Prostate cancer is the most common cancer in men, with approximately 50,000 new cases diagnosed each year in France. When a father, brother, uncle, or other close relative has been affected, the same question often arises: is there a prostate cancer gene?
The answer is nuanced. Yes, there are identified genetic predispositions . No, simply having a case of prostate cancer in the family does not automatically mean that one is personally at significant hereditary risk.
The challenge, therefore, is to clearly distinguish between ordinary situations and those that should raise the possibility of a family history and justify a specialist evaluation.
Can prostate cancer be genetic?
Yes, in some cases. Among the risk factors for prostate cancer, there is indeed a hereditary risk factor .
To date, two genes have been specifically identified in this predisposition:
- BRCA2
- HOXB13
These names may seem technical, but they are important because their presence is associated with prostate cancer:
- more frequent ,
- earlier ,
- more aggressive .
In other words, when a true genetic predisposition exists, it not only changes the probability of developing cancer, but can also influence the age at which it appears and its behavior.
Having a close relative affected does not necessarily mean you are at genetic risk.
This is a crucial point. Many men become concerned as soon as a family member has had prostate cancer. This concern is understandable, but it's important to avoid jumping to conclusions.
An isolated case in the family is not, by itself, sufficient to conclude that there is a genetic predisposition.
To suspect a hereditary predisposition, specific family criteria are relied upon. These criteria then guide the patient towards an oncogenetic consultation .
What family history should suggest a genetic predisposition?
The most telling situations are the following:
- 3 cases of prostate cancer in the family,
- or 2 cases of prostate cancer before the age of 55 .
These cases must concern relatives described as:
- of the 1st degree : father, brother, son,
- or of the 2nd degree : for example uncle, nephew.
The idea is therefore not just to count the cases, but also to look at the age at diagnosis and the degree of kinship .
We also need to look at the maternal side
When people talk about prostate cancer, many spontaneously think of the paternal lineage. This is a common mistake.
Maternal heredity also plays a role. Certain family histories on the mother's side can point towards a genetic predisposition associated with prostate risk.
Particular attention should be paid to:
- Breast cancer in men , which is rare enough to be considered a warning sign,
- breast cancer before the age of 40
- bilateral breast cancer , regardless of age,
- ovarian cancer .
These antecedents, on both the maternal and paternal sides, may be part of a family context compatible with a genetic anomaly, particularly around the BRCA2 gene.
What should you do if you think you have a hereditary risk?
The first step is not to request a random test. The correct approach is to consult an oncogeneticist .
His role is essential. He is the one who will:
- analyze your family history ,
- to determine if genetic testing is warranted,
- specify how this research should be carried out.
- organize the appropriate care.
In other words, we don't systematically look for a genetic mutation in everyone. We look for it in targeted situations, when personal and family history truly justifies it.
What happens if a risk gene is identified?
When a risk gene is confirmed, it does not mean that cancer is already present. However, it leads to the implementation of specific, earlier, and more structured screening .
The terms mentioned are as follows:
- screening should begin at a younger age, around 45 , or even 40 .
- regular follow-up every 2 to 4 years .
Screening remains based on traditional tools:
- the clinical examination ,
- PSA testing ,
- and, if there is any doubt, a prostate MRI .
The goal is simple: to detect potentially significant forms of the disease earlier , especially in families where the risk is higher and where cancers can be more aggressive.
Why this early screening is important
When a genetic risk is real, waiting the same time frame as for the general population is not always appropriate. Starting earlier allows for greater vigilance when the disease is likely to appear.
This point is particularly important because cancers associated with certain predisposing genes can be:
- diagnosed at a younger age ,
- and have a more aggressive profile.
Identifying a genetic predisposition is therefore not a fatal flaw. On the contrary, it is useful information that allows for tailored monitoring and increases the chances of early intervention.
Key points to remember
- There are indeed hereditary forms of prostate cancer.
- The two genes primarily identified are BRCA2 and HOXB13 .
- These genes are associated with more frequent, earlier and more aggressive cancers.
- A single isolated case in the family is not sufficient to conclude that there is a genetic predisposition.
- The suggestive situations are based on a number of cases , their age of occurrence and the degree of kinship .
- We must also consider the maternal side , particularly in cases of breast or ovarian cancer.
- If in doubt, the right course of action is an oncogenetic consultation .
- If a risk gene is found, earlier screening is put in place, with clinical examination, PSA and prostate MRI if necessary.
When should you consult a doctor?
It is advisable to speak with a specialist if you recognize yourself in one of these situations:
- several cases of prostate cancer in your family,
- cases diagnosed in young people , before the age of 55.
- a history of breast cancer in men ,
- early-onset, bilateral breast cancer, or ovarian cancer on the maternal or paternal side.
The goal is not to cause undue alarm, but to identify situations where genetic evaluation can truly change the screening strategy.
Conclusion
The question of the prostate cancer gene deserves a clear answer: yes, some forms are linked to a genetic predisposition, but not all family histories involve a major hereditary risk.
What matters is spotting the right signs: repetition of cases in the family, early onset, associated cancers such as breast or ovarian, including on the maternal side.
When these elements are present, an oncogenetic consultation allows for sorting, precise risk assessment and, if necessary, earlier and more appropriate prostate cancer screening to be organized.
When it comes to prostate cancer, understanding one's family history is already a smart way to prevent it.