Medical Oncologist
CION Cancer Clinics
BLM, WRN or RECQL4 positive: what happens next | CION Cancer Clinics
What happens next depends on one thing: whether one copy of the gene is faulty or both. Two faulty copies mean Bloom, Werner or Rothmund-Thomson syndrome, and a lifelong care plan. One faulty copy usually means you are a carrier, and for most carriers little changes apart from family planning. This page explains both paths and who does what. 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 happens after a positive BLM, WRN or RECQL4 result?
- Which kind of positive result do you have?
- What usually happens in the weeks after a diagnosis?
- The words you will meet, in plain language
- One faulty copy versus two: what changes
- Four things families tell us, and what is actually true
- What this page cannot tell you
- Common questions after a positive result
The short answer
What happens after a positive BLM, WRN or RECQL4 result?
The first question is whether one copy of the gene is faulty or both. Two faulty copies mean a syndrome that needs a long-term care plan. One faulty copy usually means you are a carrier, and for most carriers very little changes.
Why the number of copies matters so much
Bloom, Werner and Rothmund-Thomson syndromes are recessive. The condition appears only when both copies of the gene are faulty. A person with one faulty copy and one working copy is a carrier, and carriers are usually healthy. Your report should say which of these applies. If it does not, ask.
How most adults find out today
Many adults now learn they carry one faulty copy by chance. It shows up on a wider gene panel ordered for a different reason, such as breast or bowel cancer in the family. That is a very different situation from a child diagnosed with a syndrome, and the next steps are much lighter.
A carrier result is not a diagnosis of Bloom, Werner or Rothmund-Thomson syndrome.Four different situations
Which kind of positive result do you have?
The word positive covers very different findings. Find the one that matches your report.
One faulty copy, found on a panel
You are a carrier. You do not have the syndrome. The main thing it affects is family planning, because a partner can be tested for the same gene.
Two faulty copies in a child
This usually confirms Bloom or Rothmund-Thomson syndrome in a child doctors already suspected. A care team is put together and a watching plan starts.
The team often includes
- A paediatrician who knows the syndrome
- A skin doctor, for sun damage and rashes
- A cancer specialist
Two faulty copies in an adult
This is most often Werner syndrome, which shows itself in young adult life. Care covers early ageing problems such as cataracts and diabetes, as well as cancer watching.
A fault found only in a tumour
A fault found only in tumour tissue is not inherited. That result belongs with your cancer team and the targeted therapy pages, not here.
Not sure whether this applies to you?
Ask an oncologistAfter a two-copy result
What usually happens in the weeks after a diagnosis?
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A counselling appointment to go through the report
The counsellor explains which syndrome it is and what it does. They check that both faults are clearly harmful, rather than uncertain.
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Both parents are usually tested
This confirms that one fault came from each parent. It also tells the family the chance of the same result in a future pregnancy.
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A care team and a watching plan are set up
The plan depends on the syndrome and on age. It may include kidney scans in early childhood for Bloom syndrome, bone checks for Rothmund-Thomson, and skin and thyroid checks for Werner.
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Every doctor is told about the diagnosis
Some of these syndromes make the body more sensitive to X-rays and to certain cancer medicines. Doctors may use ultrasound or MRI instead, and may adjust treatment if cancer ever develops.
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Brothers and sisters are offered testing
A sibling may have the same syndrome without a diagnosis yet. Finding it early means their watching plan can start too.
On your report
The words you will meet, in plain language
- Heterozygous
- One faulty copy and one working copy. For these genes this means carrier, not the syndrome.
- Biallelic
- Both copies of the gene carry a fault. This is the result that goes with the syndrome itself.
- Pathogenic variant
- A spelling change known to break the gene. "Likely pathogenic" means the evidence points the same way but is a little less certain.
- Variant of uncertain significance
- A change the laboratory cannot yet classify. It is not a positive result and should not change care.
- Surveillance
- Regular planned checks to find a problem early, before it causes symptoms.
- Germline
- Present in every cell from birth, and so inheritable. Somatic means a fault found only inside a tumour.
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Side by side
One faulty copy versus two: what changes
One faulty copy
Two faulty copies
You are a carrier and usually healthy
You have the syndrome, even if signs are mild
Screening usually follows your age and family history
A lifelong watching plan is made for you
X-rays and cancer treatment are not usually changed
Doctors may limit X-rays and adjust some medicines
Your partner can be tested before a pregnancy
Parents and siblings are offered testing
Commonly believed
Four things families tell us, and what is actually true
"My report says BLM positive, so I have Bloom syndrome."
Not unless both copies are faulty. Adults who learn this from a panel almost always have one faulty copy. People with Bloom syndrome are usually diagnosed in childhood because of their small size and a rash.
"Carriers need the same scans as people with the syndrome."
No. The watching plans are written for people with two faulty copies. For BLM carriers, studies on a small extra cancer risk have given mixed answers, and evidence for WRN and RECQL4 carriers is thinner still.
"Nothing can be done, so there is no point in knowing."
Knowing changes real things. It shapes which scans are used, how any cancer is treated and which relatives are tested. It also lets a family plan future pregnancies with the facts.
"An X-ray will give my child cancer."
An X-ray that is truly needed should still be done. The advice is to avoid scans that are not needed and to use ultrasound or MRI where they answer the question just as well.
Being straight with you
What this page cannot tell you
It cannot tell you what your own result means. These are rare conditions, and faults in the same gene can behave differently. What your specific variant means is a question for the counsellor who ordered the test.
It cannot give you a schedule
Watching plans for these syndromes are built from small studies and expert experience. They differ from child to child. Your care team will write one for you and review it as you grow older.
Who this does not apply to
If your result shows a variant of uncertain significance, this page does not apply to you. The same is true if the fault was found only in a tumour. Most people reading about these genes will never need a watching plan. Counselling can take place in Telugu, and a letter can be written for relatives in other districts.
If you are holding a report and do not know which situation you are in, call the helpline. Someone will help you reach a genetics team.Questions we are asked
Common questions after a positive result
I am a BLM carrier. Is my cancer risk higher?
Studies have given mixed answers, and any effect seems small. Most carriers are advised to follow screening based on their age and family history. If your family also has breast or bowel cancer, your counsellor may suggest checks based on that history.
Should my partner be tested?
If you are planning children, yes, it is worth discussing. A child can only have the syndrome if both parents carry a fault in the same gene. It matters most if you and your partner are related by blood.
Can my child with Bloom syndrome have chemotherapy?
Yes, if it is needed. People with Bloom syndrome can be more sensitive to some cancer medicines and to radiation. The cancer team plans treatment with this in mind and may use lower doses or different medicines.
Is there a treatment that fixes the gene?
No. A gene fault cannot be corrected or reversed. Care focuses on watching for problems early, treating them promptly and managing other parts of the syndrome, such as diabetes, cataracts or skin changes.
Why do doctors avoid X-rays and CT scans?
Cells in some of these syndromes repair radiation damage less well. Ultrasound and MRI give no radiation, so they are preferred for routine checks. An X-ray or CT scan is still used when it is truly needed.
My result says variant of uncertain significance. Is that positive?
No. It means the laboratory found a change and does not yet know whether it matters. It should not change your care or lead to testing of relatives. Ask how you will be told if it is ever reclassified.
Will this affect insurance?
India has no dedicated law on genetic discrimination in insurance. It is a fair question to raise with your counsellor, ideally before relatives are tested. Keep a copy of every report in a safe place.
Can we have another child without the syndrome?
Yes. Options include testing during pregnancy and testing embryos during IVF, and some couples choose neither. A counsellor can explain each one, what it involves and what it costs, before you decide.
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) — Bloom Syndrome
- GeneReviews (NCBI) — Werner Syndrome
- GeneReviews (NCBI) — Rothmund-Thomson Syndrome
- MedlinePlus Genetics — Bloom syndrome
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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