Can Prostate Cancer Be Prevented? What Men Should Know

Prostate cancer cannot be prevented, but maintaining a healthy weight, staying physically active, and understanding personal risk factors may help reduce the risk of developing the disease. Screening does not prevent cancer, but an informed discussion about PSA testing can support earlier detection, especially for men with a strong family history or inherited genetic risk. Supplements such as selenium and vitamin E have not been shown to prevent prostate cancer and should not be used as a substitute for medical advice.

There are currently no proven preventive strategies for prostate cancer. Age inherited genetic changes, and family history cannot be altered, while evidence linking individual foods or supplements to a lower risk remains limited. However, maintaining a healthy weight, staying physically active, and looking after overall metabolic health may help reduce the risk of developing the disease.

Effective prostate cancer prevention also involves understanding personal risk and making informed decisions about prostate-specific antigen, or PSA, testing. Screening does not stop cancer from developing, but it may identify clinically significant disease before it causes symptoms. At the National Cancer Centre Singapore (NCCS), we encourage men to discuss their individual risk factors and the possible benefits and limitations of testing with a doctor.

Key Takeaways

• There is no lifestyle practice, medicine, or supplements that can guarantee prostate cancer prevention because important risk factors, including age and inherited susceptibility, cannot be changed.
• Maintaining healthy body weight may help to reduce the risk of developing prostate cancer.
• A balanced eating pattern supports general health, but no single food, has been proven to prevent prostate cancer.
• PSA screening in Singapore is an individual decision because while it can help detect cancer early but can also lead to false alarms, overdiagnosis, and investigations for cancers that may never cause harm.
• Men with a strong family history or certain inherited genetic changes may need an earlier and more personalised discussion about prostate cancer risk and screening.

Can Prostate Cancer Be Completely Prevented?

There is currently no way to prevent prostate cancer. Some prostate cancer tumours remain small and slow growing for years, while others can be biologically aggressive and more likely to spread.

Research into prevention must therefore answer more than whether an intervention reduces the total number of diagnoses. It must also determine whether the intervention reduces clinically significant cancers, advanced disease, or deaths from prostate cancer without creating unacceptable harm.

For men considering their risk, it is helpful to separate three related concepts:

• Primary prevention aims to reduce the chance of prostate cancer developing.
• Early detection aims to find an existing cancer before it progresses or causes symptoms.
• Risk reduction after diagnosis aims to support general health and potentially reduce complications or progression as part of clinical care.

These goals overlap, but they are not interchangeable. A PSA test is an early detection tool, not a method of preventing cancer from forming.

Which Prostate Cancer Risk Factors Cannot Be Changed?

A man’s underlying risk is influenced by factors that are outside his control. Recognising these factors does not predict that cancer will occur, but it can indicate when a more personalised medical discussion is appropriate.

Increasing age

Age is one of the strongest established risk factors. Prostate cells accumulate genetic and epigenetic changes over time, and the biological systems responsible for repairing cellular damage can become less efficient.

An age-related rise in risk does not mean that every older man should automatically undergo testing. Decisions about screening also need to consider general health, life expectancy, individual preferences, and whether discovering a slow-growing cancer would provide a meaningful benefit.

Family history

Risk can be higher when a close blood relative, particularly a father or brother, has had prostate cancer. The family pattern is more significant when:

• More than one close relative has been affected
• A relative was diagnosed before the age of 65
• Prostate cancer occurred across several generations
• A relative had aggressive or metastatic prostate cancer
• Breast, ovarian, pancreatic or male breast cancers also occur in the family

Inherited genetic susceptibility

Some prostate cancers are associated with inherited pathogenic variants. These include variants affecting BRCA2, and less commonly BRCA1, as well as genes involved in DNA mismatch repair and other hereditary cancer pathways.

BRCA2 is particularly relevant because an inherited pathogenic variant can be associated with a greater likelihood of developing prostate cancer and with more aggressive disease. However, the presence of a variant does not mean that cancer is inevitable.

Genetic testing is not required for every man. A doctor or genetic counsellor may consider it when the personal or family history suggests an inherited cancer syndrome. Genetic counselling can help explain:

• Whether testing is clinically appropriate
• Which family member should ideally be tested first
• What a positive, negative or uncertain result means
• How the result could affect screening
• Whether relatives may also benefit from assessment

The NCCS Cancer Genetics Service provides genetic counselling to individuals with a personal and/or family history of cancer. If you have a personal or family history suspicious for a hereditary cause, call 6436 8088 for an appointment with CGS.

Consumer genetic tests may not examine all medically important variants and should not replace clinical genetic assessment.

What Lifestyle Changes May Support Prostate Cancer Prevention?

Work towards a healthy weight

Excess body fat is more consistently associated with advanced or fatal prostate cancer than with the total risk of receiving any prostate cancer diagnosis. The biological reasons are still being studied, but may involve:

• Chronic low-grade inflammation
• Changes in insulin and insulin-like growth factors
• Altered sex hormone metabolism
• Adipokines, which are signaling substances released by fat tissue
• Difficulties in detecting prostate cancer in some men with obesity

Weight should be approached as a long-term health measure, not through crash dieting. For a man above his healthy weight range, gradual and sustainable weight loss can improve blood pressure, blood glucose, cardiovascular risk, and mobility even though the exact effect on prostate cancer risk cannot be predicted.

Waist measurement may provide useful information alongside body mass index because abdominal fat is closely connected with metabolic health.

Stay physically active

Physical activity helps regulate body weight, insulin sensitivity, inflammation, and cardiovascular fitness.

A practical programme might include:

• Moderate-intensity aerobic activities, such as brisk walking, cycling or swimming
• Muscle-strengthening exercise on at least two days each week
• Shorter periods of movement throughout the working day
• Reduced time spent sitting continuously
• Activities appropriate to existing medical conditions and fitness levels

The best routine is one you can sustain. Those who have been inactive or have heart, joint, or balance problems should consult a healthcare professional before starting vigorous exercise.

Follow a balanced diet

No recognised “prostate cancer prevention diet” has been proven to eliminate risk.

A balanced diet generally prioritises:

• Vegetables and fruit of different colours
• Wholegrains
• Beans, lentils and other pulses
• Fish and appropriate portions of lean protein
• Nuts and seeds in moderate quantities
• Unsaturated fats in place of excessive saturated fat
• Water instead of frequent sugar-sweetened drinks

Prostate Cancer Prevention Claims: What Does Evidence Actually Support?

The number of products marketed for prostate health can make it difficult to distinguish plausible research from clinically proven prevention. This comparison places common claims in context.

Why Supplements Are Not a Shortcut to Prostate Cancer Prevention

A supplement label may use terms such as “prostate support”, “antioxidant protection” or “men’s health” without proving that the product prevents cancer. Laboratory evidence that a substance affects cancer cells does not establish that swallowing it will safely lower cancer risk in people.

The Selenium and Vitamin E Cancer Prevention Trial, a large, randomised study sponsored by the US National Cancer Institute, found that selenium supplementation did not reduce prostate cancer risk. Men assigned to vitamin E alone had a 17% relative increase in prostate cancer incidence compared with those receiving a placebo.

Supplements can also:

• Interact with prescription medicines
• Affect bleeding risk
• Cause toxicity at high doses
• Provide substantially more of a nutrient than food would
• Create false reassurance that delays appropriate medical advice
• Vary in composition or concentration between products

Men should tell their doctor about vitamins, herbal preparations, and “prostate health” products they take. This is especially important before surgery or if they use anticoagulants, antiplatelet medicines, or treatment for other chronic conditions.

Can Medicines Prevent Prostate Cancer?

Finasteride and dutasteride are 5-alpha-reductase inhibitors. They reduce the conversion of testosterone into dihydrotestosterone and are commonly used for conditions such as benign prostatic enlargement. Large trials found that they reduced the overall number of prostate cancer diagnoses, particularly lower-grade cancers.

However, these medicines are not a simple prevention solution. Considerations include:

• Sexual side effects in some men
• Breast tenderness or enlargement
• Changes in semen volume
• A reduction in PSA levels that must be considered when interpreting test results
• Uncertainty over how the fall in diagnoses translates into prevention of lethal cancer
• The need to weigh potential benefits against harms for the individual

Anyone taking finasteride or dutasteride should inform the doctor who is interpreting their PSA result and should not stop or adjust a prescribed medicine without medical advice. These drugs should not be taken solely for prostate cancer prevention unless a doctor recommends doing so following an individual assessment.

Screening Is Not Prevention, but It Can Support Earlier Detection

PSA is a protein produced by prostate tissue. A blood test can measure its level, but PSA is not specific to cancer. Levels may rise because of benign prostate enlargement, inflammation, infection, recent procedures, or other factors.

There is also no single PSA value that perfectly separates cancer from non-cancerous conditions. A lower result cannot rule out cancer completely, while an elevated result does not confirm it.

This creates several potential outcomes from screening:

• A clinically significant cancer may be detected at a treatable stage.
• An abnormal result may lead to repeat testing, imaging, or biopsy but no cancer diagnosis.
• Screening may detect a slow-growing cancer that would never have caused illness.
• The investigation or treatment of an indolent cancer may expose a man to physical and psychological harm without extending his life.

Possible harms include anxiety, biopsy-related complications, and the effects of unnecessary treatment. These are the reasons PSA testing should be a shared decision rather than a routine test for every man.

Who Should Discuss PSA Testing with a Doctor?

Singapore’s Screening Test Review Committee classifies PSA screening as suitable for an individual-level decision. Men aged 50 to 75 with an estimated life expectancy of more than 10 years may be offered screening after discussing its potential benefits and harms. Testing may be considered earlier for men at higher risk, such as those with a strong family history.

The decision should account for:

• Age and overall health
• Expected life expectancy
• Personal preferences about knowing and investigating risk
• Previous PSA results
• Family history of prostate and related cancers
• Known inherited genetic variants
• Medicines that may alter PSA levels
• Whether the person understands the possible next steps after an abnormal result

For low-risk men with a low baseline PSA, testing may not always need to be repeated annually. The appropriate interval should be agreed with a doctor.

PSA screening is also different from testing performed because a man has symptoms or an abnormal clinical finding. When symptoms are present, the test is part of a diagnostic assessment rather than routine screening.

Build a Personal Prostate Cancer Risk Plan

Because risk varies between individuals, a personal plan is more useful than generic online advice. A good starting point is gathering the information a doctor would need.

Record detailed family cancer history

Write down which relatives had cancer, the cancer type, and their age at diagnosis. Include cancers on both sides of the family. A history of breast, ovarian, pancreatic, colorectal, or male breast cancer may be relevant to hereditary risk assessment, not only prostate cancer.

Review general health indicators

Blood pressure, blood glucose, cholesterol, body weight, and waist circumference do not diagnose prostate cancer. However, managing these indicators supports cardiovascular and metabolic health, which is important when making future screening or treatment decisions.

Discuss screening before ordering a test

Some health screening packages may include PSA testing without providing enough context about what happens after an abnormal result. Before testing, understand why the test is being done, how the result will be interpreted, and which further investigations might be recommended.

Revisit the plan when circumstances change

Risk assessment is not a one-time task. A new cancer diagnosis in a close relative, the discovery of an inherited variant, or a change in health may alter the balance of screening benefits and harms.

Take a Measured Approach to Prostate Cancer Prevention

While no measure can eliminate the risk of prostate cancer entirely, there are worthwhile steps men can take to reduce it. These include maintaining a healthy weight, exercising regularly, eating a balanced diet, avoiding unproven high-dose supplements, and understanding their family history.

Early detection should be approached just as thoughtfully. PSA testing may benefit some men, but the decision should reflect individual risk, health, and preferences rather than fear or a false promise of certainty.

If you are concerned about your prostate cancer risk, speak with your doctor about whether PSA testing or genetic risk assessment is appropriate. Those already diagnosed can consult our medical teams at NCCS for an individual evaluation, where treatment planning takes into account the cancer's stage and biological characteristics alongside each patient's health and priorities.

Frequently Asked Questions

1. Does benign prostatic hyperplasia turn into prostate cancer?
   No. Benign prostatic hyperplasia, or BPH, is a non-cancerous enlargement of the prostate and does not transform into prostate cancer. A man can have BPH and prostate cancer at the same time, however, and the two conditions may affect PSA levels. New or persistent urinary concerns should therefore be assessed rather than assumed to be BPH.
   
   
2. Does having a vasectomy increase prostate cancer risk?
   Current evidence does not establish that vasectomy causes prostate cancer. Some observational studies have reported small associations, while others have not. Differences in healthcare contact and testing may partly explain the findings. Vasectomy alone is not currently considered a reason for special prostate cancer screening.
   
   
3. Can prostatitis lead to prostate cancer?
   Prostatitis is an inflammation of the prostate and is not considered a precancerous condition. It can raise PSA temporarily and sometimes produce symptoms that require medical attention. A doctor may recommend treating the inflammation and repeating a PSA test later before deciding whether further investigation is needed.
   
   
4. Does frequent ejaculation prevent prostate cancer?
   Some observational studies have found an association between more frequent ejaculation and a lower rate of prostate cancer diagnosis. These studies cannot prove that ejaculation itself prevents cancer, and no medically recommended frequency has been established for prevention.
   
   
5. Should a man avoid testosterone therapy to reduce his prostate cancer risk?
   A man should not start, stop, or avoid medically indicated testosterone therapy solely based on general cancer claims. Treatment decisions require assessment of symptoms, hormone levels, prostate health, and other medical factors. Men receiving testosterone therapy should follow the monitoring plan  recommended by their doctor.