If one parent has a harmful BRCA variant, what is your chance of inheriting it?
A harmful BRCA1 or BRCA2 variant from one parent is not automatically inherited. Cancer Research UK gives each child a 1 in 2, or 50%, chance. The next useful step is to confirm the exact family variant and decide whether predictive genetic testing fits your situation.
The useful answer starts with the harmful variant, not the gene
Everyone has BRCA1 and BRCA2 genes. The concern is a harmful variant, also called a pathogenic variant, gene change or gene fault. That distinction matters because saying “my parent has the BRCA gene” can make inheritance sound automatic or abnormal in itself.
A harmful BRCA variant can be passed on by either parent. You can inherit BRCA from your mother or inherit BRCA from your father, and sons and daughters both need to take paternal inheritance seriously. A father who carries a BRCA variant can pass it to a daughter or a son in the same way a mother can.
An inherited cancer gene change is sometimes called a germline mutation. In plain terms, that means the change has been present from conception and is copied into the cells of the body. Carrying that change raises cancer risk, but it does not mean cancer is certain. Testing answers one question first: did you inherit the known family change?
Expert advice on breast cancer treatment, cosmetic breast surgery, and reconstruction options in London.
Book a ConsultationBRCA can look as though it skips a generation
BRCA does not truly skip a generation if the variant is inherited. Cancer can appear to skip because a parent may carry the variant and never develop cancer, while a child who inherits the same variant may develop cancer later.
What appears to happen is a gap in the family story: a grandparent has breast or ovarian cancer, a parent has no cancer diagnosis, then a child is told the family may carry a BRCA1 or BRCA2 variant. That pattern can lead people to dismiss the risk, especially on the father’s side.
What may actually be happening is simpler. The parent may be an unaffected carrier, or the family may have few female relatives, or cancer patterns may be less obvious in male relatives. Male BRCA carriers can still matter to family testing, and prostate cancer risk discussion may be relevant in some genetics appointments.
Guessing from the family tree alone is a poor substitute for identifying the family variant. Once the exact variant is known, testing becomes a much clearer question.
Bring the exact family report if you have it, because predictive testing is interpreted differently from a broad genetic panel when the known variant is already identified.
Testing is clearer when the family variant is known
The right BRCA test depends on the starting point: a confirmed family variant, or a strong family history with no known variant yet. That difference changes the pathway and the meaning of a negative result.
Predictive testing after a known family variant
Predictive genetic testing looks for the same inherited cancer gene change already found in a close relative. If your mother, father, sibling or another close relative has a confirmed BRCA1 or BRCA2 pathogenic variant, the testing question is focused: have you inherited that same change?
Genetic counselling is part of making the result useful. A counsellor or genetics specialist can explain what the test covers, what the possible results mean, and how a result could affect relatives. In London-based consultant breast risk assessment, we use genetics information alongside your personal history, breast imaging context and family pattern, because the test result is one part of the decision.
At D B Ghosh, we see the most useful consultations start with the actual family report where possible. A vague memory that “someone had BRCA” is less helpful than knowing whether the variant was in BRCA1 or BRCA2 and which relative was tested.
Family-history assessment when no family variant is known
A strong family history can still justify genetics review even when no one has yet had a confirmed BRCA result. Cancer patterns matter more when several close relatives on the same side of the family have related cancers, when cancer occurred young, or when breast, ovarian, prostate or pancreatic cancers appear in a linked pattern.
A GP referral or genetics clinic review may be the right route in the NHS if a strong family history is present or if an inherited gene change has been found in a relative. A genetics clinic appointment usually looks at your family history, estimates risk and decides whether testing is needed; the appointment may be in person or by phone.
NHS England also offers BRCA testing for people of Jewish ancestry who live in England, are aged 18 or over, and have at least one Jewish grandparent. NICE guideline CG164 covers familial breast cancer care for people with a family history of breast, ovarian or related prostate or pancreatic cancer, including genetic testing, mammography, risk reduction, medicines and surgery.
Private testing needs the same discipline. A test that gives you a result without clear counselling, test scope and interpretation can leave you with more uncertainty than you had before.
A BRCA result changes planning, not your whole plan by itself
A BRCA result should be interpreted through your age, sex, personal history, family history, variant type and priorities. A positive result can lead to high-risk breast care discussions, but it is not an automatic instruction to have surgery.
- A positive result may lead to planned surveillance. Breast MRI, mammography and clinic review may be discussed in a high-risk breast pathway, depending on your situation and specialist advice.
- A positive result may lead to surgery discussions. Risk-reducing breast surgery, reconstruction timing and symmetry planning are serious choices that need careful explanation, not rushed agreement.
- Ovarian risk may need a separate discussion. Risk-reducing bilateral salpingo-oophorectomy may be raised in specialist care where it is relevant to the variant and your life stage.
- A negative result still needs context. If the exact family variant is known and you have not inherited it, your children cannot inherit that variant from you. If the family variant is not known, a strong family history may still need specialist risk assessment.
- Children are handled differently. Testing under 18 is not usually routine for adult-onset cancer risk, because the person being tested generally needs to be old enough to make their own decision and understand the implications.
At D B Ghosh, we treat a BRCA result as a planning tool, not a label. For breast care, the decision is usually about sequencing: whether surveillance is enough for now, whether risk-reducing breast surgery belongs in the conversation, and how reconstruction would be planned if surgery became the right choice.
If the family history is mainly on the father’s side, make sure the consultation covers paternal inheritance clearly, since that is often overlooked when people first think about BRCA risk.
Your consultation should connect the test to breast-care decisions
A good BRCA risk consultation joins three things together: the family variant, the testing route and the breast-care implications. Bring whatever you have about the family result, the cancer types in relatives, ages at diagnosis and whether the cancers were on your mother’s or father’s side.
The difference between a rushed test-first approach and a planned assessment is practical, not academic.
| Rushed test-first approach | Planned genetics-led breast-risk approach |
|---|---|
| Starts with buying or ordering a broad test | Starts with the family history and any known BRCA1 or BRCA2 variant |
| Can produce a result that is hard to interpret | Links the result to your own risk and clinic decisions |
| May skip counselling about relatives and children | Covers what the result could mean for family members |
| Can push surgery into the conversation too early | Places breast MRI, mammography and risk-reducing surgery in the right order |
| Gives short-term certainty without a full plan | Builds a clearer long-term route for surveillance or surgery discussion |
Useful questions include whether the family variant has been confirmed in writing; whether your test would be predictive genetic testing or a broader panel; how a positive or negative result would change breast screening; whether risk-reducing breast surgery is relevant now or only a future discussion; and what the result could mean for children or siblings.
One approach chases a quick answer and then tries to make sense of it afterwards. The better long-term approach defines the question first, tests for the right reason, and uses the result to make breast-care decisions in sequence. That order gives you clarity without pushing you into choices before the risk has been properly framed.
Expert breast surgery advice from a leading London consultant with over 30 years of experience.
Book ConsultationFrequently asked questions
If my dad has a harmful BRCA variant, can he pass it to me?
Yes. A father can carry and pass on a harmful BRCA1 or BRCA2 variant to a son or daughter, so paternal family history matters.
Does a positive BRCA result mean I need a mastectomy?
No. A positive result may lead to a discussion about risk-reducing breast surgery, but surveillance, timing, reconstruction and personal priorities all need specialist review.
Can my children be tested for BRCA before they are 18?
Children under 18 are not usually tested for adult-onset cancer gene risk. Testing is generally left until the person can make their own informed decision, unless a specialist reason applies.
What if my BRCA test is negative but my family history is still strong?
A negative result is clearest when the exact family variant is known and you tested negative for that same change. If no family variant has been identified, your family history may still need genetics-led risk assessment.
Should men have BRCA testing after a family result?
Men may need testing if a harmful BRCA variant has been found in the family or if the family pattern raises concern. Male carriers can pass the variant on and may need their own risk discussion.
