Yes, prostate cancer can be hereditary, but most cases are not

About 5 to 10 percent of prostate cancers are hereditary—meaning they result from an inherited gene mutation passed down through your family. The remaining 90 to 95 percent occur in men with no family history. If you have a father, brother, or son with prostate cancer, your risk is higher than average, but it is not certain. The strength of that risk depends on how many relatives were affected, how young they were at diagnosis, and which genes run in your family.

Hereditary prostate cancer typically appears earlier than sporadic cases—often before age 65—and may be more aggressive. Men with a family history should know their risk level and discuss screening options with their doctor, but having relatives with prostate cancer does not mean you will develop it.

Key Takeaways

  • Hereditary prostate cancer accounts for 5 to 10 percent of all cases and usually appears before age 65.
  • Your risk is elevated if your father, brother, or son has had prostate cancer, and even higher if multiple relatives were affected or diagnosed young.
  • Specific gene mutations—including BRCA1, BRCA2, and Lynch syndrome genes—increase prostate cancer risk, though most men with these mutations never develop the disease.
  • Genetic testing can identify whether you carry a high-risk mutation, but it does not predict whether you will get cancer.
  • Men with a family history should discuss screening and risk reduction with their doctor, starting earlier than men without family history.

How family history affects your risk

Having one relative with prostate cancer raises your risk compared to men with no family history, but the increase is modest. If your father or brother was diagnosed, your risk roughly doubles. If two or more relatives were affected—especially if they were diagnosed before age 55—your risk climbs further.

The timing of diagnosis matters. A father diagnosed at 40 signals a stronger hereditary pattern than one diagnosed at 75. Similarly, if multiple men in your family were affected across generations, that pattern suggests a shared genetic cause rather than coincidence.

Race also intersects with family history. Black men have higher prostate cancer incidence and mortality overall, and family history compounds that baseline risk. Men of Ashkenazi Jewish descent also carry elevated baseline risk, particularly if they carry BRCA mutations.

Genes linked to hereditary prostate cancer

Several genes have been identified in families with hereditary prostate cancer. The BRCA1 and BRCA2 genes, known for breast and ovarian cancer risk, also increase prostate cancer risk in men who carry mutations. Men with BRCA2 mutations face roughly a 20 to 25 percent lifetime risk of prostate cancer, higher than the general population risk of about 13 percent.

Lynch syndrome genes (MLH1, MSH2, MSH6, PMS2) increase risk for several cancers including prostate cancer. Men with Lynch syndrome mutations have roughly double the prostate cancer risk of the general population.

Other genes associated with hereditary prostate cancer include HOXB13, PTEN, and TP53, though these are rarer. Most men with these mutations will not develop prostate cancer, and most men with prostate cancer do not carry these mutations. Genetic testing identifies risk, not destiny.

When genetic testing makes sense

Genetic testing is not routine for all men. It is most useful if you have a strong family history—multiple relatives affected, or relatives diagnosed young—or if you carry ancestry linked to higher mutation rates. Testing can also be relevant if you have already been diagnosed with prostate cancer and want to know whether your cancer reflects a hereditary pattern that might affect your relatives.

A genetic counselor or oncologist can assess whether testing is appropriate for your situation. The test itself is simple: a blood or saliva sample sent to a laboratory. Results take one to three weeks.

If testing shows you carry a mutation, that information can guide your screening decisions and may influence your relatives' health choices. If testing is negative, it does not eliminate your risk—it simply means you do not carry the specific mutations the test looked for.

Screening and prevention for men with family history

Men with a family history of prostate cancer should discuss screening with their doctor earlier and more frequently than men without family history. The American Cancer Society recommends that men at higher risk begin conversations about screening at age 40 to 45, rather than the age 50 starting point for average-risk men.

Screening typically involves a prostate-specific antigen (PSA) blood test and sometimes a digital rectal exam. Neither test is perfect—both can produce false positives and false negatives—but they can detect cancer early when treatment is often more effective.

Prevention strategies for men at higher risk include maintaining a healthy weight, exercising regularly, and eating a diet rich in vegetables. Some research suggests that 5-alpha reductase inhibitors (finasteride or dutasteride) may lower prostate cancer risk in men at higher risk, though these medications have side effects and are not standard prevention. Your doctor can discuss whether these options fit your situation.

What to tell your relatives

If you are diagnosed with prostate cancer or learn you carry a high-risk gene mutation, your relatives should know. First-degree relatives—your father, brothers, and sons—have the most direct genetic connection and the highest risk. They should discuss screening and genetic testing with their own doctors.

Sharing this information can feel uncomfortable, but it gives relatives the chance to make informed decisions about their own health. You do not need to pressure them or provide medical advice; simply letting them know there is a family pattern allows them to bring that information to their doctor.

The limits of what genes tell us

Carrying a high-risk gene mutation does not may provide you will develop prostate cancer. Many men with BRCA2 mutations, for example, never develop the disease. Conversely, most men with prostate cancer have no identifiable hereditary mutation. This means genes are part of the picture, but environment, age, and chance also play roles.

Genetic testing reveals probability, not certainty. A positive result means your risk is higher than average, which should prompt closer monitoring and conversation with your doctor. It does not mean cancer is inevitable or that you need aggressive treatment you would not otherwise choose.

Frequently Asked Questions

If my father had prostate cancer, will I definitely get it?

No. Having a father with prostate cancer roughly doubles your risk compared to men with no family history, but most men with this family history never develop prostate cancer. Your actual risk depends on your father's age at diagnosis, whether other relatives were affected, and your own age and genetics.

Should I get genetic testing if prostate cancer runs in my family?

Genetic testing is most useful if multiple relatives were affected, relatives were diagnosed young (before 55), or you have already been diagnosed with prostate cancer. A genetic counselor or oncologist can assess whether testing makes sense for your situation. Testing identifies whether you carry specific high-risk mutations, but a negative result does not eliminate your risk.

What is the difference between hereditary and familial prostate cancer?

Hereditary prostate cancer results from a specific gene mutation that runs through families and can be identified by genetic testing. Familial prostate cancer means multiple relatives were affected but no single identifiable mutation is found. Both patterns suggest higher risk, but only hereditary cases can be confirmed by testing.

At what age should I start screening if prostate cancer runs in my family?

Men with a family history should discuss screening with their doctor at age 40 to 45, earlier than the age 50 recommendation for average-risk men. Your doctor can help you weigh the benefits and limitations of PSA testing and decide on a screening schedule that fits your risk level.

Can I reduce my prostate cancer risk if I carry a high-risk gene?

While you cannot change your genes, you can reduce other risk factors. Maintaining a healthy weight, exercising regularly, and eating a diet rich in vegetables and low in processed foods may help. Some men at higher risk take 5-alpha reductase inhibitors to lower risk, though these medications have side effects. Discuss prevention options with your doctor.