Medical Oncologist
CION Cancer Clinics
RAD51C mutation: which cancers, and how much risk | CION Cancer Clinics
A RAD51C fault mainly raises the risk of ovarian cancer and, to a lesser degree, breast cancer. The rise is moderate: higher than in the general population, lower than with BRCA1 or BRCA2. Ovarian risk also tends to appear later in life. This page sets out which cancers are linked, how strong the evidence is, when the risk rises and what it means for men. 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 does a RAD51C fault make more likely?
- How strong is the evidence for each cancer?
- When in life does the risk actually rise?
- The words used to describe RAD51C risk, in plain language
- How does RAD51C compare with BRCA1?
- What this page cannot tell you
- Four things families tell us about RAD51C, and what is true
- Common questions about RAD51C cancer risk
The short answer
Which cancers does a RAD51C fault make more likely?
A RAD51C fault mainly raises the risk of ovarian cancer, including cancer that starts in the fallopian tube. It also raises the risk of breast cancer, especially a type called triple-negative. The rise is real but moderate: clearly higher than in the general population, and lower than with a BRCA1 or BRCA2 fault.
Ovarian risk is the main concern
Ovarian cancer is uncommon in the general population, and a RAD51C fault multiplies that risk several times over. That matters because the ovaries cannot be screened well. There is no scan or blood test that reliably finds ovarian cancer early, so the plan for this risk is a conversation about surgery rather than a schedule of checks.
Breast risk, and why the type matters
Breast cancer risk is raised to a moderate degree. The cancers that do appear are more often triple-negative, meaning they do not grow in response to hormones or the HER2 protein. That shapes how a doctor thinks about breast checks and about treatment if a cancer is found.
Risk is a statement about a large group of carriers. It is not a prediction about you.Organ by organ
How strong is the evidence for each cancer?
The evidence is solid for two organs and thin for the rest. It helps to know which is which.
Ovary and fallopian tube
The strongest and best-studied link. Large studies of families agree that the risk is raised well above the general population, and that it tends to appear later in life than with BRCA1.
Breast
A moderate rise, now accepted by major guidelines. The link is strongest for triple-negative breast cancer. A strong family history of breast cancer can push an individual's risk higher than the average for carriers.
Other cancers
Links to prostate, pancreatic and other cancers have been looked for. So far the studies are small and the results are not consistent.
No extra checks are recommended for these organs on the strength of RAD51C alone.Men who carry it
A man with a RAD51C fault has no clearly proven raised cancer risk of his own. His result still matters a great deal.
Why he should still know
- Each daughter has a one in two chance of inheriting it
- His sisters may carry it too
- Evidence for men may change as studies grow
Not sure whether this applies to you?
Ask an oncologistAcross a lifetime
When in life does the risk actually rise?
-
Childhood and teenage years
No raised cancer risk is known in childhood. This is one reason testing children for RAD51C usually waits until they are adults and can decide for themselves.
-
Twenties and thirties
Ovarian risk stays low. Breast risk is slightly raised, and a woman with a strong family history of young breast cancer may be advised to start breast checks earlier than usual.
-
The forties
Breast checks are usually under way. Ovarian risk begins to climb towards the end of this decade, which is why preventive removal of the ovaries and tubes is often discussed around this time.
-
After the menopause
Most ovarian cancers linked to RAD51C are diagnosed in the fifties and later. This later timing gives women more room to decide than BRCA1 carriers have.
-
Later life
Breast checks continue, reviewed as breast tissue changes with age. Any new symptom still needs reporting, whatever the date of the last check.
Reading about risk
The words used to describe RAD51C risk, in plain language
- Moderate-risk gene
- A gene whose faults raise cancer risk clearly, but less than the highest-risk genes such as BRCA1. RAD51C is usually placed here.
- Penetrance
- How often a fault actually leads to cancer across everyone who carries it. For RAD51C, most carriers never develop cancer.
- Lifetime risk
- The chance of developing a cancer by old age. It is the number most useful for making decisions.
- Relative risk
- How many times higher the risk is than in people without the fault. A large relative risk of a rare cancer can still be a small lifetime risk.
- Triple-negative breast cancer
- A breast cancer that does not respond to hormones or to HER2. It is treated differently from other breast cancers.
- Germline
- Present in every cell from birth, and therefore inheritable. That is the kind of RAD51C fault this page is about.
Leave a number, we will call you
One field. No form to fill in, and no charge for the call.
Side by side
How does RAD51C compare with BRCA1?
RAD51C fault
BRCA1 fault
Ovarian risk raised, to a moderate level
Ovarian risk raised, to a high level
Ovarian cancers mostly after the menopause
Ovarian cancers often earlier
Breast risk moderately raised
Breast risk highly raised, often young
No proven raised risk in men
Raised breast and prostate risk in men
Being straight with you
What this page cannot tell you
It cannot give you your own number. Published risk figures for RAD51C come from studies of different families, and they vary. Your own risk also depends on how many relatives have had ovarian or breast cancer and at what age. A genetic counsellor can put those pieces together. What your specific variant means is a question for the counsellor who ordered the test.
It cannot interpret a tumour result
A RAD51C change found only in a tumour is a different result from an inherited fault. It is used to guide treatment and belongs with targeted therapy. Only a blood test shows whether the fault was inherited.
Who this does not apply to
If your report lists a RAD51C variant of uncertain significance, the risks on this page do not apply to you. That result should not change your checks or lead to surgery. Most people with one relative who had breast cancer late in life do not need a RAD51C test at all.
Commonly believed
Four things families tell us about RAD51C, and what is true
"RAD51C is just as serious as BRCA."
The ovarian risk is real, but lower and later than with BRCA1 or BRCA2. That usually means more time to decide, and less pressure to act young.
"Nobody had ovarian cancer in our family, so my risk must be low."
A small family, or a fault passed down through men, can hide the pattern completely. The result itself is what matters, whatever the family history looks like.
"Only the women in the family need to know."
A father can pass the fault to his daughters just as a mother can. Brothers and fathers should be offered testing so their daughters are not missed.
"The percentage I read online is my risk."
Online figures are averages from one study or another. Your counsellor adjusts them for your age, your family and any surgery you have already had.
Questions we are asked
Common questions about RAD51C cancer risk
Will I definitely get cancer if I carry RAD51C?
No. Most people who carry a RAD51C fault never develop ovarian or breast cancer. The fault raises the chance above that of the general population. Regular breast checks and a timely decision about the ovaries lower the chance that a cancer is found late.
Can ovarian cancer be found early with scans?
Not reliably. Ultrasound and the CA-125 blood test have been studied as screening tools, and neither finds ovarian cancer early enough to be trusted. This is why removing the ovaries and tubes is discussed for RAD51C carriers once they are older.
Does RAD51C cause cancer in the womb?
There is no good evidence that it does. The raised risk is in the ovaries and fallopian tubes. Bleeding after the menopause should always be checked, but not because of RAD51C.
I already have breast cancer. Does RAD51C change my treatment?
It can. RAD51C works in the same repair system as BRCA1 and BRCA2, and cancers with a fault in that system may respond to some targeted medicines. Whether that applies to you depends on the cancer itself. Ask your oncologist directly.
Is RAD51C the same as RAD51D?
They are separate genes that do closely related jobs. Faults in both raise ovarian and breast cancer risk to a broadly similar degree, and guidelines handle them in much the same way. Your report will name one or the other, and it matters which.
Why was RAD51C not on my mother's old test?
Older tests often looked at BRCA1 and BRCA2 only. RAD51C was added to panels later, as the evidence grew. A family that tested negative years ago may be offered a wider panel now.
Does being a man with RAD51C mean I need checks?
At present, no extra checks are recommended for men on the basis of RAD51C alone. Follow the screening advice for your age. Make sure your daughters and sisters know, because the ovarian risk is theirs.
Who can explain my family's actual risk?
A genetic counsellor or clinical geneticist, working from your report and a full family tree. Bring the names, cancers and ages at diagnosis for both sides of the family. The CION helpline can arrange that appointment.
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
- MedlinePlus Genetics — RAD51C gene
- National Cancer Institute — Genetics of Breast and Gynecologic Cancers (PDQ)–Health Professional Version
- NCCN — Genetic/Familial High-Risk Assessment: Breast, Ovarian, Pancreatic, and Prostate
- Cancer Research UK — Inherited cancer genes and increased cancer risk
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
The RAD51C gene: what it doesWhy a DNA-repair fault raises risk at allRAD51C and ovarian risk: why surgery is discussedThe decision most carriers eventually faceSurveillance for RAD51C carriersWhich checks to have, and whenRAD51D mutation: which cancers and what riskThe closely related gene, compared
Talk to us
Want your family's risk explained properly?
Bring your RAD51C report and your family history to a genetic counsellor who can put the two together. We can arrange that appointment and help you plan what comes next. One helpline serves every CION centre.