Hematologist
CION Cancer Clinics
Second cancers after a bone marrow transplant | CION Cancer Clinics
Yes, a bone marrow transplant raises the chance of a new, different cancer later in life, but for any one survivor that chance is small and most never develop one. The risk comes from earlier chemotherapy, radiation and lowered immunity, and it lasts for years. This page explains which second cancers occur, what raises your risk, and the simple checks that find problems early. At CION Cancer Clinics, our haematology team assesses whether a transplant or CAR-T fits your situation and coordinates care with qualified centres.
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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
- Does a bone marrow transplant raise the risk of another cancer?
- Which second cancers can happen after a transplant?
- What makes a second cancer more likely for you?
- Which checks help find a second cancer early?
- Which changes should you mention to your team?
- What do families get wrong about second cancers?
- What can this page not tell you?
- Common questions about second cancers after transplant
The short answer
Does a bone marrow transplant raise the risk of another cancer?
Yes. People who have had a bone marrow transplant have a higher chance of developing a new, different cancer later in life than people of the same age who have not. For any one survivor that chance is still small, and most never develop a second cancer.
What "second cancer" means
A second cancer is a new cancer. It is not the original leukaemia, lymphoma or myeloma coming back. That is called relapse, and it is a different problem with a different plan. A second cancer starts in another kind of cell, sometimes in another part of the body, and it is caused partly by the treatment that controlled the first disease.
Why the risk rises
High-dose chemotherapy and radiation damage healthy cells as well as cancer cells. A few of those damaged cells can go on to become cancerous years later. After an allogeneic transplant (a transplant from a donor), the medicines that calm the new immune system also weaken its ability to spot and clear abnormal cells.
Why it keeps mattering for years
Some second cancers appear within the first year or two. Others, such as skin and solid cancers, can appear a decade or more later. The risk does not fade to nothing with time, which is why follow-up does not end when the transplant unit discharges you.
Knowing the risk is useful because many second cancers are found early by simple checks you can keep up for life.Three groups
Which second cancers can happen after a transplant?
Doctors usually sort them into three groups. They differ in when they appear and what drives them.
New blood cancers
Earlier chemotherapy can damage the marrow so that a new blood disorder develops. Your report may call it therapy-related myelodysplastic syndrome or therapy-related AML.
Seen more often after
- Autologous transplant (your own cells)
- Several earlier lines of chemotherapy
PTLD
Post-transplant lymphoproliferative disorder is a lymphoma-like growth, usually driven by the Epstein-Barr virus while immunity is low. It tends to appear in the first year after a donor transplant.
Many teams check blood for this virus in the early months.Solid cancers
These appear later and keep rising slowly with time. They include cancers of the skin, mouth, throat, thyroid, breast, bone and brain.
Linked most with
- Total body irradiation
- Chronic graft-versus-host disease
- Tobacco in any form
Not sure whether this applies to you?
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What makes a second cancer more likely for you?
The risk is not the same for every survivor. A few things push it up, and a few are within your control.
Things you cannot change
Radiation given as part of the transplant, especially total body irradiation, raises the long-term risk of solid cancers. Being young at the time of radiation matters too, because growing tissue is more sensitive. Long-lasting chronic graft-versus-host disease, and the immune-lowering medicines needed to control it, are linked with cancers of the skin and mouth. The number of treatments you had before transplant also counts.
Things you can change
Tobacco is the biggest. Smoking, beedi, gutka, khaini and paan with tobacco all add to an already raised risk of mouth and throat cancer. Alcohol adds to it again. Strong sun on skin that has had radiation or GVHD raises the risk of skin cancer, so cover up and use sunscreen outdoors.
Who this page matters most to
If you had TBI, chronic GVHD, or you were a child or young adult at transplant, the checks below are especially important for you.
Never stop or reduce an immune-lowering medicine on your own because of cancer worry. Your haematologist balances that risk against GVHD.Checks to keep up
Which checks help find a second cancer early?
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Blood counts at every follow-up
A change in counts can be the first clue to a new blood disorder. Keep your follow-up blood tests even when you feel well.
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Look inside your mouth each month
Use a mirror and good light. Look for white or red patches, ulcers that do not heal, or lumps. Have your mouth examined at every dental visit, and tell the dentist about your transplant.
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Check your skin
Watch for new moles, moles that change, and sores that bleed or do not heal. A skin doctor review is sensible after TBI or skin GVHD.
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Breast checks for women who had radiation
Women who had TBI or chest radiation may be advised to begin breast screening earlier than usual. Ask your team when yours should start.
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Cervical screening and neck checks
Keep up regular cervical screening. Your doctor may also feel your neck for thyroid lumps at yearly reviews.
What to report
Which changes should you mention to your team?
What you notice
What to do
A mouth ulcer or patch that has not healed
Show a doctor or dentist soon, not at the next routine visit
New lumps in the neck, armpit or groin, or night sweats
Tell your haematologist within days
Unusual tiredness, bruising or repeated infections
Ask for a blood count check
A mole or skin sore that changes, bleeds or grows
Arrange a skin review
A breast lump or change in the nipple or skin
See a doctor promptly for a proper examination
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Commonly believed
What do families get wrong about second cancers?
"If the transplant worked, we can stop the check-ups."
A successful transplant is exactly why long-term follow-up matters. The late effects of treatment, including second cancers, can take many years to appear. Skipping reviews is how an early, treatable problem turns into a late one.
"Any new lump means the old cancer has spread."
Not necessarily. A new lump may be harmless, may be an infection, or may be a separate cancer that needs its own treatment. Only tests, and often a biopsy (a small tissue sample), can tell which. Guessing either way delays the right answer.
"Chewing gutka is safer than smoking, so it is fine."
Smokeless tobacco is a major cause of mouth cancer, and transplant survivors, especially those with GVHD in the mouth, already carry a raised risk. Every form of tobacco is worth giving up.
"Knowing about second cancers will only make us afraid."
Most survivors never develop one. Knowing which checks to keep up turns a vague fear into a short, practical list, and gives you something to do rather than something to worry about.
Being straight with you
What can this page not tell you?
This page cannot put a number on your own risk. That depends on your original disease, the kind of transplant, whether radiation was used, your age at the time, GVHD, and your habits. Your haematologist, with your full treatment record, is the person who can say how your risk compares.
What a second cancer means for treatment
If a second cancer is found, it is treated as a cancer in its own right. Options depend on its type and stage, and on what your body has already been through. Some treatments may not suit you because of earlier radiation or damage to the heart, lungs or kidneys. A team that knows your transplant history should be part of that decision.
How the CION team helps
CION's haematology team reviews your transplant summary, sets out which late-effect checks you need, and coordinates referral to the right specialist when something is found. Complex cases are discussed at a tumour board, where several specialists agree the plan together. Bring your transplant discharge summary and any recent reports to the first visit.
Questions we are asked
Common questions about second cancers after transplant
Is a second cancer the same as relapse?
No. Relapse means the original blood cancer has come back. A second cancer is a new and different cancer, starting in other cells. The tests, the treatment and the specialists involved are often different. Your report will make clear which one it is, and your haematologist can explain the difference for your case.
Does an autologous transplant carry the same risk as a donor transplant?
The pattern differs. After an autologous transplant (using your own cells), new blood disorders linked to earlier chemotherapy are the bigger concern. After a donor transplant, PTLD in the first year and skin and mouth cancers linked to GVHD matter more. Both groups need long-term follow-up.
Should I have a PET-CT every year to be safe?
Usually not. Routine scans in people with no symptoms tend to find harmless things that lead to more tests, and they add radiation. Simple checks of blood, skin, mouth and breasts, plus prompt reporting of new symptoms, are the usual approach. Your team will order scans when there is a reason.
My child had a transplant. What should we watch for as they grow?
Children who had radiation have the longest lifetime ahead for late effects to appear, so lifelong follow-up matters. Keep every review, teach them to check their skin and mouth as teenagers, and make sure future doctors know about the transplant. Keep a copy of the treatment summary safe for adult care.
Can diet or supplements prevent a second cancer?
No supplement has been shown to prevent second cancers after transplant, and some can interact with your medicines. A balanced diet, staying active and a healthy weight help your general health. Avoiding tobacco and limiting alcohol make the clearest difference. Ask before taking any supplement.
Does the donor's marrow cause the second cancer?
Very rarely a blood cancer can arise in the donor cells, but this is uncommon. Most second cancers come from the effects of earlier treatment on your own tissues, or from lowered immunity. Tests on the new cancer can show which cells it came from if that question matters.
Does GVHD in the mouth raise my risk of mouth cancer?
Long-lasting GVHD in the mouth is linked with a higher risk of mouth cancer. That does not mean it will happen. It means regular mouth examinations are worth keeping up, any sore that does not heal should be checked, and tobacco in every form is worth avoiding entirely.
Who should I tell about my transplant history?
Every doctor and dentist you see, for the rest of your life. Keep a short written summary: your diagnosis, the type of transplant, whether radiation was given, and any GVHD. It helps a doctor who has never met you choose the right checks quickly.
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Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Sources
- National Cancer Institute — Stem Cell Transplants in Cancer Treatment
- American Cancer Society — Second Cancers in Adults
- Leukemia & Lymphoma Society — Stem Cell Transplantation
- National Cancer Institute — Late Effects of Treatment for Childhood Cancer (PDQ)
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.
Keep reading
Related pages
Bone marrow transplant guideThe main guide to how a transplant worksRelapse After Transplant: What Options RemainWhen the original disease comes back insteadLong-Term Follow-Up Schedule After TransplantWhen each late-effect check usually happensLife After TransplantThe full guide to recovery after a transplant
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Not sure which checks you need after your transplant?
Share your transplant summary with us. CION's haematology team will review it and help you plan long-term follow-up with the right specialists.