Medical Oncologist
CION Cancer Clinics
Treatment when you are not fit for colon cancer surgery | CION Cancer Clinics
Being told you are not fit for surgery does not mean nothing can be done. It usually means the operation and the anaesthetic carry too much risk for you right now, and that judgement can sometimes change. Options include procedures through a scope, a stent for a blockage, medicines given at CION and care focused on comfort. This page explains each one and the questions worth asking. At CION Cancer Clinics, a multidisciplinary team plans colon cancer treatment for your stage, from surgery to chemotherapy and follow-up.
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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 does "not fit for surgery" actually mean?
- What treatment is possible if an operation is not safe?
- What makes someone unfit, and can it change?
- Can you be made fit enough for surgery later?
- Three things families assume, and what is actually true
- What this page cannot tell you
- Common questions when surgery is not possible
The short answer
What does "not fit for surgery" actually mean?
It means the risk of the operation and the anaesthetic is judged to be higher than the benefit of removing the tumour, at least for now. It is a judgement about your body today. It is not a judgement about the cancer, and it does not mean treatment stops. Other options remain, and some of them can keep the cancer and its symptoms under control.
Not fit now, or not fit at all?
These are two different answers, and families often hear only the second. A person who is weak from blood loss, recent weight loss or an infection may become fit after a few weeks of building up. A person with severe heart or lung disease that cannot improve may never be safe for a major operation. Ask which one applies, and what would have to change for the answer to change.
Who makes the call
The decision is shared between the surgeon, the anaesthetist and the medical oncologist, with your heart, lung or kidney specialist where needed. At CION, the case goes to the tumour board, which reviews the scans, the biopsy and your general health before agreeing a plan. CION's surgical oncologists plan any operation, and it is carried out at an accredited partner hospital.
Unfit for a large open operation does not always mean unfit for keyhole surgery or a smaller procedure. Ask about both.Your options
What treatment is possible if an operation is not safe?
The right choice depends on where the tumour sits, whether it has spread and what it is doing to you right now. Most people are offered more than one of these together.
Removal through a scope
Some very early cancers, found inside a polyp, can be removed during a colonoscopy without opening the abdomen. CION arranges this with a partner endoscopy team. When a bowel operation would normally follow but is unsafe, this smaller step is sometimes accepted as the main treatment.
Usually suits
- Small, early tumours
- Cancer that has not grown deep into the wall
A stent for a blockage
If the tumour is narrowing the bowel, a flexible mesh tube can be placed through a scope to hold it open. For someone who cannot have an operation, a colonic stent can relieve the blockage on its own. It is placed at a partner hospital.
Medicines given at CION
Chemotherapy, targeted therapy and immunotherapy can shrink or slow the cancer. Doses and drug choices are adjusted for frailty, often starting with one tablet-based drug instead of a combination. If the tumour is MSI-high, meaning its repair system is faulty, immunotherapy is often gentler than chemotherapy and can work well.
- Chosen from the markers on your biopsy
- Doses matched to your kidneys and stamina
- Reviewed before every cycle
Care for bleeding, pain and comfort
Iron, blood transfusions and occasionally a short course of radiation at a partner centre can control bleeding from a tumour. Palliative care teams manage pain, appetite and bowel trouble, and they work alongside any other treatment.
Comfort care can start on the day of diagnosis. It is not the same as giving up.Not sure whether this applies to you?
Ask an oncologistSide by side
What makes someone unfit, and can it change?
The problem
Can it improve?
Anaemia, a low haemoglobin, from a bleeding tumour
Often, with iron through a drip or a blood transfusion
Weight loss and poor nutrition
Often, with a few weeks of planned eating and supplements
Uncontrolled sugar or blood pressure
Usually, once medicines are adjusted
A weak heart or damaged lungs
Sometimes, after a specialist review, and sometimes not
Severe frailty, needing help with daily care
Rarely enough to make a major operation safe
Building you up
Can you be made fit enough for surgery later?
Correct the blood count
If bleeding has left the haemoglobin low, iron through a drip or a transfusion can lift it within weeks. Many people feel stronger and less breathless once it improves.
Feed the body
A dietitian builds up protein and energy with foods you already eat, such as dal, curd, eggs, milk and soft rice, and adds supplements if needed. Nutrition advice is part of care at CION.
Review every medicine and illness
Sugar control, blood pressure, blood thinners and kidney function are checked and adjusted. A heart or lung specialist may repeat tests to see whether the risk has really changed.
Walk, breathe and reassess
Daily walking and simple breathing exercises help stamina. The team then looks again. If the answer has changed, the operation is planned at a partner hospital. If not, the other options stay open.
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Commonly believed
Three things families assume, and what is actually true
"If surgery is not possible, nothing else can be done."
Medicines, stents and procedures through a scope all treat colon cancer without a major operation. The aim may shift from removing the tumour to controlling it, and treatment still goes on.
"Chemotherapy will be too strong for someone too weak for surgery."
Chemotherapy can be scaled down: one drug instead of two, lower doses, tablets at home instead of drips. The oncologist starts gently and adjusts after watching how the body copes. Some people are too unwell even for this, and a good team will say so honestly.
"One surgeon said no, so the answer is final."
Surgeons weigh risk differently, and keyhole surgery or a fitter body can change the answer. A second opinion, with every scan and every heart and lung report, is a reasonable step. No good doctor is offended by it.
Being straight with you
What this page cannot tell you
It cannot tell you whether you, or your parent, are fit for surgery. That needs an examination, blood tests, a heart and lung check and someone who has seen the scans. Two people with the same diagnosis can get opposite answers because their bodies are different.
It cannot predict how a treatment will work for you
Medicines hold colon cancer back for a long time in some people and only briefly in others. Your oncologist can explain what the treatment is aiming for in your situation, and how you will both know whether it is working. Ask that question directly.
Who this does not apply to
This page is about the colon. If the cancer is in the rectum, the lowest part of the bowel, radiation and other options work differently and the rectal cancer pages are the right place. If you are fit but unsure whether to have the operation, read refusing or delaying treatment instead.
Bring every report, every scan CD and a full list of medicines to the appointment. A fitness decision is only as good as the information behind it.Questions we are asked
Common questions when surgery is not possible
Can colon cancer be treated without surgery?
Yes, though the aim usually changes. Very early cancers can sometimes be removed through a colonoscopy. Larger tumours are treated with medicines, stents and comfort care that aim to control the cancer and its symptoms. For most colon cancers, removal remains the treatment most likely to clear it, which is why fitness is checked so carefully.
Who decides that someone is not fit for surgery?
The surgeon and anaesthetist make the main judgement, using blood tests, heart and lung checks and how active you are day to day. At CION the medical oncologist and the tumour board review it too, so the decision and the alternatives are agreed together and explained to the family in one conversation.
Is keyhole surgery safer for someone with heart or lung problems?
Sometimes. Keyhole surgery means smaller wounds and usually a quicker recovery. It still needs a full anaesthetic and can take longer on the table. For some people that makes it safer, and for others it does not. Ask the surgeon whether keyhole changes their answer for you.
What happens if the tumour blocks the bowel?
A blockage causes a swollen abdomen, vomiting and no wind or stool passing. That needs the emergency department the same day. For someone who cannot have an operation, a stent placed through a scope at a partner hospital can often open the bowel without surgery.
Can chemotherapy be given to someone who is frail?
Often, in a gentler form. The oncologist may use one drug instead of two, lower doses, or tablets such as capecitabine taken at home. The first cycles are watched closely and adjusted. Someone who is very unwell may be better served by comfort care alone.
Does immunotherapy help if surgery is not possible?
It can, if the tumour is MSI-high or MMR-deficient, meaning its repair system is faulty. This is found from the biopsy. In that group, immunotherapy is often easier to tolerate than chemotherapy and can control the cancer well. For most other colon cancers it does not help on its own.
Can someone become fit for surgery later?
Yes, sometimes. Correcting a low blood count, better nutrition, tighter sugar control and gentle exercise can change the picture within weeks. Medicines may shrink the tumour meanwhile. The team should reassess, rather than treat the first answer as permanent.
Where do we start if a doctor has said surgery is not possible?
Collect the scans, the biopsy report, recent blood tests and any heart or lung reports. Ask for a review by a medical oncologist and a tumour board. Call the CION helpline and describe the situation, and someone will tell you what the sensible next step is.
Your Specialists
Meet CION's colon cancer specialists. Bring your colonoscopy, scan or biopsy report.
Our surgical and medical oncologists plan colon cancer care together: which operation, whether chemotherapy is needed, and the follow-up that comes after.
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
- National Cancer Institute — Colon Cancer Treatment
- American Cancer Society — Colon Cancer Treatment, by Stage
- Cancer Research UK — Treatment for bowel (colorectal) cancer
- National Cancer Institute — Palliative Care in 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
Treatment in elderly patientsHow age and frailty shape every treatment choiceTreatment alongside diabetes, heart or kidney diseaseWhen another illness is the reason surgery is in doubtPalliative care alongside treatmentComfort care that runs beside every other optionGetting a second opinion on a treatment planIf you are not sure the first answer is the last word
Talk to us
Told that you or a parent cannot have the operation?
We can arrange for the tumour board to review the scans and reports, look at whether surgery is truly ruled out, and explain what else is possible. One helpline serves every CION centre.