Medical Oncologist
CION Cancer Clinics
Cryoablation and irreversible electroporation for liver tumours | CION Cancer Clinics
Cryoablation freezes a liver tumour, and irreversible electroporation (IRE) kills it with short electric pulses. Neither uses heat, and neither is the usual first choice. They are kept for tumours that heat-based ablation cannot safely reach, such as one beside a bile duct. This page explains how they work, who they suit, and where the evidence is still thin. 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
- What are cryoablation and irreversible electroporation for a liver tumour?
- How do freezing and electric pulses kill a tumour?
- How do these compare with heat ablation?
- What happens if your team considers one of these?
- What do families often assume about these newer methods?
- Who should not expect cryoablation or IRE?
- What this page cannot tell you
- Common questions about cryoablation and IRE
The short answer
What are cryoablation and irreversible electroporation for a liver tumour?
Both are ways of destroying a liver tumour through a needle without using heat. Cryoablation freezes the tumour. Irreversible electroporation (IRE) uses short electric pulses that punch holes in cancer cells so they die. Neither is the usual first choice for liver cancer. They are kept for tumours that heat-based ablation cannot safely reach.
Why they exist at all
Most liver tumours that can be ablated are treated with radiofrequency or microwave ablation, which cook the tumour. Heat can damage a nearby bile duct or be carried away by a large blood vessel. Freezing and electric pulses behave differently near those structures, so they can sometimes treat a tumour that heat would put at risk.
Who this page is about
This page is about cancer that started in the liver, mainly hepatocellular carcinoma (HCC). If cancer has spread to the liver from the bowel or elsewhere, read about ablation for liver metastases, because those decisions are made differently.
Both techniques are offered in only a few centres in India. Ask early whether they are realistic for you.How each one works
How do freezing and electric pulses kill a tumour?
Both start the same way. A radiologist places one or more thin probes through the skin into the tumour, guided by a CT or ultrasound scan.
Cryoablation
Very cold gas flows through the probe and forms a ball of ice around its tip. The ice is visible on the scan, so the radiologist can watch it cover the tumour. Freezing and thawing are repeated, and the cancer cells burst and die.
Points to know
- The ice ball can be seen as it grows
- It is used more often for kidney tumours than for liver
- In the liver, bleeding is a known concern
Irreversible electroporation
Several probes are placed around the tumour. Very short, strong electrical pulses pass between them and open tiny holes in the cell walls that do not close. The cells die, while the framework of nearby bile ducts and vessels is largely spared.
Points to know
- Needs general anaesthetic and full muscle relaxation
- Pulses are timed to the heartbeat
- Still treated as specialised and less proven
What they share
No cut is made. Healthy liver around the tumour is mostly spared, which matters if you have cirrhosis (scarring of the liver). A scan afterwards checks whether any tumour is left.
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How do these compare with heat ablation?
Heat ablation (RFA, microwave)
Cryoablation or IRE
The usual choice for a small HCC
Kept for tumours heat cannot safely treat
Large body of long-term evidence
Far less evidence in liver cancer, mostly from smaller studies
Can injure a bile duct lying right beside the tumour
IRE in particular tends to spare ducts and vessels
Widely available in Hyderabad
Available in only a few centres, and IRE less often still
Often sedation is enough
IRE always needs a general anaesthetic
From scan to treatment
What happens if your team considers one of these?
The tumour board reviews the scan
At CION, oncologists, surgeons and a radiologist look at your triple-phase CT or MRI together. They first ask whether surgery, transplant or ordinary heat ablation would do the job. Only then do the newer methods come up.
Your liver and fitness are checked
Blood tests such as bilirubin, albumin and INR (a clotting test) show how well the liver works. For IRE, your heart is checked too, because the pulses are timed to your heartbeat and can upset an irregular rhythm.
A centre that offers it is found
CION coordinates ablation through NABH-accredited partner hospitals. Because few centres in India offer cryoablation or IRE for the liver, your team will tell you where it can be done, or whether travel is needed.
A scan checks the result
A follow-up scan some weeks later looks for any living tumour at the edge. Read about the follow-up scan after ablation to know what it is looking for.
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Commonly believed
What do families often assume about these newer methods?
"Newer must mean better, so we should ask for IRE."
For a small HCC that heat can reach safely, there is no good evidence that freezing or IRE works better. They are tools for difficult positions. Asking for them when heat would do is asking for the less proven option.
"If the tumour is beside a bile duct, nothing can be done."
A tumour near a duct may still be treated, with IRE, surgery, radiation or protective techniques during heat ablation. A difficult position narrows the choices. It rarely leaves none.
"Freezing is gentler, so there are no risks."
Any needle in the liver can cause bleeding, infection or damage to a neighbouring organ. Cryoablation in the liver carries its own bleeding concerns. Your radiologist will explain the risks for your tumour.
"Once it is destroyed, the liver is free of cancer for good."
The treated tumour may be gone, but a liver with cirrhosis can grow new cancers. Regular scans continue for years, whichever method was used.
Who this does not suit
Who should not expect cryoablation or IRE?
Most people with a small liver cancer will be offered heat ablation, surgery or transplant first, and that is the right order. These methods are not for large tumours, for many tumours across the liver, or for cancer that has spread into the portal vein (the main vein bringing blood into the liver) or outside the liver.
IRE has extra limits
Because IRE needs a deep general anaesthetic and pulses timed to the heart, it may not suit someone with a serious heart rhythm problem, some pacemakers, or a body too frail for a long anaesthetic. Metal stents near the tumour can also get in the way.
When another route is better
If your liver works well and the tumour can be removed, surgery may be offered. If you meet transplant criteria, a transplant treats the cancer and the cirrhosis together. Radiation such as SBRT for liver tumours is another way to treat a tumour in an awkward position.
Being unsuitable for these methods does not mean nothing can be done.Being straight with you
What this page cannot tell you
It cannot tell you whether either method suits your tumour. That depends on its exact size, position and neighbours on your scan, on your liver function and heart, and on whether a nearby centre has the equipment and the experience.
Where the evidence is thin
For HCC, most of what is known about cryoablation and IRE comes from small studies and single centres. Guidelines lean on heat ablation for small liver cancers, and treat these two as options for selected cases. Anyone presenting them as standard first treatment is going beyond the evidence.
It cannot predict your result
Outcomes depend on the tumour, the liver and whether new cancers appear later. Your oncologist can explain what is known for someone in your situation. For a general overview of the method, see cryoablation for cancer.
If a tumour has been called hard to ablate, bring the scan to a CION consultation for a second look.Questions we are asked
Common questions about cryoablation and IRE
Is IRE available for liver cancer in Hyderabad?
It is offered in only a small number of centres in India, and availability changes. CION coordinates ablation through accredited partner hospitals and will tell you honestly whether IRE is possible nearby, or whether another treatment would serve you just as well without travel.
Can these treatments be curative?
For a small HCC that is fully destroyed, any ablation is given with curative intent. The evidence for cryoablation and IRE in the liver is thinner than for heat ablation, so your team will be careful about what to expect. New tumours can still appear in a cirrhotic liver.
Is IRE the same as the NanoKnife I read about?
NanoKnife is a brand name for one IRE machine. The method is the same idea. Ask the treating centre which equipment it uses and how often its radiologists perform the procedure on liver tumours specifically, since experience matters a great deal with a newer technique.
Will I need a general anaesthetic?
For IRE, always. Your muscles must be fully relaxed so the pulses do not make them twitch. Cryoablation is sometimes done under deep sedation instead. The anaesthetist will check your heart, lungs and liver before the day.
What are the main risks?
Bleeding, infection, injury to a nearby organ and fever afterwards are possible with any liver ablation. Cryoablation can bleed more in the liver. IRE can briefly upset the heart rhythm. See risks and complications of liver ablation for the full picture.
Do these methods cost more than RFA?
Usually, because the probes and machines are specialised and fewer centres offer them. The amount varies widely by hospital and plan, so ask for a written, itemised estimate, and check with your insurer or scheme whether the specific method is covered.
Can the tumour be treated again if some is left?
Often, yes. A repeat ablation, surgery, TACE or radiation may be used for leftover tumour. Your team will decide after the follow-up scan. Our page on incomplete ablation explains the options.
Where do I start?
Bring your latest scans and liver blood reports to a CION consultation. The tumour board will look at the whole picture, including surgery, heat ablation and radiation, before suggesting a newer method. Call the helpline if you are unsure which reports to bring.
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
- American Cancer Society — Liver Cancer Ablation: RFA, MWA, Cryotherapy, PEI, Histotripsy
- EASL — EASL Clinical Practice Guidelines: management of hepatocellular carcinoma
- National Cancer Institute — Liver Cancer Treatment
- American Cancer Society — Treating Liver Cancer
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.
Keep reading
Related pages
RFA or microwave: which is better?The heat-based methods most people are offeredWhy tumour position can rule out ablationWhy some tumours need a different approachWho is suitable for liver ablation?Check whether ablation is on the table at allCryoablation for cancerHow freezing a tumour works, across cancers
Talk to us
Has your liver tumour been called hard to ablate?
Send us your scans and blood reports and our tumour board will look at every option, from surgery to newer ablation methods. One helpline serves every CION centre.