Medical Oncologist
CION Cancer Clinics
CDK4, MITF and POT1 faults: which cancers, and how much risk | CION Cancer Clinics
All three genes raise the risk of melanoma, a cancer of the skin's pigment cells. A CDK4 fault raises it sharply, the common MITF change only modestly, and a POT1 fault has also been linked with some brain tumours and blood cancers. This page sets out what each gene adds, how your own risk is judged, and what the evidence cannot yet say. 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
- Which cancers do CDK4, MITF and POT1 faults raise?
- What does each gene add to the risk?
- How is your personal risk worked out?
- What do the words on the report mean?
- How does inherited melanoma look different?
- What can this page not tell you?
- What do families get wrong about these risks?
- Common questions about CDK4, MITF and POT1 risks
The short answer
Which cancers do CDK4, MITF and POT1 faults raise?
All three raise the risk of melanoma, a cancer of the skin's pigment cells. A CDK4 fault raises it sharply, an MITF fault only modestly. A POT1 fault raises melanoma risk too, and has also been linked with a few other cancers, including some brain tumours and a slow-growing blood cancer.
The size of the risk is not the same
These genes are grouped because they sit on the same melanoma panel. They are not equal. A CDK4 fault behaves much like the better-known CDKN2A gene, with melanoma often appearing in several relatives. The common MITF change is milder and on its own may never lead to cancer. POT1 sits in between, and its full range of risks is still being mapped.
Why figures online may not fit your family
Almost everything known comes from small studies of fair-skinned families in Europe, Australia and North America. Very few Indian families have been studied. Melanoma is less common in darker skin and often appears in different places, so risk numbers from abroad should be read with care.
A raised risk is not a diagnosis. Many carriers never develop melanoma.Gene by gene
What does each gene add to the risk?
Your report names one gene. Read the card for that gene, not all three.
CDK4
Very rare, found in only a small number of families worldwide. The melanoma risk is substantially raised, higher than the general population and similar to a CDKN2A fault.
Often seen with
- Melanoma in several relatives
- Many moles, some unusual-looking
- More than one melanoma in one person
MITF
One particular change in MITF raises melanoma risk modestly. Some studies also link it with kidney cancer. Evidence for other cancers is limited and not consistent.
A modest risk still counts. It is added to your skin type, moles and family history.POT1
Raises melanoma risk, and has been linked with other cancers in some families. Studies so far are small.
Linked in some families
- Glioma, a type of brain tumour
- Chronic lymphocytic leukaemia, a slow blood cancer
- Angiosarcoma, a rare blood-vessel tumour
- Thyroid cancer
What they are not known for
None of the three is an established cause of breast, bowel, ovarian or prostate cancer. If those run in your family, a different gene is more likely and your counsellor will look there.
Not sure whether this applies to you?
Ask an oncologistYour own risk
How is your personal risk worked out?
The gene and the exact change
Your report names the gene and the precise change. Some changes are well studied. Others have been seen in only one or two families, which makes the risk harder to state.
The family pattern
Who had melanoma, how many relatives, at what age and on which side. A family with several young cases carries more weight than a gene name alone.
Your skin and moles
Fair skin, many moles, unusual moles and past sunburn all add to the risk. A skin specialist looks at these during a full skin check.
A plan that fits the result
The counsellor and skin team combine all of this into one plan. For most carriers that means regular skin checks and sun protection, with extra tests only where the gene calls for them.
On your report
What do the words on the report mean?
- Melanoma
- A cancer of melanocytes, the cells that give skin its colour. It can start in a mole or in normal-looking skin.
- Acral melanoma
- Melanoma on the palms, soles or under a nail. It is the most common kind seen in Indian patients.
- Atypical mole
- A mole that looks unusual in size, shape or colour. Most are harmless, but many of them together raise melanoma risk.
- Penetrance
- How often a fault actually leads to cancer across everyone who carries it. It is higher for CDK4 than for MITF.
- Moderate-risk variant
- A change that raises risk a little rather than a lot. The common MITF change is one of these.
- Germline
- Present in every cell from birth and able to be passed to children. A fault found only in a tumour is called somatic.
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Side by side
How does inherited melanoma look different?
Pointing to an inherited gene
More typical of everyday melanoma
Melanoma in two or more close relatives
One person affected in the family
Diagnosed at a young adult age
Diagnosed later in life
More than one separate melanoma in one person
A single melanoma
Melanoma alongside brain or other rare cancers
No unusual cancers in the family
Being straight with you
What can this page not tell you?
It cannot give you a personal risk figure. Published figures vary from study to study and come from very different populations. A counsellor who knows your exact variant and your family tree can tell you far more than any number here.
It cannot read your report
Each gene can carry many different changes, and each is classified on its own evidence. What your specific variant means is a question for the counsellor who ordered the test.
Who this does not apply to
Most people do not need this test. A single melanoma in an older relative, or plenty of ordinary moles with no melanoma in the family, does not usually point to any of these genes. Testing a melanoma for faults that guide treatment is a different test, covered under targeted therapy. Melanoma of the eye is more often linked with a different gene, BAP1.
Studies of these genes in Indian families are small. Ask how firm any risk estimate is.Commonly believed
What do families get wrong about these risks?
"Indian skin cannot get melanoma."
It is less common, not impossible. In Indian patients it often starts on the soles, palms or under a nail, where the sun matters less. A carrier should check these places too.
"A POT1 fault means I will get every cancer on the list."
The list shows what has been seen in some families. Most carriers develop none of these cancers, and many develop only one. Your family pattern guides which checks make sense.
"MITF is only a small risk, so it can be ignored."
A modest gene risk still adds to moles, skin type and family history. Regular skin checks and sun protection are still advised, even if nothing more is needed.
"Melanoma only grows on skin that sees the sun."
Sunlight is one cause, but melanoma can appear on covered skin, the soles, the nails and inside the mouth. A full skin check looks everywhere.
Questions we are asked
Common questions about CDK4, MITF and POT1 risks
Which of the three genes carries the highest risk?
CDK4 raises melanoma risk the most, close to the level seen with CDKN2A. POT1 raises it clearly too. The common MITF change raises it only modestly. Your own risk also depends on your exact variant, your skin and your family history.
Does a POT1 fault mean I need brain scans?
Not automatically. There is no agreed screening programme for the other cancers linked with POT1. Your team may suggest some checks if the family has had a brain tumour or blood cancer. Ask what is advised for you and why.
Can an MITF fault cause kidney cancer?
Some studies link the common MITF change with kidney cancer as well as melanoma. The evidence is not strong enough for a fixed screening plan. Tell your doctor about kidney cancer anywhere in the family, and report blood in the urine promptly.
Can a man carry one of these genes?
Yes. Men and women carry and pass on these genes equally, and the melanoma risk applies to both. Each child of a carrier has a one in two chance of inheriting the fault, whether the parent is the mother or the father.
Are my children at risk?
Each child has an even chance of inheriting the fault. Melanoma in childhood is very rare even in carrier families. Children in a melanoma family should avoid sunburn and learn to check their skin, whatever their own result turns out to be.
Does sunscreen lower the risk if I carry a fault?
Avoiding sunburn protects your skin from extra damage, so shade, clothing and sunscreen all help. They do not remove the inherited risk, and they do little for melanoma on the soles or nails. Regular skin checks matter as much as protection.
Is melanoma common in India?
No, it is much less common than in fair-skinned countries. That is why it is often found late here. People assume a dark spot on the foot is a bruise or a corn. For a carrier, any new or changing spot deserves a look.
What should I do next?
Bring your report to a genetic counsellor or your oncologist, with a list of relatives who had melanoma or other cancers and their ages. They will explain your result and set up skin checks. The 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
- National Cancer Institute — Genetics of Skin Cancer (PDQ) – Health Professional Version
- MedlinePlus Genetics — MITF gene
- MedlinePlus Genetics — CDK4 gene
- Cancer Research UK — Risks and causes of melanoma
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
CDK4, MITF and POT1: what the genes doHow each gene works, before the risk figuresCDK4, MITF or POT1 positive: what happens nextThe checks that follow a positive resultTesting the family for CDK4, MITF and POT1Who else should be offered a testFamilial atypical multiple mole melanoma syndromeThe better-known melanoma gene pattern
Talk to us
Holding a report that names one of these genes?
Bring it, with a list of relatives who had melanoma or other cancers. We will explain what it means for you and set up the right skin checks. One helpline serves every CION centre.