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How an interim PET scan shapes Hodgkin treatment | CION Cancer Clinics
An interim PET-CT is done partway through Hodgkin lymphoma chemotherapy, usually after two cycles. If it shows a good response, treatment can often be lightened, for example by dropping bleomycin or fewer cycles. If active disease remains, the plan may be stepped up. This page explains the Deauville score on your report, how the result changes treatment, and what the scan cannot tell you. At CION Cancer Clinics, our haematology team plans myeloma and lymphoma care with you, discussed at a tumour board and explained in plain words.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- What is an interim PET scan in Hodgkin lymphoma?
- What does the Deauville score on my report mean?
- How can the result change your treatment?
- Where does the scan fit in the treatment course?
- What can an interim PET not tell you?
- What do families often misread about the scan?
- Common questions about interim PET in Hodgkin lymphoma
The short answer
What is an interim PET scan in Hodgkin lymphoma?
An interim PET-CT is a scan done partway through chemotherapy for Hodgkin lymphoma, usually after the first two cycles. Its result is used to adjust the rest of treatment: lighter if the lymphoma has responded well, stronger if active disease is still showing.
Why the middle of treatment matters
Hodgkin lymphoma often responds quickly. How much it has shrunk after a short first stretch of treatment tells doctors a great deal about how it will behave from here. A fast response suggests the remaining treatment can safely be reduced. A slower one suggests it needs more.
What "response-adapted" means
It means the plan is not fixed on the first day. Instead, the whole course is built around this scan. The goal is to give each person enough treatment to control the lymphoma, without giving everyone the heaviest version. Fewer drugs or no radiotherapy can mean fewer long-term effects on the heart, lungs, fertility and risk of a second cancer.
How the scan is done
It is the same PET-CT you had at diagnosis. A small amount of radioactive sugar is injected, you rest quietly, and the scanner shows which areas are still taking up sugar fast. The timing is planned for just before the next cycle is due, so the chemotherapy itself does not blur the picture.
A scan is one part of the decision. Your haematologist reads it alongside your stage, blood tests and how you are feeling.On your report
What does the Deauville score on my report mean?
Reports use a five-point scale. Each area that was active is compared with two normal reference points in the chest and the liver.
- Score one
- No uptake at all in the areas that were active before.
- Score two
- Some uptake, but no brighter than the large blood vessels in the middle of the chest.
- Score three
- Brighter than the chest vessels but not brighter than the liver. Most plans count this as a good response.
- Score four
- Somewhat brighter than the liver. Usually read as a positive scan, meaning active disease may remain.
- Score five
- Much brighter than the liver, or a new area of disease. Read as a positive scan.
- Complete metabolic response
- No area remains more active than expected. Also written as CMR.
Not sure whether this applies to you?
Ask an oncologistWhat changes
How can the result change your treatment?
These are the common paths. Your own plan depends on your stage and the regimen you started on.
Negative scan on ABVD
For advanced disease, many teams drop bleomycin and continue with AVD for the remaining cycles. This lowers the risk of lung damage.
Suits most
- Older adults, where lung risk is higher
- People with past lung problems
Positive scan on ABVD
The plan may step up to a more intensive regimen such as escalated BEACOPP, where age and fitness allow. Some teams arrange a biopsy first if the result is unclear.
Not usually suited to
- Adults over about sixty
- People with heart or kidney problems
Negative scan on BEACOPP
The total number of cycles can often be shortened, which lowers the risk of infections and some long-term effects.
If the scan after BEACOPP is still positive, the course usually runs in full, and radiotherapy to any area still active at the end scan may be added.Early-stage disease
A negative scan may allow radiotherapy to be left out. The trade-off is a slightly higher chance of relapse, against fewer late effects.
This is a real choice to talk through, not a rule.The pathway
Where does the scan fit in the treatment course?
-
Baseline PET-CT at diagnosis
Shows every active area and sets the stage. Keep this scan and its report, because every later scan is compared against it.
-
First two cycles
Usually ABVD or escalated BEACOPP, given the same way for everyone with that stage.
-
Interim PET-CT
Done shortly before the third cycle is due. The report is often ready within a day or two.
-
The team decides
The haematologist reviews the score with the radiologist, often at a tumour board, and explains any change in the plan to you.
-
Rest of treatment and end scan
Treatment continues on the adjusted plan. A final PET-CT checks the result once treatment is complete.
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Being straight with you
What can an interim PET not tell you?
An interim PET cannot promise that the lymphoma will not come back, and a positive scan does not mean treatment has failed. It is a guide to the next step, not a verdict.
False alarms happen
Inflammation, infection, a healing biopsy site and the bone marrow recovering after growth factor injections can all light up. A bright spot is not always lymphoma. When the score does not match the rest of the picture, the team may repeat the scan later or take a biopsy.
A clear scan is not a finish line
Treatment still continues after a negative interim scan, and stopping early on your own is dangerous. A small number of people with a clear scan still relapse later, which is why follow-up continues.
It does not predict your own outlook as a number
Studies describe how groups of people do. They cannot tell you exactly what will happen to you. Ask your haematologist what your result means in your situation, and which other factors they are weighing alongside it.
If reading the report before your appointment is frightening, bring it with you rather than deciding what it means alone.Commonly believed
What do families often misread about the scan?
"Deauville three means the cancer is still there."
In most treatment plans a score of three is counted as a good response. Some uptake is expected in tissue that is healing. Ask how your team reads it.
"If the scan is clear, we can stop chemotherapy now."
The clear scan guides how the remaining cycles look, not whether to have them. Stopping early raises the risk of relapse. Only the treating team should change the plan.
"A positive scan means nothing else will work."
Response-adapted plans exist precisely so a positive scan can lead to a stronger option. Many people who step up treatment go on to do well.
"Doing the scan at a different centre makes no difference."
Machines and preparation differ, which can change how bright areas look. Where possible, have the interim scan where the baseline was done, and always carry the earlier discs.
Questions we are asked
Common questions about interim PET in Hodgkin lymphoma
When exactly is the interim PET done?
Usually after two cycles, timed just before the next cycle is due. Scanning too soon after a drip or growth factor injection can make the picture harder to read. Your team books the date around your chemotherapy calendar, so ask them before moving any appointment.
Do I need to prepare differently from the first scan?
The preparation is the same. Fast as instructed, drink plain water, keep warm and rest quietly after the injection. If you are diabetic or on steroids, tell the scan centre when you book, because blood sugar affects the result. Bring your earlier scan discs and reports.
My report says Deauville 4. What happens now?
A score of four is usually read as a positive scan. Your haematologist will look at which areas remain active and how bright they are, and may change the treatment plan, repeat the scan or suggest a biopsy. Wait for that conversation before drawing conclusions about your outlook.
Is it safe to drop bleomycin after a clear scan?
Large trials support dropping bleomycin for many people with advanced Hodgkin lymphoma whose interim scan is negative. The rest of the treatment continues as AVD. Your team decides whether it suits your stage and history, so do not stop any drug on your own.
Can the interim scan be skipped to save money?
Skipping it usually means everyone gets the full, heavier plan, which can cost more in side effects and sometimes money. Aarogyasri, CGHS, ECHS, EHS, PM-JAY and cashless insurance often cover scans that are part of a treatment plan. Scheme rules change, so check your current cover.
Will I be radioactive afterwards?
The amount used is small and leaves the body quickly, mostly in urine. Many centres suggest keeping a little distance from babies and pregnant women for the rest of that day. Drink plenty of water and pass urine often.
Does a positive interim scan always need a biopsy?
Not always. If the result fits the rest of the picture, the team may act on it directly. If only one small area is bright, or it could be infection, a biopsy can settle the question before a major change in treatment is made.
Is this approach used for children with Hodgkin lymphoma?
Yes. Paediatric plans also use early response scans, often to decide whether radiotherapy can be avoided, because children are more sensitive to its long-term effects. The details differ from adult plans, so ask the child's haematology team to explain their protocol.
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Sources
- National Cancer Institute — Adult Hodgkin Lymphoma Treatment (PDQ) - Patient Version
- Cancer Research UK — Hodgkin lymphoma
- American Cancer Society — Treating Hodgkin lymphoma
- Leukemia & Lymphoma Society — Hodgkin lymphoma
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
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