Medical Oncologist
Deciding on chemotherapy
Oncotype DX explained: what the recurrence score means
Oncotype DX reads a set of genes in your own tumour tissue and returns one number. That number answers a single question: how much benefit chemotherapy is likely to add on top of hormone tablets. It is not a rating of how serious your cancer is. This page explains the bands, what the score changes, and what it genuinely cannot tell you.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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The short answer
What does the recurrence score actually tell me?
Oncotype DX reads a set of genes in your own tumour tissue and returns a single number. That number answers one question: how much benefit chemotherapy is likely to add to hormone tablets in your case. A low score means very little. A high score means a real amount.
It is not a test of how bad your cancer is
This is the most common misreading. The score is a prediction about one treatment, not a severity rating. A woman with a large cancer can have a low score, and a woman with a small one can have a high score. Your stage is worked out separately and does not change.
Why the test exists
For years, everyone whose cancer had certain features was offered chemotherapy, and most of them would have done just as well without it. The test identifies who those people are, so they can be spared months of treatment they do not need. Avoiding unnecessary chemotherapy is its purpose.
It is designed for hormone sensitive, HER2 negative cancers. It is not used in HER2 positive or triple negative disease.On the report
The words on a genomic test report
- Recurrence score
- The single number the test returns. It predicts how much chemotherapy would add on top of hormone treatment.
- Low, intermediate and high
- The bands the score falls into. Low generally means chemotherapy can be left out. High generally means it is recommended.
- Absolute benefit
- The difference chemotherapy would make for you, expressed in percentage points rather than as a relative improvement. This is the figure worth asking for.
- Node negative and node positive
- Whether cancer had reached the lymph nodes. The score is read differently in each situation.
- Endocrine therapy
- Hormone tablets or injections. The score always assumes you will take these, because the question is what chemotherapy adds on top.
- Assay
- The laboratory test itself, run on your stored tumour tissue rather than on a new sample.
How it is done
What happens when the test is ordered
Nothing is done to you. Everything happens to tissue that has already been removed.
Your stored tissue is used
The laboratory that processed your surgery keeps the tumour in a wax block. A slice of that block is sent for testing, so there is no new biopsy and no procedure for you.
The sample travels
Most of these tests are run in a small number of laboratories abroad. Your hospital arranges the shipping and the paperwork, which is part of why the result takes a few weeks.
Ask who is arranging it and who to chase.A panel of genes is read
The test measures how strongly a set of genes is switched on in your tumour. Those readings are combined into the single score by a fixed formula, so the same tissue gives the same answer.
The result comes back to your oncologist
It arrives as a report with the score, the band and an estimate of what chemotherapy would add. Ask to see the report itself, not only the number read out to you.
Ask for
- The printed report
- Your absolute benefit figure
- What the recommendation is, and why
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Side by side
What the score changes, and what it does not
The score decides
The score does not decide
Whether chemotherapy is likely to add anything for you
Your stage, which was settled by surgery and pathology
How confidently chemotherapy can be left out
Whether you take hormone tablets, which is assumed either way
How the discussion with your oncologist is framed
Whether you need radiotherapy
Whether a borderline case tips one way or the other
How aggressive your cancer is, which grade describes
Being straight with you
What the test cannot do for you
The score is a good guide to one decision and useless for every other one. It cannot tell you whether your cancer will come back, and it cannot tell you how long you will live.
It is a group estimate applied to you
The number comes from how thousands of women with similar gene readings fared. It tells you what is likely, not what will happen. Two women with the same score can have different outcomes, and the test cannot distinguish between them.
Age and menopause change how it is read
In younger women who have not yet reached menopause, the same score has been read more cautiously, because part of the benefit chemotherapy appears to give in that group may come from its effect on the ovaries rather than on the cancer. Ask your oncologist how your age affected the interpretation.
It costs money and takes time
The test is not cheap and it is not covered by every scheme. Waiting for the result also delays the start of chemotherapy by a few weeks. Both are reasonable trade-offs when the decision is genuinely borderline, and neither is worth it when your oncologist already knows the answer.
Commonly believed
What families assume about the score
A high score means the cancer is advanced.
It means chemotherapy is likely to help. Stage describes how far the cancer has gone and is decided by size and nodes, not by this test. A high score in a small node-negative cancer is good news in one sense: there is something useful to add.
A low score means I am in the clear.
It means chemotherapy would add little on top of hormone tablets. Those tablets are still doing essential work over several years. A low score with untaken tablets is not a low risk situation.
Everyone with breast cancer should have this test.
It answers one question in one group: hormone sensitive, HER2 negative cancers where the chemotherapy decision is genuinely open. In HER2 positive or triple negative disease it has no role, and paying for it there is money wasted.
The test is more accurate than my oncologist.
It is one input. Your oncologist reads it alongside your age, your grade, your nodes and your own view on treatment. Where the score and the rest of the picture disagree, that disagreement is the conversation worth having.
Questions we are asked
Common questions about the recurrence score
Does a low score mean I can skip chemotherapy?
In the group the test was designed for, a low score is generally taken as sound grounds for leaving chemotherapy out and relying on hormone tablets. Your oncologist will still weigh your age, grade and node status before confirming it.
Do I need another biopsy for this test?
No. It is run on tissue already stored in a wax block from your surgery or biopsy. Nothing further is done to you. All that is needed is your consent and for the hospital to release the block.
How long does the result take?
Usually a few weeks, because the sample is shipped to a laboratory abroad. Ask your hospital for the expected date and for a contact to chase, because the wait is the part that most often goes wrong in practice.
Will my insurance cover it?
Coverage varies a great deal between policies and schemes, and many do not cover it. Ask for the cost in writing and check with your insurer before agreeing, rather than assuming it will be reimbursed afterwards.
What if my score is intermediate?
That is the band where the conversation matters most. Your age, your node status and your own attitude to risk all come into it. Ask for your absolute benefit figure in percentage points, so you are deciding on a number rather than a word.
Can I have the test if I have already started chemotherapy?
It becomes far less useful once treatment has begun, because the decision it informs has already been made. If you are considering stopping, raise it immediately rather than waiting, and ask what the test could still change.
Is it useful if my nodes were positive?
It can be, where only one or a few nodes were involved and the cancer is hormone sensitive and HER2 negative. The score is read more cautiously in that situation. Ask your oncologist whether it would genuinely change their recommendation.
Should I pay for it myself if it is not covered?
Only if the chemotherapy decision is genuinely open. Ask your oncologist one question first: if the score came back low, would you leave chemotherapy out? If the answer is no, the test will not change anything and the money is better kept.
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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.