Medical Oncologist
Your report explained
ER and PR percentages: what low positive actually means
The ER percentage tells you how many cancer cells carry the oestrogen receptor, the docking point your own hormones attach to. The more cells that carry it, the more likely hormone tablets are to work. It is a prediction about treatment, not a score for how serious the cancer is. This page explains each band, including low positive.
MM
Medically reviewed by Dr. Muralidhar MuddusettyConsultant Surgical Oncologist · MBBS (AIIMS), MS (Surgery, AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh) · last reviewed September 2026, next review due September 2027
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The short answer
What does the ER percentage on my report mean?
The percentage tells you how many of the cancer cells carry the oestrogen receptor, a docking point that oestrogen attaches to. The more cells that carry it, the more likely the cancer is being fed by your own hormones, and the more likely hormone tablets are to work.
Why the receptor is looked for
Most breast cancers grow faster when oestrogen reaches them. If the receptor is present, treatment can work by cutting off that supply rather than by attacking the cells directly. That is a gentler and far longer treatment than chemotherapy, and it is the single most useful thing the receptor result tells your team.
ER and PR are two separate results
ER is the oestrogen receptor. PR is the progesterone receptor. Both are reported, usually as a percentage of cells stained and sometimes with a score for how strongly they stained. ER carries more weight in the decision. PR adds useful information alongside it.
A report may write these as ER positive, ER negative or ER low positive. Ask which band yours falls in.On your report
The bands, and what each is called
- ER negative
- Essentially no cells carry the receptor. Hormone tablets are not expected to help, and the plan is built around other treatments.
- ER low positive
- Only a small share of cells carry it. This band was introduced because these cancers often behave more like receptor negative ones.
- ER positive
- A clear majority of cells carry the receptor. Hormone treatment is expected to work and is usually the backbone of the plan.
- Allred or H-score
- Scoring systems that combine how many cells stained with how strongly they stained. Different laboratories use different ones.
- Immunohistochemistry, or IHC
- The staining test that produces these results. It is done on the tumour tissue itself, not on a blood sample.
- Endocrine therapy
- The general name for hormone tablets and injections. Endocrine simply means hormone.
Not sure whether this applies to you?
Ask an oncologistThe difficult band
What low positive actually means for you
This is the result that generates the most questions, because it sits between two clear answers.
It behaves more like negative
Cancers in this band tend to look and act like receptor negative ones, and hormone tablets are less reliably useful than the word positive suggests.
Tablets are often still offered
Because the possible benefit is real and the treatment is tolerable for most people, many teams still recommend it, while being honest that the expected gain is smaller.
Ask what benefit is expected in your case.Chemotherapy is weighed differently
In a strongly positive cancer, a gene test may show chemotherapy adds little. In a low positive one, that reasoning is weaker, so the decision is made on grade, size and node status instead.
A repeat test is sometimes worth asking about
Results near the boundary can vary with how the tissue was handled. If your result sits right at the edge and the decision turns on it, ask whether retesting is appropriate.
Worth asking when
- The result sits at the band boundary
- It conflicts with the grade or appearance
- The biopsy and surgery results disagree
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Side by side
How ER and PR are weighed
Oestrogen receptor (ER)
Progesterone receptor (PR)
The main result used to decide on hormone treatment
Supports the picture rather than deciding it
Positive with PR positive is the most hormone sensitive pattern
Negative alongside a positive ER is common and still treated
Negative means hormone tablets are not offered
Positive with a negative ER is unusual and usually retested
Read together with HER2 to name the subtype
Adds weight when gene testing is being considered
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Being straight with you
What the percentage cannot tell you
A higher percentage does not mean a milder cancer, and it does not predict how long you will live. It predicts one thing well: how likely hormone treatment is to help you.
It is not a measure of aggressiveness
Grade describes how abnormal the cells look. Stage describes how far the cancer has gone. The receptor result describes what the cancer responds to. People routinely read a high percentage as good news about severity, and that is not what it is measuring.
The test has limits
Staining depends on how quickly the tissue reached the laboratory and how it was fixed. Results from a small needle biopsy and from the surgical specimen sometimes differ. Where they do, your team usually treats on the result from the larger specimen.
What it cannot settle on its own
It cannot tell you whether you need chemotherapy. That is decided by the whole picture, and often with a gene test where the cancer is hormone sensitive, HER2 negative and the nodes are clear or barely involved. Ask whether that test applies to you before you accept or refuse chemotherapy.
Commonly believed
What people assume about receptor results
A high ER percentage means a mild cancer.
It means a hormone sensitive cancer, which is a different thing. Strongly receptor positive cancers can still be large, high grade or node positive. What the result promises is a treatment that is likely to work, not a gentle disease.
Hormone tablets are just a supplement, so I can skip them.
They are the main treatment for hormone sensitive breast cancer and they work over years, not weeks. Stopping early is one of the few decisions that measurably raises the chance of the cancer returning. If side effects are the problem, say so, because the tablet can often be changed.
ER negative means nothing can be done.
It means one route is closed, not all of them. Receptor negative cancers usually respond well to chemotherapy, and where HER2 is positive there are targeted treatments. Your oncologist will set out what applies to your subtype.
Eating soya or dairy will feed a receptor positive cancer.
Ordinary amounts of food have not been shown to drive breast cancer, and cutting out food groups during treatment usually causes weight loss when weight matters most. Eat normally, and put your effort into taking the tablets on time.
Questions we are asked
Common questions about ER and PR results
Is a higher ER percentage better?
It is better for one purpose: it makes hormone treatment more likely to work. It does not mean the cancer is less advanced or less serious. Read it as a prediction about treatment response rather than as a score for how bad the cancer is.
My ER is positive but PR is negative. Does that matter?
This combination is common and hormone treatment is still offered. It is generally taken as a slightly less hormone driven pattern than both being positive, and it is one of the details that feeds into whether a gene test or chemotherapy is discussed.
Why did my biopsy and surgery results differ?
A needle biopsy samples a tiny part of the tumour, and the staining can vary with tissue handling. Where the two disagree, teams generally rely on the larger surgical specimen. Ask which result your plan was built on if you were given both.
What is the difference between ER positive and hormone positive?
They are used to mean the same thing in everyday conversation. Hormone receptor positive usually means ER positive, PR positive, or both. Your report will list them separately, and the summary line will name the subtype.
Does a low positive result mean I should refuse tablets?
No, but it is a fair question to raise. Ask what benefit your oncologist expects in your case and what the alternative plan would be. A shared decision made with honest numbers is better than either automatic acceptance or automatic refusal.
Can the receptor status change later?
It can differ between the original cancer and a later recurrence, which is why a biopsy is often repeated if the cancer comes back. It does not change from month to month in an untreated tumour, so there is no need to retest during your current treatment.
Is triple negative the same as ER negative?
Not quite. Triple negative means ER negative, PR negative and HER2 negative together. An ER negative cancer that is HER2 positive is a different subtype with its own targeted treatment, so all three results have to be read together.
Should I ask for the Allred or H-score?
It is reasonable to ask, but the band your result falls in is what drives the decision. If your report gives only a percentage, that is normal practice. Ask instead which band you are in and what treatment follows from it.
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Sources
- Cancer Research UK — Hormone receptors and breast cancer
- National Cancer Institute — Hormone therapy for breast cancer
- Breast Cancer Now — Hormone receptor status
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.