Medical Oncologist
CION Cancer Clinics
The age for preventive thyroid surgery in MEN2 | CION Cancer Clinics
In MEN2, removing the thyroid before cancer forms is the most reliable way to protect a child. The right age depends on the exact RET gene change. For the highest-risk change it is within the first year of life, and for others it is later in childhood, guided by blood tests. This page explains how the timing is decided, what happens before surgery, and what life looks like afterwards. At CION Cancer Clinics, our oncologists plan screening and care for families with an inherited cancer syndrome, explained in plain words.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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On this page
- When should a child with MEN2 have the thyroid removed?
- How do doctors decide the right age for surgery?
- What happens between the RET result and the operation?
- The words you will meet, in plain language
- What changes if surgery is done early or late?
- Four things parents often think, and what is actually true
- What this page cannot tell you
- Common questions about preventive thyroid surgery in MEN2
The short answer
When should a child with MEN2 have the thyroid removed?
It depends on the exact change in the RET gene. For the highest-risk change, seen in MEN2B, surgery is advised in the first year of life. For high-risk changes it is usually done by about the age of five. For moderate-risk changes the timing is guided by regular blood tests, and surgery may come later in childhood.
Why remove a thyroid that seems healthy
Almost everyone who carries a MEN2 change in the RET gene develops medullary thyroid cancer at some point. This cancer starts in the C cells of the thyroid and does not respond well to radioiodine or standard chemotherapy. Removing the thyroid before a cancer forms, or while it is still tiny and confined to the gland, is the most reliable way to prevent it from spreading.
Why the exact change sets the clock
Different RET changes cause cancer at very different ages. Some start in infancy. Others may not cause cancer until adult life. That is why the genetic report names the specific change, and why two families with MEN2 can be given very different timings for their children.
The aim is to operate before the cancer has had a chance to spread, without operating earlier than the child's change requires.What decides the timing
How do doctors decide the right age for surgery?
Guidelines group RET changes by risk. The group your child's change falls in sets the starting point, and blood tests and scans fine-tune it.
Highest risk
The change behind most MEN2B. Cancer can begin in the first months of life, so surgery is advised within the first year, ideally by a surgeon experienced with infants.
Many MEN2B children have no family history, which is why the physical signs matter so much.High risk
Includes the common change at codon 634 in MEN2A. Surgery is usually planned by about the age of five, and earlier if blood calcitonin is already rising.
Moderate risk
Most other MEN2A changes. Children have regular calcitonin tests and neck ultrasound from early childhood. Surgery is planned once calcitonin starts to rise.
Some families choose earlier surgery
- If regular testing is hard to keep up
- If travel to a specialist centre is difficult
The blood tests and scan
Calcitonin, a hormone made by the C cells, is the key marker. A neck ultrasound looks for lumps and enlarged glands. Together they show whether the timetable needs to move.
Not sure whether this applies to you?
Ask an oncologistFrom result to operation
What happens between the RET result and the operation?
The result is confirmed
A counsellor confirms the exact RET change, the risk group it falls in and whether the child's parents and siblings also need testing.
Baseline tests
Blood calcitonin and CEA are measured, and the neck is scanned by ultrasound. These show whether any cancer may already be present.
Checks before any surgery
In older children and adults, a phaeochromocytoma, an adrenal tumour that releases stress hormones, must be ruled out first. Calcium levels are checked for overactive parathyroid glands.
Surgery with an experienced team
The whole thyroid is removed by a surgeon who does this operation often, ideally one used to operating on children.
Life afterwards
Your child takes a daily thyroid hormone tablet for life, and has calcitonin checked at intervals to confirm nothing has been left behind.
On your report
The words you will meet, in plain language
- RET gene
- The gene behind MEN2. A change in it keeps a growth signal switched on in thyroid C cells and the adrenal glands.
- Codon
- A small position within a gene. Reports name the codon because the position of the change predicts how early cancer can start.
- Medullary thyroid cancer
- A cancer of the thyroid's C cells. It behaves differently from the more common thyroid cancers and needs different treatment.
- Calcitonin
- A hormone made by C cells. A rising level is the earliest sign that C cells are multiplying.
- Total thyroidectomy
- Removal of the whole thyroid gland. Leaving part of it behind would leave C cells that could still become cancer.
- Parathyroid glands
- Four tiny glands beside the thyroid that control calcium. Protecting them during surgery is a key part of the surgeon's job.
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What changes if surgery is done early or late?
Surgery at the advised age
Surgery after a delay
Cancer is unlikely to have started
Cancer may already be present
Neck lymph glands rarely need removing
Wider neck surgery may be needed
Calcitonin usually falls to normal afterwards
Calcitonin may stay raised, needing more follow-up
Follow-up is simpler and lighter
Follow-up is longer and closer
Commonly believed
Four things parents often think, and what is actually true
"My child is well and has no lump, so we can wait."
Medullary thyroid cancer causes no symptoms early on. By the time a lump can be felt, it has often spread to the neck glands. Waiting for a sign is exactly what the timetable is designed to avoid.
"Without a thyroid, my child will never be healthy."
A daily thyroid hormone tablet replaces what the gland made. Children on the right dose grow, learn and play normally. The dose is adjusted with regular blood tests as they grow.
"It is a small operation, so any hospital will do."
In a young child the parathyroid glands and the nerves to the voice box are tiny. An experienced surgeon lowers the chance of lasting low calcium or voice change. Experience matters more here than distance.
"My parent carries it but never had cancer, so my child is safe."
A parent may have had an undiagnosed cancer, or had surgery without it being linked to MEN2. The child's risk comes from the RET change they carry, not from how the parent's illness looked.
Being straight with you
What this page cannot tell you
It cannot set the date for your child. The right age depends on the exact RET change, on your child's calcitonin results and on the experience of the surgical team available to you. Those decisions belong to your endocrine surgeon, your child's specialist and your genetics team, working together with you.
It cannot interpret your child's report
RET reports name a specific change, and some rarer changes have less evidence behind them. What your child's specific variant means is a question for the counsellor who ordered the test. A variant of uncertain significance is not a reason for surgery on its own.
Who this does not apply to
This page is about MEN2 and RET changes only. It does not apply to MEN1, which affects different glands and does not call for thyroid removal. It does not apply to the common thyroid nodules and cancers seen in the general population, which are not caused by RET and are managed quite differently.
Questions we are asked
Common questions about preventive thyroid surgery in MEN2
Is removing a healthy thyroid really necessary?
For almost everyone with a MEN2 RET change, yes. The chance of medullary thyroid cancer is so high that surgery is considered the standard of care. The question is when, not whether. For moderate-risk changes, careful monitoring can safely delay surgery for some years.
What are the main risks of the operation?
The two to understand are low calcium, if the parathyroid glands are affected, and a change in the voice, if a nerve to the voice box is affected. Both are uncommon with an experienced surgeon, and many cases are temporary. Your surgeon will explain their own results.
Will my child need medicine for life?
Yes, a daily thyroid hormone tablet. It is inexpensive, widely available and taken once a day. Blood tests guide the dose. If the parathyroid glands are affected, calcium and vitamin D tablets may also be needed.
We found out late. Is it too late for surgery?
No. Surgery is still advised, but the team will first check calcitonin, CEA and a neck scan to see whether cancer is already present. If it is, the operation may be wider. Many children and adults diagnosed late still do well.
Why check the adrenal glands before thyroid surgery?
MEN2 can cause a phaeochromocytoma, which releases stress hormones. If it is missed, the anaesthetic and surgery can cause a dangerous rise in blood pressure. In older children and adults it must be ruled out first, and removed first if found.
Should my other children be tested?
Yes. In MEN2, testing children is recommended early, because surgery timing depends on it. Each child of a carrier has a one in two chance of inheriting the change. Children who test negative need no thyroid surgery and no MEN2 checks.
Can an adult carrier still have the surgery?
Yes. Adults found through family testing should have calcitonin, CEA and a neck ultrasound, followed by thyroid removal. The extent of surgery depends on whether cancer is already present. Age is not a reason to skip it.
Where do I start?
Bring the RET report and any calcitonin results to a genetic counsellor or endocrine specialist. Ask which risk group the change falls in and what timing that suggests. The CION helpline can point you to the right clinic.
Your Specialists
Meet CION's oncologists. Bring your family history or genetic report to them.
Our medical oncologists see people with a strong family history of cancer, arrange genetic counselling and testing where it fits, and plan the checks that follow.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
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Sources
- GeneReviews (NCBI) — Multiple Endocrine Neoplasia Type 2
- National Cancer Institute — Genetics of Endocrine and Neuroendocrine Neoplasias (PDQ) - Health Professional Version
- MedlinePlus Genetics — Multiple endocrine neoplasia
- MedlinePlus — Calcitonin Test
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
Calcitonin and CEA monitoringThe blood tests that fine-tune the timingPhaeochromocytoma screening before surgery in MEN2The check that must come before any operationMEN2B physical features and early diagnosisThe signs that let MEN2B be spotted in a young childMEN surveillance through childhood and adolescenceWhat checks a carrier child has, year by year
Talk to us
Has your child been found to carry a RET change?
Send us the RET report and any calcitonin results. We will help you understand which risk group applies and arrange a review with the right specialists. One helpline serves every CION centre.