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CION Cancer Clinics
Testing your family for an MEN1 fault | CION Cancer Clinics
Once one person in a family is found to carry an MEN1 fault, their parents, brothers, sisters and children can be tested for that exact change. The test is a simple blood sample and the answer is usually a clear yes or no. Unlike many inherited faults, MEN1 testing is often offered in childhood. This page explains who to test, in what order, and what each result means. At CION Cancer Clinics, our oncologists explain what a gene result means for you and your family, and plan the checks that follow.
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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
- Who in the family should be tested for MEN1?
- Which relatives should be offered a test, and why?
- What actually happens when a relative is tested?
- What do the family testing terms mean?
- What does each result mean for a relative?
- What do families believe about MEN1 testing that is not true?
- What can this page not tell you?
- Common questions about testing the family for MEN1
The short answer
Who in the family should be tested for MEN1?
Every parent, brother, sister and child of someone with a confirmed MEN1 fault should be offered a test. Each of them has a one in two chance of carrying it. The test looks only for the family's exact fault, uses a simple blood sample, and gives a clear yes or no.
Start with the person who has MEN1
Relatives can only be tested for a fault that has already been found. So the first step is a copy of the original report, showing the exact variant, from the person who was tested first. Without it, the laboratory does not know what to look for.
Then work outwards, one branch at a time
Close relatives come first. When one of them tests positive, their own children and brothers and sisters are offered a test next. This is called cascade testing. It moves through a family the way the fault did, and it stops on any branch where the result is negative.
Why MEN1 is different about children
For many inherited faults, testing waits until a child is an adult. MEN1 is one of the exceptions. Some pancreas and pituitary growths can appear in childhood, so testing is usually offered early, and checks start only in children who carry the fault.
Who to ask
Which relatives should be offered a test, and why?
The order matters less than making sure nobody is left out, including the men in the family.
Parents
Testing both parents shows which side of the family the fault came from. That tells you which aunts, uncles and cousins are at risk. If neither parent carries it, the fault is probably new in you.
Brothers and sisters
If a parent carries the fault, each brother and sister has a one in two chance of carrying it too. Being well today does not rule it out, because many carriers have no symptoms for years.
Children
Each child of a carrier has a one in two chance. MEN1 testing is usually offered in early childhood, with the parents deciding and the counsellor guiding.
A negative child
- Needs no MEN1 checks
- Cannot pass the fault on
The wider family
Once the carrier parent is known, their brothers, sisters and cousins on that side are offered testing in turn. Relatives on the other side do not need it.
Not sure whether this applies to you?
Ask an oncologistHow it works
What actually happens when a relative is tested?
Get the original report
The relative brings a copy of the first report, or a family letter naming the exact variant. The counsellor checks the fault is classed as pathogenic, meaning known to cause MEN1.
A conversation before the test
A counsellor explains what a positive and a negative result would mean, in Telugu if preferred. For a child, the parents make the decision with the counsellor's help.
One sample, one variant
A blood or saliva sample is tested for that single variant only. This is simpler and usually cheaper than the full gene test the first person needed.
The result, and what follows
A positive relative starts baseline tests and a check plan. A negative relative needs no MEN1 checks, and neither do their children.
Words you will hear
What do the family testing terms mean?
- Index case
- The first person in the family found to carry the fault. Their report is the key for everyone else.
- First-degree relative
- A parent, brother, sister or child. Each shares half their genes with you.
- Cascade testing
- Offering the test branch by branch, starting closest to the index case.
- Predictive test
- A test in someone who is well, to find out whether they carry the family's fault before any problem appears.
- Single-site test
- A test for one known variant only, instead of reading the whole gene.
- Phenocopy
- A relative with an MEN1-like problem, such as a parathyroid growth, who does not carry the family's fault. It is a one-off, not MEN1.
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Side by side
What does each result mean for a relative?
Tests positive
Tests negative
Starts baseline tests and lifelong checks
Needs no MEN1 checks at all
Each of their children has a one in two chance
Their children are not at risk from this fault
Their own brothers and sisters are offered a test
Testing stops on this branch
Receives a family letter to share onward
Any gland symptoms are checked in the usual way
Commonly believed
What do families believe about MEN1 testing that is not true?
"Only relatives with symptoms need testing."
Carriers can feel well for years while a silent growth develops. Testing well relatives is the point, because it lets checks start before trouble does.
"Children should wait until they are adults."
That is true for many inherited faults, but not MEN1. Some growths can appear in childhood, so early testing lets a carrier child be checked and a non-carrier child be left alone.
"If I test negative, my children should still be tested."
A negative result for the family's exact fault means you cannot pass it on. Your children do not need testing for it.
"We marry within the family, so everyone is at risk."
MEN1 passes from a carrier parent to a child. Marrying within the family does not change the one in two chance, though the fault can turn up on both sides of the tree. Your counsellor will trace both.
Being straight with you
What can this page not tell you?
It cannot tell you which of your relatives carries the fault, or decide for you whether and when to test a child. Those are conversations for a genetic counsellor who knows your family tree. What your specific variant means is a question for the counsellor who ordered the test.
It cannot make relatives agree
Every adult has the right to decide whether to be tested, and some will say no, at least at first. A counsellor can help you share the information, and the family letter lets relatives act on it later, in their own time and in their own city.
Who this does not apply to
If the person with MEN1-like problems had a gene test that found no fault, relatives cannot be offered this test, and need clinical checks instead. Spouses and in-laws are not at risk. Relatives on the side of the family the fault did not come from do not need testing.
Questions we are asked
Common questions about testing the family for MEN1
At what age should children be tested for MEN1?
Usually in early childhood, because some pancreas and pituitary growths can appear before the teenage years and checks only help if they start in time. The exact age is agreed with your counsellor and endocrinologist, and it can be timed around school and family plans.
Can relatives in another city or state be tested there?
Yes. With the family letter and a copy of the original report, a relative can see a counsellor near where they live. Many laboratories also accept saliva kits by courier. Nobody needs to travel to Hyderabad just for the test.
Is a relative's test cheaper than the first test?
Usually. The first person needed the whole gene read, while relatives are tested for one known variant. Some laboratories offer family testing at a lower rate if the first test was done with them. Ask before booking.
The person with MEN1 has died. Can we still test the family?
If their report still exists, yes. If not, a stored tissue block from an old operation can sometimes be tested. Otherwise a close living relative with MEN1-like problems may need the full gene test first. A counsellor will work out the best route.
Do I have to tell my relatives myself?
Usually the family hears it from you, but you do not have to find the words alone. Your counsellor can write a family letter that explains the fault, the chance of carrying it and how to get tested. Many people forward it on WhatsApp.
If I test negative, do I need any checks?
Not for MEN1. A negative result for the family's exact fault means you did not inherit it. You should still see a doctor about any new symptom in the ordinary way, as anyone would, but no special MEN1 schedule applies.
Can the test show which parent passed it on?
Yes, if both parents are tested. Only the carrier parent will test positive. If neither does, the fault most likely arose new in the child, and the parents' other children are at very low risk.
What if a relative refuses to be tested?
That is their right. Give them the family letter and let them know the offer stays open. Some people come back to it years later, often when they are planning a family or when a doctor finds high calcium on a routine test.
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 1
- MedlinePlus Genetics — Multiple endocrine neoplasia
- National Cancer Institute — Genetic Testing for Inherited Cancer Susceptibility Syndromes
- NHS — Predictive genetic tests for cancer risk genes
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
Surveillance for MEN1 carriersThe checks a relative who tests positive will startMEN1 testing cost in HyderabadWhat a relative's test usually costsTested positive for MEN1: what happens nextThe first year after a positive result, step by stepHow cascade testing worksHow testing moves through a family, branch by branch
Talk to us
Need help explaining MEN1 to your relatives?
Tell us who in the family has been tested and who has not. We can arrange counselling, a family letter and testing for relatives, in Telugu if you prefer. One helpline serves every CION centre.