan, not a general guarantee for anyone in this situation.
What is pseudoprogression, and why does a confirmation scan resolve it?
Pseudoprogression is an apparent increase in tumour size, or a new spot on a scan, that later turns out not to reflect true cancer growth — it is thought to happen when immune cells activated by immunotherapy gather in and around a tumour, causing temporary swelling that can look like growth on imaging. It cannot be told apart from true progression on a single scan, which is exactly why a confirmation scan is ordered: a follow-up scan four to eight weeks later, showing whether the area has grown further or settled down, is what actually resolves the question, described in NCCN and ASCO guidance as a recognised part of assessing response to immune checkpoint inhibitors.