Rising Tumor Markers but Stable Scans: What It Means

This page is for people whose tumor marker blood test is rising while their scans look unchanged. It explains why the two can disagree and why teams often watch and repeat tests before changing treatment.

Your blood marker has gone up. Your scan looks the same as last time. You are being told to wait and repeat.

This combination is one of the harder places to sit. The blood test suggests something may be changing; the imaging offers nothing to point at. NCI says measuring tumor markers periodically after treatment may be used to check for recurrence.

NCI says tumor markers are not perfect. They often do not identify everyone with the disease, and they may suggest cancer in people who do not have it.

The rise may not be from cancer. NCI says noncancerous conditions can sometimes increase the level of a tumor marker. For PSA, NCI lists benign prostatic hyperplasia (BPH) and prostatitis, and says an infection or inflammation of the prostate or a recent prostate biopsy can raise PSA for a month or two. Vigorous exercise such as cycling and ejaculation can also raise it briefly.

The rise may be real before anything shows on a scan. For PSA, NCI says a biochemical relapse typically appears months or years before the recurrence causes symptoms. A scan can only show what is large enough to see.

For PSA, NCI says the doctor may look for a trend of rising levels over time rather than a single elevated value. The usual approach is to look at the whole picture:

1. Repeat the marker after an interval your team chooses.
2. Review anything that could have raised it, such as recent illness, procedures, or new medicines.
3. Look at the trend across several values rather than a jump between two.
4. Consider imaging if the trend continues.
5. Reassess the plan if imaging changes or if symptoms develop.

Your own account of how you feel matters throughout. Call your care team right away about new pain, weight loss, breathlessness, fever of 100.4 F or higher, or any symptom that worries you, rather than saving it for the next appointment. For severe symptoms such as trouble breathing, call 911.

Do not stop or change any treatment on your own because of a marker result. Your oncologist decides that with you.

The waiting is the difficult part, and it is difficult for reasons that have nothing to do with how well you are coping. Some things that help:

• Ask for a specific date for the repeat test, not a vague timeframe.
• Ask what result would be reassuring and what result would lead to action.
• Ask who to call if something changes before then.

Knowing the shape of the plan makes an uncertain interval more bearable than knowing nothing at all.

If the anxiety is affecting sleep, appetite or your ability to function, tell your team. Many cancer centers have counselors, psycho-oncology services or nurse navigators.

A rising marker with a stable scan is not a diagnosis of progression, and it is not your team ignoring a warning. It is a signal being checked.

• NCI — Tumor Markers Fact Sheet
• NCI — Prostate-Specific Antigen (PSA) Test
• NCI — Adjustment to Cancer: Anxiety and Distress (PDQ)