What Is a Tumour Marker Test? Understanding Its Role in Health Screening

When people think about health screening, tests such as blood pressure, body weight, blood sugar and cholesterol may feel familiar.

Other tests commonly included in health screening programmes, such as tumour marker tests, may feel less straightforward and raise more questions.

Does a tumour marker test mean you are being checked for cancer? Does a normal result mean there is nothing to worry about? If the result is raised, does it always mean cancer?

The answer is not always straightforward.

Understanding what tumour marker tests can and cannot tell you may help you approach health screening with clearer expectations.

What Is a Tumour Marker Test?

A tumour marker test is usually a blood test that that measures the level of certain substances (known as tumour markers) in the blood.

These markers may be produced by cancer cells. They may also be produced by normal cells when the body responds to cancer or non-cancerous conditions.

Some tumour markers may be associated with cancers affecting the liver, prostate, ovaries, pancreas, digestive tract and other organs.

However, tumour markers are not diagnostic on their own. A raised tumour marker level does not always mean cancer is present. Likewise, a normal tumour marker result does not completely rule out cancer.

This is why tumour marker test results should be interpreted together with other health information.

Understanding Tumour Marker Tests in Health Screening Setting

In a health screening setting, tumour marker tests may be included to provide an additional point of reference.

They may help your doctor decide whether further assessment is needed, especially when reviewed alongside factors such as:

• Age
• Sex
• Family history
• Personal medical history
• Lifestyle habits
• Existing health conditions
• Symptoms, if any
• Other screening results

Health screening is not about looking at one number in isolation. It is about building a clearer picture of your overall health.

A tumour marker test may contribute to that picture, but it is not the whole picture.

Can a Tumour Marker Test Detect Cancer Early?

This is one of the most common questions people have.

Some tumour markers may be associated with certain cancers, but tumour marker tests are not always reliable as early cancer detection tools for the general population.

There are several reasons for this.

Some people with cancer may not have raised tumour marker levels, especially in the earlier stages. At the same time, some non-cancer conditions may also cause tumour marker levels to rise.

This means tumour marker tests can sometimes lead to unnecessary worry if the result is read without proper context. They may also give false reassurance if a normal result is mistakenly interpreted as ‘proof’ that there is no cancer.

For this reason, tumour marker tests, when done, are usually interpreted together with other tests and clinical findings and patients should also discuss with their doctors about the role and relevance of these tumor markers. Patients should also continue their routine age-appropriate screening tests as advised by MOH.

What Can Affect Tumour Marker Results?

Tumour marker levels can be influenced by different factors.

In some cases, a raised result may be related to cancer. In other cases, it may be linked to non-cancer conditions such as inflammation, infection, benign growths, liver conditions or other medical issues.

Certain lifestyle factors or existing health conditions may also affect the results or how results are interpreted.

This is why it is important not to panic when a result is outside the expected range. An abnormal result does not automatically mean cancer.

It means the result should be reviewed properly.

Common Examples of Tumour Markers

Different tumour markers may be used in the assessment or monitoring of certain types of cancer.

Common examples include:

• PSA
  PSA is commonly associated with the prostate conditions and may be included in screening for men, depending on factors such as age, risk factors and doctor’s advice. For selected men, PSA testing may also be considered after discussing the potential benefits and limitations with their doctor.
• AFP
  AFP may be alleviated in liver and certain germ cell tumours. AFP levels can also be increased in some non-cancerous liver diseases.
• CEA
  CEA may be elevated in colorectal cancer and some other cancers, but can also be raised in certain non-cancerous conditions.
• CA 125
  CA 125 may be elevated in ovarian cancer, but may also be raised in non-cancerous gynaecological conditions such as endometriosis, fibroids or even menstruation.
• CA 19-9
  CA 19-9 may be elevated in pancreatic and certain gastrointestinal cancers, although levels may also rise in some non-cancerous conditions.

These markers do not confirm cancer by themselves. They should be reviewed together with your overall health profile, symptoms, risk factors and other test findings.

What Happens If Your Tumour Marker Result Is Abnormal?

An abnormal tumour marker result does not mean you have cancer.

Your doctor may review your symptoms, medical history, previous test results and other screening findings. Depending on the situation, you may be advised to repeat the test, undergo further blood tests, arrange imaging tests or see a specialist for further evaluation.

The important thing is not to ignore the result or interpret it on your own.

Follow up is part of responsible health screening.

What Happens If Your Tumour Marker Result Is Normal?

A normal tumour marker result can be reassuring, but it should not be seen as a complete cancer check.

Some cancers may not result in a raised tumour markers. Some tumour markers may also remain within the normal range in the earlier stages of disease.

Depending on your age and risk profile, other screening tests may still be recommended. You are advised to discuss with your doctor regarding the age-appropriate cancer screening tests and continue your routine screening. These may include stool tests, mammograms, cervical screening, colonoscopy, ultrasound or other investigations.

Health screening works best when the results are reviewed as a whole.

Why Regular Health Screening Matters

Many health conditions may not cause symptoms in the early stages.

This is why health screening can be useful even when you feel well. Screening may help identify certain health risks earlier, allowing you to take practical steps towards follow up care, lifestyle changes or further assessment where needed.

In some situations, tumour marker tests may be performed as part of a broader clinical assessment with the indication and implications discussed with your doctor. They should never be regarded as a standalone measure of health or a definitive test for cancer.

The value of health screening lies in understanding your results in context.

Understanding Your Health Screening Results

Health screening is not about doing as many tests as possible. It is about choosing a screening programme that is relevant to your health profile and understanding what the results mean.

If tumour marker tests are included in your screening programme, take time to review the results with a doctor. Ask what each result means, whether follow up is needed and how it fits into your overall health picture.

At Healthway Screening Centres, our health screening programmes include a range of tests designed to provide a clearer view of your health, with medical review and follow up guidance where needed.

Find Out More About Our Screening Programmes