Medical Oncologist
CION Cancer Clinics
Positive for SMAD4 or BMPR1A: what happens next | CION Cancer Clinics
A positive SMAD4 or BMPR1A result starts a plan, not an emergency. You will be offered regular colonoscopy and stomach checks, with polyps removed as they are found, and SMAD4 carriers are also checked for HHT, a blood vessel condition. This page walks through the first months after the result, what it does and does not mean, and how your family fits in. 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
- I have tested positive for SMAD4 or BMPR1A. What happens now?
- What changes after a positive result?
- What usually happens, step by step?
- The words you will meet, in plain language
- What does a positive result mean, and not mean?
- What this page cannot tell you
- Four things people believe after a positive result
- Common questions after a SMAD4 or BMPR1A result
The short answer
I have tested positive for SMAD4 or BMPR1A. What happens now?
A positive result starts a plan, not an emergency. You will be offered regular colonoscopy and a camera test of the stomach, with any polyps removed as they are found. If the gene is SMAD4, you will also be checked for HHT, a blood vessel condition. Your relatives can then be offered a simple test for the same change.
If you already have polyps
For many people the result explains polyps or bleeding that have already been found. It confirms juvenile polyposis syndrome and moves you onto a proper surveillance schedule, instead of one-off tests. If you have had many polyps, your team may also talk about how best to keep them under control over the long term.
If you were tested because a relative carries it
You may have no symptoms at all. The result means you can start checks before any polyp causes trouble, which is the point of testing. Most carriers who are watched this way have polyps found and removed while they are small and harmless.
A positive result is a statement about risk. It is not a cancer diagnosis.Four things that begin
What changes after a positive result?
None of these has to happen in the first week. They are the parts of the plan your team will set up over the coming months.
Bowel and stomach checks
A colonoscopy and upper endoscopy, often on the same day, then repeated at intervals your gastroenterologist sets from what they find.
Usually includes
- Removing any polyps found
- A blood count for hidden bleeding
- Iron if the haemoglobin is low
HHT checks, if it is SMAD4
A bubble test of the heart looks for hidden blood vessel problems in the lungs. Some teams add a brain MRI or a heart scan. These are prevention, done even if you feel well.
Telling the family
Parents, brothers, sisters and children can be tested for your exact change. You will be given a letter to share, and help deciding who to approach first.
Each child of a carrier has a one in two chance of inheriting it.Practical matters
Keep copies of the report, ask about insurance before changing any policy, and plan how regular tests fit around work, school and travel from your district.
Not sure whether this applies to you?
Ask an oncologistThe first months
What usually happens, step by step?
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The result appointment
A genetic counsellor explains the result in person, answers questions and checks that the fault is classed as disease-causing. Bring someone with you if you can.
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Referral to a gastroenterologist
If you have not had recent scopes, you are referred for colonoscopy and upper endoscopy. If you have bleeding or tiredness, this is arranged sooner.
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The first scopes
Polyps are removed and sent to the laboratory. What is found sets the gap before the next test.
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HHT checks for SMAD4 carriers
The bubble test and any other scans advised are booked, often around the same time as the scopes to save journeys.
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A long-term plan
You leave with a written schedule for future tests, and your relatives are offered counselling and testing in their own time.
On your report
The words you will meet, in plain language
- Pathogenic variant
- A change known to break the gene. This is what a positive result means.
- Likely pathogenic
- A change that is very probably disease-causing. It is managed in the same way as a pathogenic variant.
- Variant of uncertain significance
- A change the laboratory cannot yet call harmful or harmless. It is not a positive result.
- Juvenile polyposis syndrome
- The inherited condition SMAD4 and BMPR1A faults cause, in which many polyps form in the gut.
- Germline
- Present in every cell from birth, and so inheritable, unlike a somatic fault found only in a tumour.
- Cascade testing
- Offering relatives a test for the fault already found in the family.
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Side by side
What does a positive result mean, and not mean?
It does mean
It does not mean
Your risk of bowel cancer is raised
You have cancer, or certainly will
Regular scopes are recommended for life
Surgery is needed straight away
Relatives can be tested for the same change
Every relative carries it
With SMAD4, blood vessel checks are needed
You will have serious bleeding problems
Being straight with you
What this page cannot tell you
It cannot tell you what your own schedule should be or how many polyps you are likely to have. That depends on your scopes, your gene and your family, and your team will adjust the plan as they learn more. Juvenile polyposis is rare, studies so far are small, and very few include Indian families.
It cannot read your result
What your specific variant means is a question for the counsellor who ordered the test. If your report says variant of uncertain significance rather than pathogenic, this page does not apply in the same way, and no screening or surgery should be based on it. Tumour testing for treatment choices is a separate question, covered under targeted therapy.
Who this does not apply to
If you tested negative for a fault already known in your family, you do not need any of this and can follow ordinary screening for your age. Most people who have had a polyp or two removed do not have juvenile polyposis and will never need this test.
Commonly believed
Four things people believe after a positive result
"I need to have my bowel removed now."
Most carriers are managed with regular scopes and polyp removal. Surgery is considered only if polyps are too many to control safely or cause heavy bleeding.
"I did something to cause this."
An inherited fault is present from birth. Nothing you ate or did caused it, and nothing a parent did caused it either.
"My children will definitely have it."
Each child has a one in two chance, and each child's chance is separate. Some families have several carriers. Others have none among the children.
"If I feel well, I can skip the checks."
Polyps usually cause no symptoms until they bleed. The checks exist to find them while you still feel well, when they are easiest to remove.
Questions we are asked
Common questions after a SMAD4 or BMPR1A result
How soon should I have my first colonoscopy?
If you have not had one recently, your team will usually arrange it within the next few months. If you have bleeding, black stools or unexplained tiredness, it should be sooner. Tell the clinic about any symptoms when you book, so they can prioritise you.
Does it matter whether it is SMAD4 or BMPR1A?
Yes. SMAD4 more often affects the stomach and can come with HHT, so SMAD4 carriers need stomach checks and blood vessel checks. BMPR1A mainly affects the bowel. Both need regular colonoscopy.
I already had bowel cancer. Does this change my treatment?
It can. The result may affect how much bowel a surgeon removes and how the remaining bowel and stomach are watched afterwards. Your oncologist and surgeon will take it into account alongside the tumour itself.
Who should I tell first?
Usually your parents and brothers and sisters, since they are most likely to be carriers, then your children. Your counsellor will give you a letter to share and can help you plan how to raise it, especially with older relatives.
Can I still get married and have children?
Yes. Carriers marry and have families. Each child has a one in two chance of inheriting the fault, and options such as testing in pregnancy exist. A counsellor can talk this through with you and your partner before you plan.
Will this affect my insurance?
India has no dedicated law on genetic discrimination, and the position is not settled. Ask your insurer's terms before changing any policy, and keep existing cover in place. A counsellor can help you think through what to disclose and when.
Is there a treatment for the gene itself?
No. A gene fault cannot be corrected or reversed. What changes the outlook is managing its effects: removing polyps, correcting a low haemoglobin and, for SMAD4, finding and treating hidden blood vessel problems before they cause harm.
Where can I get help setting this up?
Bring your report to a genetic counsellor or gastroenterologist who can coordinate the tests. Call the CION helpline if you are unsure who to approach, and someone will 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
Medical Oncologist
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Sources
- GeneReviews (NCBI) — Juvenile Polyposis Syndrome
- MedlinePlus Genetics — Juvenile polyposis syndrome
- National Cancer Institute — Genetics of Colorectal Cancer (PDQ®)–Health Professional Version
- MedlinePlus Genetics — BMPR1A 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.
Keep reading
Related pages
Surveillance for SMAD4 and BMPR1A carriersThe full schedule of checks, and how it changesTesting the family for SMAD4 and BMPR1AWho to tell, and who should be tested firstSMAD4 and hereditary haemorrhagic telangiectasiaThe blood vessel checks SMAD4 carriers needSMAD4 and BMPR1A cancer risksWhich cancers the result raises the risk of
Talk to us
Just received a SMAD4 or BMPR1A result?
Tell us what your report says and which tests you have had. We will help you set up the first scopes, any HHT checks and counselling for your family. One helpline serves every CION centre.