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How TACE works: blocking the tumour's blood supply | CION Cancer Clinics
TACE works because a liver tumour feeds almost entirely from the hepatic artery, while healthy liver draws most of its blood from the portal vein. Chemotherapy is released into the tumour's artery, which is then blocked, so the tumour is soaked in drug and starved at once. This page explains that mechanism, why it fails in some people, and how it differs from other treatments. At CION Cancer Clinics, a multidisciplinary tumour board weighs your liver function and your scans before recommending any treatment.
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Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed October 2026, next review due October 2027
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On this page
- How does TACE actually kill a liver tumour?
- What does each part of TACE do to the tumour?
- What is the radiologist doing at each stage?
- How is TACE different from other liver treatments?
- When does the mechanism fail, and who should not have TACE?
- What this page cannot tell you
- Common questions about how TACE works
The short answer
How does TACE actually kill a liver tumour?
TACE works because a liver tumour and the healthy liver around it are fed by different blood vessels. A thin tube delivers chemotherapy into the artery feeding the tumour and then blocks it, so the tumour is soaked in the drug and starved of oxygen at the same time, while most of the healthy liver keeps its own supply.
The liver has two blood supplies
Most of the blood reaching healthy liver tissue arrives through the portal vein, which carries blood from the gut. A smaller share comes through the hepatic artery. Hepatocellular carcinoma (HCC, cancer that starts in the liver) behaves the other way round. As it grows, it builds its own network of small arteries and takes almost all its blood from the hepatic artery.
Why that difference matters
Blocking the artery to a tumour therefore hits the tumour hard, while the healthy liver nearby still gets blood from the portal vein. This is the whole idea behind TACE. It is also why the portal vein must be open and working, and why a tumour blocking that vein usually rules TACE out.
This page explains the mechanism. For what TACE is, who it suits and what to expect, start with TACE explained.Three effects at once
What does each part of TACE do to the tumour?
The word chemoembolisation joins two ideas: chemotherapy and embolisation, meaning blocking a vessel. A third effect, holding the drug in place, is what makes them work together.
Concentrated chemotherapy
The drug, usually doxorubicin, is released inside the tumour's own arteries. The tumour receives far more of it than it would from a drip into the arm, and the rest of the body receives far less.
Cutting off the blood
Tiny particles or beads then plug the small arteries. Without fresh blood, tumour cells run short of oxygen and food, and many of them die.
Keeping the drug in place
Because the blood flow has stopped, the chemotherapy is not washed away. It stays in contact with the tumour for longer, which is why the two parts work better together than either alone.
How it is held there
- Conventional TACE: an oily liquid, lipiodol
- Bead TACE: beads that release drug slowly
What it does not do
TACE does not reach cancer outside the liver, and it cannot treat tumour cells that are fed by another vessel the tube cannot reach. Small pockets often survive, which is why follow-up scans matter.
Not sure whether this applies to you?
Ask an oncologistInside the procedure
What is the radiologist doing at each stage?
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Mapping the arteries
After a small puncture at the groin or wrist, a fine tube is guided into the hepatic artery. Contrast dye is injected and X-ray pictures show every vessel. Tumours light up as tangles of new arteries.
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Getting as close as possible
An even thinner tube is threaded into the branch feeding the tumour. The closer it gets, the less healthy liver is affected. This is called a superselective approach.
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Delivering the drug mixture
The chemotherapy mixture or loaded beads are released slowly while the radiologist watches the flow on screen, so nothing travels where it should not.
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Closing the vessel
Blocking particles are added until blood flow into the tumour slows to a stop. A final picture confirms the target is covered.
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The tumour dies back over time
The effect is not instant. Tumour cells die over the following weeks. The follow-up scan shows how much tumour still has a blood supply, and that decides whether another session is needed.
Side by side
How is TACE different from other liver treatments?
Treatment
How it reaches the tumour
TACE
Chemotherapy into the tumour artery, then the artery is blocked
Bland embolisation
The artery is blocked with no chemotherapy added
TARE (Y-90)
Tiny radioactive beads go through the same artery and give radiation from inside
Ablation
A needle through the skin destroys a small tumour with heat
Systemic treatment
Immunotherapy or tablets travel through the whole body, inside and outside the liver
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Did you know
The oily liquid used in conventional TACE stays in the treated tumour and shows up brightly on later CT scans. Radiologists read where it has collected as a rough guide to how well the tumour was covered.
Who this does not suit
When does the mechanism fail, and who should not have TACE?
Because TACE depends on the portal vein keeping the healthy liver alive, it is usually not offered when tumour has grown into the main portal vein. It is also usually avoided when the liver is already failing, with deepening jaundice or fluid in the abdomen that is hard to control. In these people, blocking an artery can push the liver into failure. Read when TACE is not safe for the full list.
Tumours that resist the approach
Some tumours have a poor arterial blood supply, or draw blood from vessels outside the liver. Very large or scattered tumours may never be fully covered. Cancer that has spread beyond the liver needs treatment that travels through the body, such as immunotherapy for HCC.
Who arranges it at CION
CION's oncologists assess you and plan treatment at the tumour board. TACE itself is coordinated through NABH-accredited partner hospitals with interventional radiology, and your team will tell you where it takes place.
Being straight with you
What this page cannot tell you
It cannot tell you how your own tumour will respond. The mechanism is the same for everyone, but blood supply, tumour size, position and liver function differ from person to person, and so do results. Only your scans, read by a radiologist and discussed at a tumour board, can answer that.
It cannot choose between techniques for you
Whether conventional or bead TACE is used, and which drug, depends on the tumour and on the radiologist's experience. Evidence comparing them is mixed. Ask your team why they chose the technique they did; a clear answer is a good sign.
If you have a TACE plan and want a second opinion, bring your CT or MRI films and recent liver blood reports.Questions we are asked
Common questions about how TACE works
Why doesn't blocking the artery damage the whole liver?
Because the healthy liver gets most of its blood from the portal vein, not the hepatic artery. When the tumour's artery is blocked, the surrounding liver is still fed. Some healthy tissue near the tumour is affected, which is why liver function is checked before and after every session.
Does the chemotherapy go to the rest of my body?
A small amount does, but much less than with chemotherapy through a drip. Most of the drug stays trapped in the tumour. That is why hair loss and severe whole-body effects are less common, although tiredness and nausea can still happen.
How quickly does the tumour shrink?
Not straight away. Tumour cells die gradually over the weeks after treatment. A scan taken some weeks later shows how much tumour still has a blood supply. A dead tumour may look the same size at first but no longer lights up with contrast.
Why does TACE cause fever and pain afterwards?
As tumour tissue dies, the body reacts with inflammation. This causes pain under the right ribs, fever and nausea, called post-embolisation syndrome. It is expected and usually settles. Read post-embolisation syndrome for when it needs a call.
Can the tumour grow new blood vessels after TACE?
Yes. Starved tumours can grow new vessels or draw blood from nearby arteries. This is one reason repeat sessions are sometimes needed, and why TACE is being studied alongside medicines that block new vessel growth. That combination is still being researched.
Is bead TACE better than conventional TACE?
Neither has clearly proven better for everyone. Bead TACE releases the drug more slowly and may cause fewer whole-body effects. Conventional TACE leaves oily marker visible on scans. Read conventional vs bead TACE for how the choice is made.
Why is the portal vein checked before TACE?
The portal vein keeps the healthy liver alive once the artery is blocked. If tumour or a clot is blocking the main portal vein, the liver could lose both supplies at once. A contrast CT or MRI checks this before TACE is offered.
What happens if TACE stops working?
If tumours keep growing despite repeated sessions, or liver function falls, the team stops TACE and moves on. Options then include TARE, radiation, or immunotherapy and targeted tablets. Read when TACE stops working for how that decision is made.
Your Specialists
Meet CION's liver cancer specialists. Bring your scan reports and liver blood tests.
Our medical and surgical oncologists plan liver cancer care together, weighing the tumour and how well your liver works before choosing surgery, a liver-directed procedure or medicines.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
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Sources
- RadiologyInfo.org (RSNA/ACR) — TACE Cancerous Tumor Therapy
- American Cancer Society — Embolization Therapy for Liver Cancer
- National Cancer Institute — Liver Cancer Treatment
- EASL — EASL Clinical Practice Guidelines: management of hepatocellular carcinoma
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.
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