Medical Oncologist
Before your operation
Why the clip placed before chemotherapy matters at surgery
A marker clip is a tiny piece of metal placed into the tumour through your biopsy needle. If chemotherapy given before surgery works completely, there is nothing left to see or feel, and the clip is the only thing showing your surgeon where the cancer was. This page explains what it enables, and why asking about it early genuinely matters.
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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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On this page
- Why is a clip put in before chemotherapy?
- From placement to the operating theatre
- What the clip actually buys you
- The vocabulary, in plain language
- Surgery with a clip, and without one
- What the clip does not do, and what can go wrong
- What women worry about when told a clip is being placed
- Common questions about the marker clip
The short answer
Why is a clip put in before chemotherapy?
Because the cancer may disappear. If chemotherapy given before surgery works completely, there is nothing left to see on a scan and nothing to feel. The clip is a permanent marker showing exactly where the tumour was, so the surgeon still knows what to remove.
What it actually is
A tiny piece of metal, smaller than a grain of rice, placed through the same needle used for your biopsy. It is designed to stay put and to show up clearly on a mammogram. Most people cannot feel it at all once it is in.
Why this is worth asking about yourself
It should be placed before or very shortly after chemotherapy begins. Once the tumour has shrunk away, it is too late, because there is no longer a target to aim the needle at. This is one of the few things in the whole pathway where asking early genuinely changes your outcome.
What happens without one
If the cancer disappears and no clip was placed, the surgeon has to work from the original scan pictures and remove a larger area to be confident of covering the site. That means more tissue than necessary, and a worse cosmetic result.
Ask at your next appointment: has a clip been placed, and which breast and position is it in?How it is used
From placement to the operating theatre
Placed at the time of biopsy
Usually through the same needle, at the same appointment, with the local anaesthetic already working. It adds a minute or two and most women do not notice a separate sensation.
A check picture confirms the position
A mammogram is taken straight afterwards to record exactly where the clip sits. This image becomes the reference point for everything that follows, so it is kept in your file.
It stays put through chemotherapy
You can have scans, travel, exercise and go through airport security normally. The clip is not affected by the treatment and does not move as the tumour shrinks around it.
It is localised before surgery
Shortly before your operation, a wire or a seed is placed to mark the clip, so the surgeon can find it once you are asleep and the breast has changed shape.
It comes out with the tissue
The removed piece is X-rayed in theatre to confirm the clip is inside it. That check is how the team knows the right area was taken, and the clip leaves your body with it.
Not sure whether this applies to you?
Ask an oncologistWhat it makes possible
What the clip actually buys you
It is a small thing that changes several of the biggest decisions later.
A smaller operation
With a precise target, the surgeon removes the site and a margin around it rather than a generous area guessed from old pictures. For many women this is the difference between a good and a poor cosmetic result.
Keeping the breast at all
Where the cancer has shrunk enough to allow conservation, the clip is often what makes that surgically possible. Without it, a mastectomy may become the safer option by default.
Ask whether the clip is enabling conservation in your case.A reliable response result
The pathologist needs to examine the original tumour bed to say whether any cancer remains. The clip tells them where to look, which is what makes the response result trustworthy.
Marking an involved lymph node
A clip is sometimes placed in a node that was positive on a needle sample, so that exact node can be found and checked at surgery rather than clearing the whole armpit.
Worth asking
- Was a clip placed in the tumour
- Was one placed in an involved node
- Is the check mammogram in my file
Words you will hear
The vocabulary, in plain language
- Marker clip
- The tiny metal marker placed in the tumour. Also called a tissue marker or a biopsy clip.
- Tumour bed
- The area where the cancer was, once it has shrunk or disappeared. This is what the surgeon removes.
- Localisation
- Placing a wire or seed just before surgery so the clip can be found in theatre.
- Specimen radiograph
- The X-ray taken of the removed tissue in theatre, confirming the clip came out with it.
- Clip migration
- The clip shifting slightly from where it was placed. Uncommon, and checked for before surgery.
- Targeted axillary dissection
- Removing a specifically marked node along with the sentinel nodes, rather than clearing the whole armpit.
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Side by side
Surgery with a clip, and without one
With a clip placed
Without a clip
The exact site is known even if nothing remains
The site is estimated from the original scans
A precise, smaller removal
A larger area removed to be confident
Breast conservation more often possible
Mastectomy more often chosen by default
The response result is reliable
The pathologist may not find the original bed
A marked node can be checked individually
The armpit is more likely to be cleared fully
Being straight with you
What the clip does not do, and what can go wrong
The clip marks a place. It does not treat anything, it does not tell anyone whether the treatment is working, and it has no effect on whether the cancer comes back. Its entire job is to answer the question of where to operate.
It can occasionally move
Clips shift slightly in a small number of cases, usually soon after placement as the tissue settles or as a bruise resolves. This is why a check image is taken at the time, and why the position is confirmed again before surgery rather than assumed.
It is not always enough on its own
Where the cancer was spread over a wide area, or where there was more than one focus, a single clip may not represent the whole disease. Some teams place more than one for exactly this reason. Ask how many you have.
What this page cannot tell you
It cannot tell you whether your surgery will be smaller, because that depends on how much the cancer shrinks and where it sits. What it can tell you is that the clip is a precondition for the smaller operation even being considered, which is why asking about it early matters so much.
Commonly believed
What women worry about when told a clip is being placed
A piece of metal will be left inside me forever.
It is removed with the tissue at your operation, and an X-ray in theatre confirms it came out. Even in the uncommon case where one is left, clips are made from materials designed to sit safely in the body indefinitely and cause no symptoms.
It will set off airport security or stop me having an MRI.
It will not set off scanners; it is far too small. Clips used for this purpose are made to be safe in an MRI scanner. Tell the MRI staff it is there, as you would with any implant, and they will confirm it from your records.
Placing it could spread the cancer along the needle track.
The needle track is not a route the cancer travels, and the clip goes through a needle that was already being used for your biopsy. Refusing it does not make you safer; it removes the marker your surgeon will need later.
Nobody mentioned a clip, so I probably do not need one.
Ask rather than assume. Practice varies between centres and the step is occasionally missed when a biopsy is done somewhere other than the hospital treating you. If chemotherapy is planned before surgery, raise it at your next appointment.
Questions we are asked
Common questions about the marker clip
Does placing the clip hurt?
Almost never as a separate sensation, because it goes through the same needle used for your biopsy while the local anaesthetic is still working. Most women say they were unaware it had happened until they were told. Any soreness afterwards comes from the biopsy itself rather than from the clip, and settles within a day or two.
Can I still have a clip if chemotherapy has already started?
Yes, provided the tumour can still be seen on a scan and targeted with a needle. This is why raising it early matters so much. Once the cancer has shrunk away completely there is nothing left to aim at, and the opportunity has gone. If you are one or two cycles in, ask this week rather than at your next scheduled visit.
Will I be able to feel it?
Almost certainly not. It is smaller than a grain of rice and sits within the breast tissue rather than under the skin. A small number of women with very little breast tissue report being aware of something, but it causes no pain and no restriction on activity.
What if the clip moves?
Slight movement happens in a small number of cases, usually soon after placement as the tissue settles. The position is checked with imaging before your surgery rather than assumed, so any shift is known about in advance. Where a clip has moved significantly, your team plans the operation around where it actually is.
Is more than one clip ever placed?
Yes, and it is worth asking about if your cancer involves more than one area or is spread over a wide region. A single marker may not represent the whole disease in those situations. Some teams also place one in an involved lymph node so that node can be checked individually at surgery.
Does it interfere with the scans during treatment?
No. It shows up as a small bright dot and radiologists expect to see it. If anything it helps, because it gives a fixed reference point for measuring how the area around it is changing from one scan to the next.
My biopsy was at another hospital. How do I check?
Ask your current team to request the biopsy report and the check mammogram from that hospital. The report will state whether a marker was placed. This is a common gap when care moves between centres, and it is worth chasing yourself rather than assuming the records were transferred.
Can it be placed if I am having surgery first?
It is usually unnecessary, because the tumour will still be there for the surgeon to find. Clips matter most where treatment given before surgery may make the cancer disappear. They are sometimes still used for small cancers that are hard to feel, which is a different purpose.
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Sources
- Cancer Research UK — Breast biopsy
- National Cancer Institute — Tissue marker
- Breast Cancer Now — Chemotherapy before surgery
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.