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RAD51D in the family: who should be tested, and how | CION Cancer Clinics
When one person carries a RAD51D fault, each parent, brother, sister and adult child has a one in two chance of carrying it too. They need a simple test for the exact variant already found, not a full panel. This page explains who to offer testing to first, how it works and what a positive or negative result changes. 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
- Who in the family should be tested for RAD51D?
- Which relatives come first, and which can wait?
- How does family testing for RAD51D actually work?
- What do the family testing terms mean?
- What does a relative's result change?
- Four things families say about testing relatives, and what is true
- What this page cannot tell you
- Common questions about testing the family for RAD51D
The short answer
Who in the family should be tested for RAD51D?
Start with your closest adult relatives: parents, brothers, sisters and grown-up children. Each of them has a one in two chance of carrying the same fault. They need a simple test for the exact variant on your report, not a full panel of genes.
Why it is worth doing
A relative who carries the fault can plan breast checks and a timely conversation about ovarian surgery. A relative who does not carry it can usually stop worrying about this gene and follow ordinary screening. Both answers are useful, and the second is just as common as the first.
Men matter as much as women
A brother or father who carries RAD51D has no clearly raised risk of his own. His daughters, though, each have a one in two chance of inheriting it from him. Leaving the men out is one of the most common ways a fault goes unnoticed for another generation.
It spreads outward, one step at a time
Once you know which parent the fault came from, testing can move to that parent's brothers, sisters and their children. This step-by-step approach is called cascade testing.
Testing is always a choice. A relative can decide not to know, and that decision deserves respect.Who to offer it to
Which relatives come first, and which can wait?
Order matters. Testing the right person first saves time, money and worry for everyone else.
Brothers and sisters
Each full sibling has a one in two chance. Sisters gain the most from knowing, because the result shapes their breast and ovarian plan. Brothers matter for their own children.
Parents
Testing a parent shows which side of the family the fault came from. That tells you which aunts, uncles and cousins to offer testing next.
If a parent has died
- A stored tissue block may still be tested
- Testing the parent's siblings can also answer the question
Adult children
Each child has a one in two chance. Because RAD51D risk appears in adult life, testing usually waits until the child is an adult who can decide.
The wider family
Aunts, uncles and cousins on the side the fault came from come next. Their chance of carrying it is lower, but a positive result for them matters just as much.
Not sure whether this applies to you?
Ask an oncologistStep by step
How does family testing for RAD51D actually work?
You share the result
Your counsellor gives you a family letter that names the gene and the exact variant. It can be written in Telugu and forwarded on WhatsApp or by post.
The relative sees a counsellor
They talk through what a positive or negative result would mean for them before giving a sample. They can stop at this point if they choose.
A targeted test is done
The laboratory checks only for the variant already found in the family. This single-site test is simpler, quicker and cheaper than a full panel.
The result is explained
A counsellor gives the result in person or by video, and sets out a plan if it is positive. A negative result is explained just as carefully.
The next circle is offered testing
A relative who tests positive now shares the letter with their own brothers, sisters and adult children. A relative who tests negative closes the question for their branch of the family.
Family testing words
What do the family testing terms mean?
- Cascade testing
- Testing relatives step by step, starting with the closest, once a fault is known in the family.
- First-degree relative
- A parent, brother, sister or child. They share half your genes, which is why each has a one in two chance of carrying the fault.
- Known familial variant
- The exact change found in the first person tested. Relatives are tested for this change only, so keep the report where family can find it.
- Single-site test
- A test that looks at one known spot in the gene. It is the right test for relatives in most cases.
- Obligate carrier
- Someone who must carry the fault because it sits both above and below them in the family tree, even without a test.
- True negative
- A relative who tests negative for the family's known variant. Their risk from RAD51D returns to the general level.
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Side by side
What does a relative's result change?
Relative tests positive
Relative tests negative
Breast checks planned, usually from around forty
Ordinary screening for age applies
Ovary surgery discussed later in adult life
No surgery discussion needed for RAD51D
Their own children can be offered testing
Their children cannot inherit it from them
Family planning choices can be discussed
Other family history may still need review
Commonly believed
Four things families say about testing relatives, and what is true
"My sister looks healthy, so she does not need the test."
Carriers feel perfectly well. The test is for healthy relatives, so they can plan checks before anything happens.
"She tested negative, but she should keep worrying anyway."
A negative test for the known family variant is a real answer. Her risk from RAD51D is back to the general level. Other family history may still count, and her counsellor will say so.
"Telling relatives will spoil marriage prospects."
This fear is common and understandable. A counsellor can help you decide who to tell, when and how, and a carrier can still marry and have children. Keeping silent removes a relative's chance to plan.
"Everyone should have the full panel, to be safe."
Once the family variant is known, a targeted test gives a clearer answer for less. A full panel is only needed if the family history suggests a second cause.
Being straight with you
What this page cannot tell you
It cannot tell you how to tell your family, or who in your particular family should go first. Families differ in size, closeness and how they talk about illness. What your specific variant means is a question for the counsellor who ordered the test, and that counsellor can also help plan who to approach.
It cannot settle questions about marriage or insurance
India has no dedicated law protecting people from genetic discrimination. Decisions about disclosure before marriage, or before buying insurance, are personal. They are worth talking through with a counsellor before relatives are tested, not afterwards.
Who this does not apply to
If your report shows a variant of uncertain significance in RAD51D, relatives should not be tested for it. The result would not guide their care. Family testing is only offered for a pathogenic or likely pathogenic variant.
Relatives in another state or abroad can usually be tested locally using a copy of your report.Questions we are asked
Common questions about testing the family for RAD51D
Does my relative need a blood test or saliva?
Either usually works for an inherited test. The laboratory will say which sample it accepts. What matters most is that the request names the exact variant from your report, so the right spot in the gene is checked.
Should my children be tested now?
Usually not while they are young. RAD51D risk appears in adult life, and nothing changes for a child who carries it. Waiting lets them decide for themselves as adults, with a counsellor to support them.
My relative lives abroad. Can they still be tested?
Yes. Send them the family letter and a copy of your report. Any accredited genetics service can run a targeted test for the same variant. They do not need to travel to Hyderabad.
What if a relative does not want to know?
That is their right. You can share the letter once and leave the door open. Pressure rarely helps, and many people come back to the question later, often when their own children grow up.
My husband and I are related. Does that matter?
It may. In marriages within the family, both partners can carry the same fault. What two faulty RAD51D copies would mean for a child is not clearly established. Ask a counsellor about testing your partner before a pregnancy.
Is testing relatives expensive?
A targeted test for a known variant usually costs much less than the first panel test. Prices vary between laboratories. Ask the counsellor for a written estimate before the sample is taken.
Can a man pass on RAD51D without being affected?
Yes. A father has a one in two chance of passing the fault to each child. He may never develop cancer himself, which is why the fault can seem to appear from nowhere in a daughter.
Where do relatives in Telangana go for testing?
They can see a genetic counsellor in Hyderabad or by video, and give a sample locally in many cases. Call the CION helpline, and someone will help arrange counselling and the targeted test.
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
- National Cancer Institute — Genetic Testing for Inherited Cancer Susceptibility Syndromes
- NHS — Predictive genetic tests for cancer risk genes
- National Cancer Institute — Genetics of Breast and Gynecologic Cancers (PDQ) - Health Professional Version
- NCCN — Genetic/Familial High-Risk Assessment: Breast, Ovarian, Pancreatic, and Prostate
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
How cascade testing worksThe general method behind family testingFamily letter in TeluguA way to share the result that relatives can readRAD51D mutation: which cancers and what riskWhat a positive relative is actually facingSurveillance for RAD51D carriersThe checks a relative who tests positive will need
Talk to us
Need help telling your family about RAD51D?
A genetic counsellor can prepare a family letter, in Telugu if you prefer, and arrange targeted testing for relatives. One helpline serves every CION centre.