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PTEN mutation: which cancers, and how much risk | CION Cancer Clinics
An inherited PTEN fault raises the risk of cancer of the breast, thyroid, womb lining and kidney, and to a lesser degree the bowel and skin. Breast cancer carries the highest risk for women. None of these cancers is certain. This page explains each risk in plain terms, when it tends to appear, and why the figures you find online often disagree. 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 does a PTEN fault raise the risk of?
- How much does each risk rise, in plain terms?
- When in life does each risk tend to appear?
- The words you will meet, in plain language
- Each risk, and how it is usually watched
- What this page cannot tell you
- Four things families tell us, and what is actually true
- Common questions about PTEN and cancer risk
The short answer
Which cancers does a PTEN fault raise the risk of?
An inherited PTEN fault raises the risk of cancer of the breast, the thyroid, the lining of the womb and the kidney, and to a lesser degree the bowel and the skin. Breast cancer carries the highest risk, and in women it is substantially raised. None of these cancers is certain, and many carriers never develop any of them.
Why one gene affects so many organs
PTEN is a brake on cell growth that works in almost every tissue. When one copy is faulty from birth, cells in many organs are a step closer to growing when they should not. Most of what grows is benign: lumps in the thyroid, polyps in the bowel, small bumps on the skin. A smaller share turns into cancer.
Why the risk figures you find online disagree
PTEN faults are rare, so risk estimates come from small groups of families. The earliest studies looked at families already full of cancer, which tends to push the numbers up. Later studies found lower figures. Treat any single percentage you read with caution. The pattern of which organs are affected is far more reliable than the exact size of the risk.
A PTEN fault is a statement about risk, not a diagnosis. The purpose of knowing is to watch the right organs early.Organ by organ
How much does each risk rise, in plain terms?
The organs below are listed from the highest risk to the lowest. Men and women share every risk except breast and womb.
Breast
The biggest risk for women carriers, substantially higher than the general population and often at a younger age. Men with PTEN have a small raised risk of breast cancer too.
Also common, and benign
- Fibrous or dense breast tissue
- Benign lumps that may need a biopsy to be sure
Thyroid
A clearly raised risk, usually of the follicular type, and it can occur in childhood. Benign thyroid nodules and an enlarged thyroid are far more common than cancer.
Womb lining
Women carriers have a raised risk of endometrial cancer, cancer of the lining of the womb. It tends to appear from middle age, and early warning comes from unusual bleeding.
Kidney, bowel and skin
Kidney cancer risk is raised, mainly in adult life. Bowel polyps are very common and bowel cancer somewhat raised. Melanoma, a skin cancer, is modestly raised.
Many bowel polyps in PTEN are benign growths called hamartomas.Not sure whether this applies to you?
Ask an oncologistAcross a lifetime
When in life does each risk tend to appear?
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Childhood
A larger than usual head size and skin signs may be noticed. Thyroid nodules can begin, and thyroid cancer, though uncommon, can occur. This is why thyroid checks begin in childhood for known carriers.
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Young adulthood
Thyroid risk continues. Benign breast changes and skin bumps become more noticeable. Breast screening for women starts well before routine screening would.
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Middle age
Breast cancer risk is at its most significant. Risk of cancer of the womb lining rises, and bowel polyps are often found on the first colonoscopy.
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Later adult life
Kidney cancer risk becomes more relevant, and bowel cancer and melanoma remain possible. Checks continue for as long as they help.
On your report
The words you will meet, in plain language
- PTEN hamartoma tumour syndrome
- The umbrella name for conditions caused by an inherited PTEN fault. You may see it shortened to PHTS.
- Cowden syndrome
- The best-known condition under that umbrella, recognised from a pattern of skin signs, benign growths and cancers.
- Hamartoma
- A benign, disorganised overgrowth of normal tissue. It is not a cancer and does not spread.
- Follicular thyroid cancer
- The type of thyroid cancer most linked to PTEN. It is usually treatable, especially when found early.
- Endometrium
- The lining of the womb. Endometrial cancer is cancer that starts in this lining.
- Lifetime risk
- The chance of developing a cancer at some point over a whole life. It is not the chance of it happening this year.
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Side by side
Each risk, and how it is usually watched
The risk
How it is usually watched
Breast
Yearly MRI and mammography, starting early
Thyroid
Ultrasound of the neck, from childhood
Womb lining
Prompt checks for unusual bleeding, sometimes more
Kidney
Periodic kidney imaging in adult life
Bowel and skin
Colonoscopy from the mid-thirties, and a yearly skin check
Being straight with you
What this page cannot tell you
It cannot give you your own number. Your risk depends on your sex, your age, the exact fault and what has happened in your family, and published estimates vary widely. A genetic counsellor can explain what the research suggests for someone in your position, and how certain it is.
It cannot tell you what your variant means
What your specific variant means is a question for the counsellor who ordered the test. Some PTEN changes are clearly harmful, and others are still uncertain.
Who this does not apply to
Most people do not need to worry about PTEN. A PTEN change found only inside a tumour, which is common in womb, prostate and brain tumours, is a different thing. It was not inherited and does not affect relatives. Those tumour changes are explained under targeted therapy.
What families in India should know
PTEN is often missed because the skin signs and a large head size are not linked to cancer. Tell the counsellor about thyroid disease, womb problems and breast lumps on both sides of the family, and about any child with a large head or developmental delay.
Commonly believed
Four things families tell us, and what is actually true
"PTEN is just another breast cancer gene."
Breast is the highest risk for women, but PTEN affects the thyroid, womb, kidney, bowel and skin too. A plan that watches only the breasts misses most of what the gene does.
"Men with PTEN have nothing to worry about."
Men share the thyroid, kidney, bowel and skin risks, and have a small raised breast cancer risk. They can also pass the fault to their children, whatever their own health.
"All these lumps will turn into cancer."
Most growths in PTEN carriers are benign and stay that way. They are watched because a few can change, and because a new lump needs checking to be sure it is one of the harmless kinds.
"The percentage I found online is my risk."
Online figures often come from early studies of families chosen because they had a lot of cancer. Your own risk may be lower. Ask your counsellor which figures apply to you.
Questions we are asked
Common questions about PTEN and cancer risk
Is the breast cancer risk with PTEN as high as with BRCA?
It is in a similar high range in several studies, which is why breast screening for PTEN carriers starts early and uses MRI. The estimates vary more than they do for BRCA, because far fewer families have been studied.
Can a child with PTEN get cancer?
Rarely, and when it happens it is usually thyroid cancer. That is why thyroid ultrasound starts in childhood for known carriers. Most other PTEN cancer risks do not become relevant until adult life.
Is PTEN linked to autism?
Some children with an inherited PTEN fault have autism or developmental delay, often alongside a large head size. That is not a cancer, but it is one reason a child's paediatrician may suggest PTEN testing.
Does a PTEN change in my tumour mean I have Cowden syndrome?
Not on its own. PTEN changes are common inside tumours and are usually not inherited. Only a blood or saliva test for an inherited fault answers that question. Ask your oncologist whether it is worth arranging one.
Can anything lower my risk?
Surveillance finds cancers early, when they are most treatable. Some women choose preventive breast or womb surgery, which is one option among several. Not smoking, keeping a healthy weight and protecting your skin from strong sun help too.
Do thyroid nodules mean thyroid cancer?
Usually not. Thyroid nodules are very common in PTEN carriers and most are benign. A nodule with worrying features on ultrasound is sampled with a fine needle to check.
My mother had breast and thyroid cancer. Should I be tested?
That combination is worth raising with a genetic counsellor. The best first step is usually to test your mother, if she is willing, because her result tells you whether there is a fault to look for.
Will a PTEN result affect my insurance?
India has no dedicated law on genetic discrimination in insurance. Raise it with your counsellor before testing, not afterwards. Some people choose to arrange health cover before they are tested.
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) — PTEN Hamartoma Tumor Syndrome
- MedlinePlus Genetics — Cowden syndrome
- National Cancer Institute — Genetics of Breast and Gynecologic Cancers (PDQ) – Health Professional Version
- MedlinePlus Genetics — PTEN gene
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.
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Not sure what your PTEN result means for you?
Bring your report and your family history, and a counsellor will explain which risks apply to you and how they are watched. One helpline serves every CION centre.