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MAX and TMEM127: what these genes do and why they matter | CION Cancer Clinics
MAX and TMEM127 are two genes that help stop cells in the adrenal glands from growing when they should not. A fault in either one, present from birth, raises the chance of a phaeochromocytoma, a usually non-cancerous tumour that makes stress hormones. This page explains what the two genes normally do, what changes when one is faulty, and what a positive result does and does not mean. 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
- What do the MAX and TMEM127 genes actually do?
- How are MAX and TMEM127 different from each other?
- How does a faulty brake gene lead to a tumour?
- The words you will meet, in plain language
- A fault found, compared with no fault found
- Four things families tell us, and what is actually true
- What this page cannot tell you
- Common questions about MAX and TMEM127
The short answer
What do the MAX and TMEM127 genes actually do?
Both genes act as brakes on cell growth. When one of them is faulty from birth, cells in the adrenal glands can grow when they should not and form a tumour called a phaeochromocytoma. Most of these tumours are not cancer, but they make stress hormones that can push blood pressure dangerously high.
Two different brakes
MAX makes a protein that pairs with another protein called MYC. MYC switches on growth, and MAX helps keep that switch under control. TMEM127 makes a protein that sits on tiny sacs inside the cell and helps control a growth signal called mTOR. Different jobs, but the result of a broken copy is similar: a cell that loses one of its checks.
Why doctors look for them
A phaeochromocytoma is one of the tumours most likely to be inherited. That is why many specialists now offer genetic testing to everyone who has one. MAX and TMEM127 are two of the genes on that test, alongside better known ones such as RET, VHL, NF1 and the SDH genes. A fault in either one explains the tumour and tells the family who else to check.
A fault in either gene raises risk. It is not a diagnosis of cancer.Side by side
How are MAX and TMEM127 different from each other?
They are usually tested together and talked about as a pair. In families they behave a little differently.
MAX
Tumours linked to MAX usually grow in the adrenal glands and often affect both sides, sometimes years apart. They can appear in young adults.
Often looks like
- Tumours in both adrenal glands
- A first tumour in early adult life
- Occasionally a tumour outside the adrenal
TMEM127
Tumours linked to TMEM127 are usually in one adrenal gland and are often found in middle age. Many people who carry the fault never develop a tumour at all.
Often looks like
- One adrenal gland affected
- Found later in adult life
- Rarely spreads beyond the gland
Which parent it came from
Early reports suggested MAX tumours appear mainly when the fault came from the father. The studies are small and the pattern is not firm, so relatives on both sides are still offered testing.
Other tumours reported
A few MAX carriers have had pituitary tumours, and a few TMEM127 carriers have had kidney cancer. These links rest on small numbers of families, so extra checks are decided case by case.
Not sure whether this applies to you?
Ask an oncologistFrom gene to tumour
How does a faulty brake gene lead to a tumour?
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You inherit one faulty copy
Everyone has two copies of each gene, one from each parent. A carrier is born with one working copy of MAX or TMEM127 and one broken copy, in every cell of the body.
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One working copy is usually enough
For years nothing happens. The working copy keeps the adrenal cells behaving normally, and most carriers feel completely well.
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The second copy is lost in one cell
By chance, the working copy can be damaged in a single adrenal cell. That cell now has no brake on its growth signal.
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The cell grows and makes hormones
The tumour that forms makes adrenaline and noradrenaline. These can cause bouts of pounding headache, sweating and a racing heart, or simply high blood pressure that is hard to control.
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Which is why risk is not certainty
The inherited fault supplies only the first step. Whether the second step ever happens is partly chance, so two carriers in one family can have very different lives.
On your report
The words you will meet, in plain language
- Phaeochromocytoma
- A tumour of the inner part of the adrenal gland, which sits on top of the kidney. It makes stress hormones. Most are not cancer.
- Paraganglioma
- The same kind of tumour growing outside the adrenal gland, along the chain of nerve tissue in the belly, chest or neck.
- Metanephrines
- Breakdown products of stress hormones. They are measured in blood or urine to check whether a tumour is making hormones.
- Tumour suppressor gene
- A gene whose normal job is to act as a brake on growth. MAX and TMEM127 are both of this kind.
- Germline
- Present in every cell from birth, and so able to pass to children. A fault found only inside the tumour is called somatic.
- Penetrance
- How often a fault actually leads to a tumour across everyone who carries it. For both genes it is well below all carriers.
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What a result changes
A fault found, compared with no fault found
A MAX or TMEM127 fault is found
No fault is found
The other adrenal gland is watched for a new tumour
Follow-up is planned on the tumour that was removed
Blood relatives can be tested for that exact fault
Relatives are guided by the family history instead
Surgeons may try to keep part of the adrenal gland
Standard adrenal surgery is usually planned
Carriers who are well get a checking plan
Routine care for blood pressure applies
Commonly believed
Four things families tell us, and what is actually true
"It was only a blood pressure tumour, so genes do not come into it."
These tumours are among the most often inherited of all tumours. A single one, even in an older adult, can be the first sign of a family fault. That is why testing is offered widely.
"The tumour has been removed, so the gene problem has gone."
Surgery removes the tumour, not the fault. The fault is in every cell, so the other adrenal gland can still grow a new tumour. That is the reason for follow-up checks after surgery.
"My father never had a tumour, so he cannot be the carrier."
Many carriers of both genes live their whole lives without a tumour. A parent can carry and pass on the fault while staying well, so only a test settles who carries it.
"A TMEM127 result means I will get kidney cancer."
A link has been seen in a small number of families. The size of any extra risk is not known. Your specialist will say whether any kidney checks make sense for you.
Being straight with you
What this page cannot tell you
It cannot tell you what your own result means. MAX and TMEM127 are rare genes, and many changes found in them are classed as uncertain. What your specific variant means is a question for the counsellor who ordered the test. A search engine cannot answer it.
The evidence is still thin
Both genes were linked to these tumours relatively recently. Most of what is known comes from small groups of families, many of them in Europe and North America. Figures for how often carriers develop a tumour vary between studies, and Indian data is very limited. Anyone who gives you a precise number is claiming more than the studies show.
Who this does not apply to
Most people with high blood pressure do not have a phaeochromocytoma, and most do not need this test. It is also not about a change found only in tumour tissue. That is a different test, covered on our targeted therapy pages. This page is about faults you are born with.
If you have a report in your hand, bring it to your appointment rather than reading the variant online.Questions we are asked
Common questions about MAX and TMEM127
Is a phaeochromocytoma a cancer?
Most are not. They are usually contained within the adrenal gland and are removed by surgery. A minority spread to other parts of the body, which is one reason carriers are followed up for years. Your specialist will explain what your own tumour showed.
Can a child inherit the fault from me?
Yes. Each child of a carrier has a one in two chance of inheriting it, whether the child is a son or a daughter. Inheriting it raises the chance of a tumour but does not make one certain. Your counsellor will explain when testing children makes sense.
Why was I offered testing after only one tumour?
Because these tumours are so often inherited, a single one is enough reason to test. The result can change how your surgery is planned, how closely the other gland is watched, and whether relatives need checks.
Are MAX and TMEM127 the same as the SDH genes?
No. They raise the risk of similar tumours, but they work through different signals. SDH faults more often cause tumours outside the adrenal gland and carry different risks. The same test panel usually looks at all of them together.
What symptoms should a carrier watch for?
Bouts of pounding headache, sweating and a racing heart, often together, are the classic sign. So is blood pressure that suddenly becomes hard to control. Tell your doctor about these rather than waiting for your next planned check.
Does a fault in the tumour mean I carry it too?
Not necessarily. A change can arise in the tumour alone and not be inherited. Only a blood or saliva test tells you whether the fault is in every cell. Ask your team which test was done if you are unsure.
Can lifestyle changes lower the risk?
No habit is known to stop these tumours forming. What protects you is finding a tumour early, while it is small and before its hormones cause harm. Keeping to your checks matters more than any diet.
Where can this testing be done in Hyderabad?
Several laboratories in Hyderabad offer panels that include both genes. The test works best when arranged through a genetic counsellor, who can choose the right panel and explain the result. Call the CION helpline and someone will guide 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)
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Sources
- GeneReviews (NCBI) — Hereditary Paraganglioma-Pheochromocytoma Syndromes
- MedlinePlus Genetics — MAX gene
- MedlinePlus Genetics — TMEM127 gene
- National Cancer Institute — Genetic Testing for Inherited Cancer Susceptibility Syndromes
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
MAX and TMEM127: which tumours and what riskHow likely a tumour is, and where it tends to growMAX or TMEM127 positive: what happens nextThe first steps after a positive resultTesting the family for MAX and TMEM127Who in the family to test, and in what orderWhy every phaeochromocytoma warrants genetic testingThe reason a single tumour is enough to test
Talk to us
Been told you carry a MAX or TMEM127 fault?
Bring your report and your family history, and we will help you understand what it means and who else should be checked. One helpline serves every CION centre.