A blood test result can sometimes raise more questions than answers, especially when terms such as “tumour markers” appear in a report. While tumour markers can provide useful information, they are only one part of the larger picture when it comes to cancer detection and diagnosis.
Blood tests, cancer screening programmes, imaging studies, and clinical assessment all play important roles in identifying cancer and evaluating cancer risk. In Malaysia, many cancers are still diagnosed at later stages because early symptoms may be mild, vague, or absent altogether.
Understanding what tumour markers can and cannot tell you may help you make more informed decisions about your health and when to seek further medical evaluation.
Tumour markers are substances that may be produced by cancer cells or by the body in response to cancer. They are most commonly measured through blood tests, and in some cancers, it can be detected in the urine.
Many tumour markers are proteins, and abnormal levels may provide clues about the presence of certain cancers. However, tumour markers are not cancer-specific. Elevated levels can sometimes occur in non-cancerous conditions such as infections, inflammation, liver disease, or benign growths.
For this reason, tumour marker results should always be interpreted alongside a person’s symptoms, medical history, imaging findings, and other diagnostic tests.
Many of the most common cancers in Malaysia may not cause noticeable symptoms in their early stages. These include breast cancer, colorectal cancer, cervical cancer, lung cancer, prostate cancer, and liver cancer.
Because symptoms are often absent or non-specific early on, regular cancer screening plays an important role in early detection and to improve treatment outcomes.
Cancer screening is not limited to blood tests. Depending on a person’s age, sex, risk factors, and family history, screening may also involve imaging studies, endoscopic procedures, physical examinations, or laboratory investigations.
In some situations, tumour marker tests such as AFP, PSA, CA125, CA19-9, and CEA may be used as part of a broader assessment. However, these tests are typically interpreted alongside other clinical findings rather than used on their own.
In addition to conventional screening methods, advances in medical technology have introduced Multi-Cancer Early Detection (MCED) tests, which are designed to identify potential cancer signals from a single blood sample. These tests do not replace established cancer screening programmes, however, they may be considered as an additional screening option.
Individuals interested in learning more can explore Prince Court Medical Centre’s Multi-Cancer Early Detection Screening Programme.
Different tumour markers may be associated with different types of cancer and can help doctors assess cancer risk, monitor treatment response, or detect recurrence after treatment. However, tumour markers are not diagnostic on their own and must always be interpreted alongside other clinical findings. The gold standard for cancer diagnosis is tissue histology.
Tumour markers can be used for monitoring or to assess response to treatment if the diagnosis has been established and the marker was raised at disease diagnosis.
Not every cancer has a reliable tumour marker and not everyone has a raised tumour marker. For example, many colorectal cancer patients do also have normal tumour marker readings.
Cancer does not always cause symptoms in its early stages. However, persistent or unexplained changes in the body should not be ignored, particularly when they continue for several weeks or become progressively worse.
Common warning signs of cancer can include:
Unexplained weight loss
Persistent pain without an obvious cause
Ongoing fatigue
Unusual lumps or swelling
Abnormal bleeding or discharge
Difficulty swallowing or hoarseness
Changes in bladder or bowel habits
Skin changes such as sores that do not heal, new or changing moles, or unexplained changes in skin colour
It is important to understand that elevated tumour marker levels or abnormal tumour marker results do not necessarily mean a person has cancer. Some non-cancerous medical conditions such as inflammation, infections, benign growths, liver disease and hormonal conditions can affect tumour marker results. Tumour marker levels may also change during cancer treatment and are often used to help monitor treatment response over time.
This is why tumour marker results should always be interpreted by a doctor rather than used for self-diagnosis.
Not all cancers produce elevated tumour marker levels, particularly in their early stages. A normal tumour marker result does not completely rule out the presence of cancer, just as an elevated result does not automatically confirm it.
Cancer markers are only one part of a broader clinical assessment which should be interpreted alongside a person's symptoms, medical history, physical examination, imaging studies, and other diagnostic tests. For example, lung cancer often requires imaging studies such as chest X-rays or CT scans for detection and diagnosis, as tumour marker tests alone are not sufficient.
For this reason, tumour marker results should always be reviewed by a healthcare professional rather than used for self-diagnosis.
Diagnosing cancer involves much more than a single blood test. While tumour markers can provide useful information, doctors typically combine multiple diagnostic tools to form an accurate assessment, including a review of symptoms and medical history, physical examination, blood tests such as tumour markers, imaging studies like ultrasound, CT, MRI, PET scans, and biopsy to examine tissue under a microscope.
Each test provides different pieces of information, and it is the combination of these results that helps healthcare professionals confirm a diagnosis, determine the type and stage of cancer to guide treatment planning and ongoing care.
Abnormal screening results do not always mean cancer, just as normal results do not always rule it out. Understanding what your results mean requires careful interpretation within the context of your medical history, symptoms, risk factors, and any additional investigations.
If you have concerns about abnormal tumour marker levels, ongoing symptoms, or cancer screening results, seeking specialist advice can help provide clarity and determine whether further evaluation is needed.
At Prince Court Medical Centre, our oncology and cancer screening teams provide comprehensive assessment, diagnosis, and personalised care plans tailored to each individual's needs.
Book an appointment to discuss your results and next steps with our specialists.
Reviewed by Dr Lavannia Rajaratenam
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