Medical Oncologist
CION Cancer Clinics
BLM, WRN and RECQL4: which cancers, and how much risk | CION Cancer Clinics
Two faulty copies of BLM, WRN or RECQL4 cause a rare syndrome with a greatly raised cancer risk, each with its own pattern. One faulty copy makes a person a healthy carrier, and any extra risk for carriers is small or unproven. This page sets out which cancers go with which gene, when each risk tends to appear, and what a carrier result means. At CION Cancer Clinics, our oncologists explain what a gene result means for you and your family, and plan the checks that follow.
NG
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
17+specialists on panel
15,000+patients treated
35+centres across Telangana & AP
4.8★ / 800+Google rating
On this page
- Which cancers are linked to BLM, WRN and RECQL4?
- What does the cancer risk look like in each syndrome?
- At what stage of life does each risk tend to appear?
- The terms on these reports, in plain language
- Two faulty copies or one: how does the risk differ?
- What this page cannot tell you
- Four things families tell us, and what is actually true
- Common questions about BLM, WRN and RECQL4 cancer risk
The short answer
Which cancers are linked to BLM, WRN and RECQL4?
The answer depends on whether a person has two faulty copies or one. Two faulty copies cause a rare syndrome with a greatly raised cancer risk: Bloom syndrome with BLM, Werner syndrome with WRN and Rothmund-Thomson syndrome with RECQL4. One faulty copy makes a person a carrier, and for carriers any raised risk is small or unproven.
Three genes, three different patterns
All three genes make proteins called helicases, which untangle DNA so it can be copied and repaired. When a helicase is missing, damage builds up faster than usual. Each gene works in a slightly different part of that job, which is why each syndrome has its own pattern of cancers and its own typical age.
Why the risks are hard to put into numbers
These syndromes are rare. The risk figures come from small groups of families, many of them outside India, and they vary between studies. For that reason this page describes the pattern in words and leaves personal figures to a specialist who knows the whole family.
These are recessive conditions. Both parents are usually healthy carriers.Condition by condition
What does the cancer risk look like in each syndrome?
Each card describes people with two faulty copies, except the last, which is about carriers.
Bloom syndrome (BLM)
The broadest risk of the three. Many cancer types can appear, often decades earlier than usual, and some people develop more than one.
Cancers most often seen
- Leukaemia and lymphoma
- Bowel, breast and skin cancers
- Mouth and throat cancers
- A kidney tumour in young children
Werner syndrome (WRN)
A condition of early ageing that usually shows in the teens or twenties. Cancers tend to appear in adult life and are often of unusual types.
Cancers most often seen
- Soft tissue and bone sarcomas
- Melanoma, often on the feet or hands
- Thyroid cancer and meningioma
Rothmund-Thomson syndrome (RECQL4)
The main concern is osteosarcoma, a bone cancer, in childhood or the teenage years. Skin cancers become more likely in adult life. Another gene, ANAPC1, causes a form of the syndrome without the same bone cancer risk, so knowing which gene is involved matters.
Carriers of one faulty copy
Carriers are healthy. Some studies suggested a small raised risk of certain cancers in BLM carriers and others did not. For WRN and RECQL4 carriers, no clear raised risk has been shown. For most carriers, the result matters mainly when planning a family.
Not sure whether this applies to you?
Ask an oncologistAcross a lifetime
At what stage of life does each risk tend to appear?
-
Early childhood
In Bloom syndrome, a kidney tumour called Wilms tumour can appear, which is why regular abdominal ultrasound is often advised in the early years.
-
Later childhood and the teens
Leukaemia and lymphoma are a concern in Bloom syndrome. In Rothmund-Thomson syndrome linked to RECQL4, this is the main window for osteosarcoma.
-
Young adult life
People with Bloom syndrome begin to face cancers usually seen in older adults, such as bowel and breast cancer. Werner syndrome often becomes recognisable around now.
-
Middle adult life
Cancers linked to Werner syndrome, including sarcomas, melanoma and thyroid cancer, are most often diagnosed in this period. Skin cancers become more likely in Rothmund-Thomson syndrome.
-
Throughout
Because the cells repair damage poorly, extra care is taken with radiation and with chemotherapy doses in all three conditions.
Words you will hear
The terms on these reports, in plain language
- Helicase
- A protein that unwinds DNA so it can be copied or repaired. BLM, WRN and RECQL4 all make one.
- Recessive
- A condition that appears only when both copies of a gene are faulty.
- Biallelic
- Both copies of a gene are faulty. This is what causes each syndrome.
- Heterozygous carrier
- One faulty copy and one working copy. Carriers do not have the syndrome.
- Osteosarcoma
- A cancer that starts in bone, most often near the knee or shoulder in young people.
- Sarcoma
- A cancer of muscle, fat, bone or other connective tissue.
Leave a number, we will call you
One field. No form to fill in, and no charge for the call.
Side by side
Two faulty copies or one: how does the risk differ?
Two faulty copies
One faulty copy
A named syndrome with visible signs
No signs, usually healthy
Greatly raised cancer risk, often young
Small or unproven raised risk
Specialist surveillance planned early
Screening guided by family history
Care with radiation and chemotherapy
Standard treatment if cancer occurs
Being straight with you
What this page cannot tell you
It cannot give you or your child a personal risk figure. The studies behind these syndromes are small, and the same gene can behave differently in different families. What your specific variant means is a question for the counsellor who ordered the test.
It cannot tell you whether a carrier result matters
Many adults now find a single BLM, WRN or RECQL4 fault on a broad test panel. For most, it matters mainly for their children's partners, not for their own cancer risk. Whether anything extra applies depends on the family history, which a counsellor can review.
Who this does not apply to
Most people do not need to think about these genes. The syndromes are rare and usually recognised in childhood or early adult life by their signs. Tumour testing to guide treatment is a different test, covered under targeted therapy.
Commonly believed
Four things families tell us, and what is actually true
"A carrier result means I have the syndrome."
It does not. A carrier has one working copy, which is enough. The syndromes need two faulty copies, one inherited from each parent.
"These three genes carry the same risk."
They are related but different. Bloom syndrome carries the broadest risk, Werner syndrome mostly affects adults, and RECQL4 is chiefly linked to bone cancer in the young.
"Cousin marriage caused this cancer."
Marriage within the family raises the chance that a child inherits two copies of a rare fault. It does not cause cancer directly, and most children of such marriages are healthy.
"More scans will keep us safe."
In these syndromes, X-rays and CT scans add radiation the cells repair poorly. Ultrasound and MRI are preferred wherever they can answer the question.
Questions we are asked
Common questions about BLM, WRN and RECQL4 cancer risk
Which of the three syndromes has the highest cancer risk?
Bloom syndrome carries the broadest risk, with many cancer types possible from childhood onward. Werner syndrome mainly raises risk in adult life. Rothmund-Thomson syndrome linked to RECQL4 is chiefly linked to osteosarcoma in the young. A specialist explains what applies to each person.
I am a BLM carrier. Do I need extra screening?
Usually not because of the gene alone. Some studies suggested a small raised bowel cancer risk in BLM carriers and others did not. Most carriers are screened according to their family history. Your counsellor can say whether anything extra is sensible for you.
Can Werner syndrome be missed until adulthood?
Yes. Children with Werner syndrome usually look well. The signs, such as no teenage growth spurt, early greying, cataracts and skin changes, tend to appear in the teens and twenties. It is often recognised only in adult life.
What signs of cancer should families watch for?
Bone pain or swelling that does not settle, a limp, unexplained tiredness, frequent bruising, a lump, or a mole that changes. None of these means cancer on its own. In these syndromes they should be checked promptly rather than waited out.
Is cancer treatment different for people with these syndromes?
It often needs adjusting. The cells repair damage poorly, so chemotherapy and radiotherapy can cause stronger side effects. The oncology team may change doses or choose other approaches. Tell every new doctor about the syndrome before treatment is planned.
Both of us are carriers. What does that mean for our children?
If both parents carry a fault in the same gene, each pregnancy has a one-in-four chance of a child with the syndrome. Carriers of faults in two different genes cannot have an affected child from that pairing. A counsellor can explain the options.
Why is marriage within the family asked about?
Relatives are more likely to carry the same rare fault. In Telangana, marriage between cousins or an uncle and a niece is still common in some communities. Mentioning it helps the counsellor read the family tree correctly. It is asked without judgement.
Where can these conditions be assessed in Hyderabad?
Diagnosis usually needs a clinical geneticist and a laboratory that can test these genes. CION can help families reach a genetics team and coordinate oncology care if a cancer is found. Call the helpline and describe the signs and the family history.
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
Want a specific doctor for your case? Mention them when booking.
Book Free ConsultationBook an appointment with our specialist
Share your name and number — we'll call you back within 30 minutes to schedule your consultation.
Sources
- GeneReviews (NCBI) — Bloom Syndrome
- GeneReviews (NCBI) — Werner Syndrome
- GeneReviews (NCBI) — Rothmund-Thomson Syndrome
- MedlinePlus Genetics — Werner 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.
Keep reading
Related pages
Talk to us
Found BLM, WRN or RECQL4 on a report?
A genetic counsellor can explain whether your result is a carrier finding or something more, and what it means for your family. One helpline serves every CION centre.