Deciding on chemotherapy
Recurrence score bands: low, intermediate and high explained
The bands turn your recurrence score into three practical answers. Low means chemotherapy is unlikely to add much to hormone tablets. Intermediate means it is a genuine judgement call. High means chemotherapy is likely to add a real amount. This page explains each band, how your age and node result change the reading, and the number worth asking for.
The short answer
What do the low, intermediate and high bands mean?
The bands group your recurrence score into three practical answers. Low means chemotherapy is unlikely to add much to hormone tablets. Intermediate means it is a genuine judgement call. High means chemotherapy is likely to add a real amount and is usually recommended.
Why bands rather than the raw number
The score itself is a continuous scale, and one point either way means nothing. The bands exist because treatment decisions are not continuous. You either have chemotherapy or you do not. Grouping the scores turns a scale into a decision.
Where the boundaries came from
They were set by following large groups of women for years and seeing where chemotherapy stopped making a measurable difference. They were moved once, as better evidence arrived. That is a sign the system is being corrected rather than a sign it cannot be trusted.
The boundaries are read differently depending on your age and whether any nodes were involved. Ask how yours was read.On the report
The words around your band
- Low band
- Chemotherapy is expected to add little on top of hormone tablets. Most women in this band are advised to skip it.
- Intermediate band
- The benefit is small but not nothing. This is where your age, your nodes and your own preferences carry the most weight.
- High band
- Chemotherapy is expected to add a meaningful amount, and it is usually recommended.
- Absolute benefit
- The difference chemotherapy would make for you, in percentage points. This is the number to ask for, rather than the band name.
- Relative risk reduction
- The same benefit expressed as a proportion. It always sounds larger, and it is the version that misleads people most often.
- Distant recurrence
- The cancer returning somewhere other than the breast. This is what the score is predicting the risk of.
Band by band
What each band usually means in practice
The band is a starting point for a conversation, not an instruction your oncologist has to follow.
A low score
You are generally advised to take hormone tablets and skip chemotherapy. This is a positive result, and it usually means avoiding several months of treatment you would not have benefited from.
Still important
- Taking the tablets for the full course
- Keeping your follow-up appointments
An intermediate score
The hardest band, and the one where your own view matters most. Your oncologist will bring in your age, your nodes and your grade, and should give you the benefit figure in plain percentage points.
Ask for that figure before deciding.A high score
Chemotherapy is usually recommended, and the expected benefit is large enough that most oncologists will advise it clearly. It does not mean your cancer is advanced.
When the band and the rest disagree
A high score in a tiny low grade cancer, or a low score in a high grade one, prompts a careful second look. Your oncologist may retest, or may weigh the rest of the picture more heavily.
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Side by side
The same band, read against your node result
Being straight with you
How to read your band without frightening yourself
The single most useful thing you can do with your band is convert it into a plain number. Ask your oncologist what chemotherapy would add for you, in percentage points, over the next ten years.
Why the plain number matters
A treatment described as cutting your risk by a third sounds compelling. If your risk was already low, a third of it is a very small change, and you may decide months of chemotherapy are not worth it. The same figure presented the other way can lead you to the opposite choice. Ask for it the honest way.
The band is not a prognosis
It predicts what chemotherapy adds, not what will happen to you. A high band does not mean your cancer will return, and a low band does not mean it will not. The band is about a treatment decision and nothing else.
What to do if you disagree with the recommendation
Say so, and say why. If the side effects worry you more than the risk does, that is a legitimate position and your oncologist should work with it rather than around it. A second opinion is also reasonable, especially in the intermediate band where reasonable doctors genuinely differ.
Commonly believed
What people assume about their band
Stage is worked out from the size of the cancer and whether it reached the nodes or beyond, and is settled before this test is run. Plenty of women with small, node-negative cancers score high. The band and the stage are separate facts.
The score is calculated on the assumption that you will take hormone tablets. It says chemotherapy adds little on top of them. Stopping the tablets removes the very treatment the low score depends on.
A single point is well inside the test's own margin of error, which is exactly why your oncologist looks at the wider picture near a boundary. Raise it as a question rather than treating the band as a wall.
They were revised once as longer follow-up became available. Adjusting a threshold on better evidence is how medicine is meant to work. It would be more worrying if nothing had ever been revised.
Questions we are asked
Common questions about the score bands
My score is intermediate. What should I do?
Ask for your absolute benefit in percentage points, then decide with your oncologist. Your age matters here, and so does your own view of the trade-off. This is the band where there is no single correct answer, and where taking a few days to think is reasonable.
Does a high score mean the cancer has already spread?
No. It predicts how much chemotherapy would reduce the chance of the cancer returning later. Whether anything has spread is answered by your nodes and, when needed, by scans. Those are entirely separate results.
Can my band change if the test is repeated?
Running the same tissue again gives essentially the same answer, so repeating it is not usually useful. Where the score sits right at a boundary and conflicts with the rest of the report, your oncologist may review the pathology instead.
Why is my band read differently because of my age?
In women who have not reached menopause, part of the benefit chemotherapy appears to give may come from its effect on the ovaries rather than on the cancer itself. That is why the same score is interpreted more cautiously in younger women.
What does the score say about my chances?
The report does include an estimate of the risk of the cancer returning, but that estimate assumes a particular treatment plan. Read it with your oncologist rather than alone, because applying a group figure to yourself is easy to get wrong.
Can I refuse chemotherapy with a high score?
You can refuse any treatment, and your team should keep treating you regardless. Before you decide, ask for the benefit figure and ask what the plan would be without chemotherapy. Make the decision on the numbers rather than on fear of the side effects.
Does the band change my radiotherapy?
No. Radiotherapy is decided by which operation you had and by your node result. The genomic score speaks only to whether chemotherapy is worth adding to hormone tablets.
Should I get a second opinion on my band?
It is most worthwhile in the intermediate band, where reasonable oncologists genuinely differ. Take the printed genomic report and your full pathology report, because a second opinion without both is just a second guess.
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Sources
- National Cancer Institute — Breast cancer gene expression tests
- Cancer Research UK — Tests to help decide on chemotherapy
- Breast Cancer Now — Tests to predict the benefit of chemotherapy
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.