Understand your breast cancer biopsy report, line by line
You are holding a page full of words nobody has explained to you. Here is what each line means — and which two actually change your treatment.
Six questions your report answers
Every breast biopsy report answers the same six questions. Two of them move your treatment more than the rest.
The report is a report card on the tumour, not on you. Like a soil test before you decide which crop to plant — the test doesn’t change the field, it decides the plan. It describes the tumour as it is today; it does not forecast the person, and no single line on it is a verdict.
Your report, block by block
Laboratories format reports differently, but almost all carry these blocks in roughly this order. Find each one on your own page.
Which breast, which side, how the sample was taken, when. Check it — a wrong side does occasionally appear, and it is easier to correct now.
Where the cells began. Tells you the starting point, not how serious it is. See the diagram ↓
Still inside the duct, or crossed its wall. Decides whether lymph nodes need assessing. Explained below ↓
How closely cells still resemble normal tissue. Not the same as stage. See the diagram ↓
Measured on the tissue removed. Can change once more tissue is examined.
The rim of healthy tissue around what was removed. Usually appears only after surgery. See the diagram ↓
Whether underarm nodes contained cancer cells. How nodes affect stage →
What fuels the cancer, and which treatments can work against it. Often issued days later. Why ↓
Can't match your report to this? Reports vary between laboratories. Send us yours and an oncologist will go through it line by line — no obligation.
Get my report explainedDecode a term from your report
Tap any word you can see on your page. Covers the terms that appear on most breast pathology reports.
Invasive
The cancer cells have crossed out of the duct or lobule where they started, into the surrounding breast tissue.
Why it matters: once cancer is invasive, the lymph nodes are assessed and the treatment discussion widens.
General explanations to help you follow your own report — not a diagnosis, and no substitute for your oncologist reading your case. If a word on your page isn't here, call 1800 202 8726.
All terms
- Carcinoma
- A cancer that began in the lining cells of an organ. On a breast report it simply names the family.
- Ductal
- Started in a milk duct — the tube. The most common type.
- Lobular
- Started in a milk-producing lobule — the gland. Harder to see on scans.
- In situ / DCIS
- Still contained inside the duct, wall not crossed. Still a cancer, still treated.
- Invasive
- Crossed out of the duct or lobule into surrounding tissue.
- Multifocal
- More than one area of cancer found in the same part of the breast.
- Grade
- How closely cells still resemble normal tissue, scored 1 to 3. Not stage.
- Nottingham score
- The scoring system behind the grade. Three features added together.
- Mitotic count
- How many cells were caught mid-division. One of the three grade features.
- Pleomorphism
- How varied the cell centres look. Another of the three grade features.
- Tubule formation
- Whether cells still form tube-like structures. The third grade feature.
- Ki-67
- A snapshot of how many cells were dividing at that moment.
- Necrosis
- Areas where cells have died inside the tumour. Noted, not alarming on its own.
- ER
- Oestrogen receptor. Whether the cancer responds to oestrogen.
- PR
- Progesterone receptor. Whether it responds to progesterone.
- HER2
- A separate growth signal, working by a different mechanism from ER and PR.
- Triple negative
- Negative for ER, PR and HER2. A different approach is used, often with strong response.
- Margin
- The rim of healthy tissue around what was removed.
- Lymph node
- Underarm filters. The report says how many examined, how many involved.
- Sentinel node
- The first node the area drains into — checked first as the gatekeeper.
- LVI
- Cancer cells seen inside small vessels near the tumour. One factor of several.
- pT / pN
- Shorthand for tumour size and node status as measured on the tissue itself.
- Skin / nipple involvement
- Whether the cancer has reached the overlying skin or the nipple.
- Histopathology
- The laboratory's examination of the tissue under a microscope.
- IHC
- Immunohistochemistry — the stains that check ER, PR and HER2. A block headed IHC is your receptor result.
- ISH / FISH
- A different test, used only when the HER2 result from IHC is borderline.
- Paraffin block
- Your tissue preserved in wax. The original — needed for any review.
- Frozen section
- A rapid examination done during surgery to guide the operation.
Invasive or in situ — the line that changes most
- In situ — the cells are still inside the milk duct, held in by the duct wall.
- Invasive — they have crossed that wall into surrounding breast tissue.
- Both are treated. The difference decides whether the lymph nodes need assessing, and how wide the treatment discussion goes.
Picture a water pipe running through a wall. In situ is water still inside the pipe. Invasive is water that has come through the pipe wall into the wall of the house. But don’t hear “in situ” as harmless — it is a cancer that has not yet crossed the wall, and it still needs treatment. People who read it as nothing sometimes delay care.
Three lines people misread
Each of these gets mistaken for something more alarming than it is.
Type — two starting points, not two severities
Ductal begins in the tube. Lobular begins in the gland. Neither name means milder or worse.
Like a dairy: one starts in the gland that makes the milk, the other in the pipe that carries it. Same building, different room. Not a severity split — lobular can be harder to spot on scans, so extra imaging is sometimes arranged, but that is detection, not danger.
Grade — how the cells look, not how far it spread
Grade 1 cells are still in neat rows. Grade 3 have stopped resembling normal tissue. Full explanation →
Stage is how far the fire has spread through the building. Grade is how hot it’s burning. Two different questions, answered separately. A higher grade sounds worse, but faster-dividing cells are often the ones treatment acts on most.
Margin — the border of clean tissue
"Clear" means no cancer cells were found at the cut edge. "Involved" means they reached it.
Like cutting a stain out of cloth with a border of clean fabric all the way around, so nothing is left behind. If the margin isn’t clear, a further procedure can be recommended — that is planned for from the start, not a sign the surgeon failed.
The receptor line — and why it takes extra days
- ER — oestrogen receptor. Does the cancer respond to oestrogen?
- PR — progesterone receptor. Does it respond to progesterone?
- HER2 — a separate growth signal, working by a different mechanism.
Together these describe what fuels the cancer, and therefore which treatments can work against it.
The cancer cell has locks on its surface. Hormones in your body are the keys. When a key turns a lock, the cell is told to grow. Blocking treatment either takes the keys away or jams the locks.
HER2 works differently — think extra antennae picking up the “grow” signal far too loudly, with targeted treatment capping the antennae. Keep the two separate in your head: they are different mechanisms and lead to different treatments, which is why the report lists all three.
The first report is the quick test. The receptor tests are the detailed one that takes a few more days — like a basic soil result coming back fast while the full mineral breakdown follows. Waiting is not losing time: starting before receptor status is known risks starting the wrong plan, and breast cancer is very rarely a same-week emergency.
The block and slides are the negative. The printed report is only the description of the photograph. Any second opinion or repeat receptor test needs the negative, not the description. You are generally entitled to request them — ask the laboratory how, keep the receipt, and store them with your reports.
What does my combination mean?
Set the three results as they appear on your report.
Hormone receptor positive, HER2 negative
The most common combination. The cancer responds to hormone signals, so treatment that blocks those signals is usually part of the plan, often over a number of years. Other treatments may be added depending on stage and grade.
General education, not advice about your case, and not a diagnosis. Your plan depends on stage, grade, general health and your own preferences — set by your oncologist after a multidisciplinary tumour board reviews the case.
The four combinations
Why your report is not your neighbour's report
Two women can both be told they have breast cancer and be given completely different plans. That is not a mistake, a cost decision, or one of them getting better care. The plan follows the report.
- Grade — how the cells are behaving
- Receptor status — what fuels it, and therefore what can block it
- Node result — whether it has reached the underarm nodes
Two people can both say “my car won’t start” and need completely different repairs. Same complaint, different cause, different fix. Neither plan is the better one — they are individual, never tiered by cost or by how hard anyone is trying.
Comparing plans with a relative or neighbour is one of the most common reasons people lose confidence in their own treatment. It is worth resisting.
Want a second opinion on your plan? Bring your report, your slides and your block. We will tell you honestly whether your current plan is the one we would recommend.
Book a second opinionWhat to do next
Get the complete report
If receptor results aren't on your page yet, ask when they're due. Don't plan treatment without them.
Request slides and block
The lab holds your tissue. Any second opinion needs it — not just the printout.
Build one file
Reports, scans, slides, prescriptions, ID and scheme card in a single folder.
Newly diagnosed and unsure what happens now? Your first 7 days, step by step →
Prefer to watch it explained?
Two short explainers covering the same ground as this page. Nothing loads or plays until you press it.
Support that comes with your treatment
Understanding the report is the first step. At CION these run alongside treatment, not as afterthoughts.
Nutrition
Appetite, weight and strength through treatment.
Psychology
Body image and identity support, patient and family.
Genetic counselling
Hereditary risk for you and close relatives.
Palliative care
Comfort and symptom support at any stage.
Pain management
Dedicated pain control as part of the plan.
Rehabilitation
Shoulder mobility and lymphoedema care.
We will go through it with you, line by line
An oncologist will read your report and tell you what it means for you — including whether a second opinion is worth getting. Bring the printout, and the slides and block if you have them.
Toll free 1800 202 8726 · Advancing Care. Passionately.