How response is checked when scans are not the main test

Yes, for several cancers. Scans are the main tool for most solid tumours, but many cancers are assessed mainly or partly in other ways. Blood cancers are the clearest example. In leukaemia, response is judged by blood counts, the number of abnormal cells in the blood and bone marrow, and increasingly by very sensitive tests that can detect tiny amounts of leukaemia, called measurable or minimal residual disease tests. In myeloma, response is measured mainly by levels of abnormal proteins in the blood and urine, along with bone marrow tests, although scans are used for bone disease. Some lymphomas use scans, but blood counts and bone marrow tests may also be important.

Other cancers can be assessed by examination. Some skin cancers, mouth and throat cancers, and breast cancers treated before surgery can be seen or felt, and measured with a ruler or photographs, sometimes alongside ultrasound. Endoscopy, a camera test, helps assess some cancers of the food pipe, stomach, bowel or bladder. For some cancers, tumour markers such as PSA in prostate cancer or hCG in some testicular cancers play a central role, with scans used at specific points. In gestational trophoblastic disease, a rare pregnancy-related cancer, hCG levels are the main measure of response.

Between scans, all cancers are also monitored clinically. At each visit your team checks symptoms, examines you, reviews blood tests and considers how you are coping. Changes can prompt earlier scans or tests. Your oncologist will explain which tests are used to judge response in your cancer and when they will be done. This page explains the different approaches; it cannot interpret your own results.

Blood cancers use blood and marrow tests

Counts, abnormal cells and specific proteins measure response.

Some cancers can be seen or felt

Examination, photographs and ultrasound can track change.

Clinical monitoring never stops

Symptoms and examination are reviewed at every visit.

It cannot tell you what your blood counts, protein levels or marrow results mean. These need expert interpretation by your haematologist or oncologist in the context of your treatment.

It also cannot tell you which tests your cancer needs. Your team decides based on your diagnosis.

Why blood counts can be confusing

During chemotherapy, blood counts fall because treatment affects normal cells too. Low counts do not necessarily mean the cancer is growing, and recovering counts do not always mean the cancer has gone. In blood cancers, specialists look at specific patterns and abnormal cells, not just the overall numbers.

What bone marrow tests involve

A bone marrow test takes a small sample of liquid marrow and sometimes a tiny core of bone, usually from the back of the hip, under local anaesthetic. It can be uncomfortable for a short time. Results may take days to weeks, especially for detailed tests.

Residual disease tests

Very sensitive tests can find tiny amounts of leukaemia or myeloma that other tests miss. In some blood cancers, these results help decide whether to intensify, continue or reduce treatment.

Scans are still sometimes needed

Even when blood tests are the main measure, scans may be used for bone damage, enlarged glands or specific symptoms.

Keeping track

Keep copies of key results and letters. Ask your team to explain trends rather than individual numbers.

Anxiety about frequent tests

Frequent blood tests can cause worry about each result. Ask how and when results will be shared, and focus on the overall trend your team describes.

Children with blood cancers

Children often have regular blood and marrow tests. Play specialists and sedation can make procedures easier.

Myeloma proteins explained simply

Myeloma cells often make an abnormal protein, sometimes called paraprotein, and pieces of protein called light chains. Blood and urine tests measure these. When treatment works, levels usually fall. Your haematologist tracks them over time to judge response and to watch for changes.

Leukaemia response in stages

In acute leukaemia, doctors often check the bone marrow after the first phase of treatment to see whether abnormal cells have cleared, and repeat tests at later stages. Results guide whether to continue, intensify or change treatment, or consider a stem cell transplant.

Chronic blood cancers

In some chronic leukaemias, response is followed with blood counts and specialised blood tests that measure a specific genetic change in the leukaemia cells. These tests are repeated at intervals set by your haematologist.

Examination as a measure

For cancers that can be seen or felt, doctors may measure the size with callipers or a ruler and take photographs at each visit, so changes can be compared accurately over time.

Endoscopy during treatment

Endoscopy may be used to look at cancers in the food pipe, stomach, bowel or bladder during or after treatment, sometimes with small tissue samples taken.

Symptoms as part of assessment

In all cancers, symptoms such as bone pain, night sweats or weight changes are part of the picture, and your team asks about them at every visit.

Results from several tests

Doctors rarely rely on one test. They combine results from blood, marrow, examination, symptoms and scans where needed to form an overall judgement.

What to do next

Ask which tests measure your response, how often they will be done, when results will be discussed, and whether scans will also be needed; keep copies of key results; and report warning symptoms straight away.