SABR for colon cancer in the UK

A precision radiotherapy for primary and Metastatic Colon Cancer

A stage 4 colon cancer diagnosis can leave you feeling that there are no further options to explore, especially if surgery is not possible or you have been offered treatment focused only on managing symptoms.

SABR is a targeted radiotherapy treatment used for selected people with colon cancer that has spread. We provide a careful, honest assessment of whether SABR treatment could be relevant to you.

Primary and secondary cancer

A clear assessment of whether the cancer is localised, has spread, or is progressing in only a small number of places.

Outpatient Treatment, No Hospital Stay

You attend for each session and go home the same day, with no overnight admission required.

1 To 5 Treatment Sessions

A short course of SABR radiotherapy, delivered in carefully planned outpatient sessions.

WHAT IS Colon CANCER?

Understanding your diagnosis before deciding on treatment

Colon cancer begins in the large bowel, usually developing from a growth called a polyp on the inner lining. When it is confined to the colon, surgery is usually the main treatment, often removing the affected section along with nearby lymph nodes.

Colon cancer can spread beyond the bowel, most often to the liver, and sometimes to the lungs, lymph nodes or lining of the abdomen. This is known as metastatic, or stage 4, colon cancer.

Not every diagnosis follows the same path. When the disease is confined to a small number of sites, there may be more room to consider treatment aimed directly at those areas.

Common symptoms of colon cancer

Rectal bleeding or blood in the stool
A persistent change in bowel habit
Abdominal pain or cramping
Abdominal bloating or a palpable lump
Unexplained weight loss
Fatigue or breathlessness, often linked to anaemia
Dark or black stools

Symptoms do not always mean cancer, but they should be checked, particularly if they are new, persistent or getting worse.

The main types of Colon cancer

Adenocarcinoma

The most common type of colon cancer, developing from the glandular cells that line the bowel wall.

Mucinous adenocarcinoma

A less common subtype that produces mucus and can behave differently, sometimes needing a tailored treatment approach.

Signet ring cell carcinoma

A rare, more aggressive subtype often diagnosed at a later stage, requiring careful specialist assessment.

Types Of Secondary Colon Cancer

Colon metastasis occurs when cancer that began elsewhere in the body spreads to the colon or rectum. This is uncommon and needs careful assessment alongside the primary cancer, scan results and any other areas of disease.

colon CANCER TREATMENT OPTIONS

Your treatment options for primary and Metastatic colon tumours

There is no one treatment route for colon cancer. Decisions are guided by the stage and location of the tumour within the bowel, whether it can be removed completely, and your general health.

Stereotactic Radiotherapy (SABR)

SABR delivers radiotherapy to a colon tumour in a small number of high-dose sessions. Beams are shaped to converge precisely on the tumour, sparing the surrounding bowel and nearby organs.

Endoscopic Resection

For very early-stage tumours confined to the lining of the bowel, small growths can sometimes be removed during colonoscopy, without the need for open or laparoscopic surgery.

Colectomy

Surgical removal of the affected section of colon, along with nearby lymph nodes, is the main treatment for colon cancer confined to the bowel. It can be performed as open or laparoscopic (keyhole) surgery, and is usually curative when the tumour is fully removed.

Colonic Stenting

When a tumour is causing a blockage, a stent can be placed to relieve the obstruction. This may be used to stabilise the bowel before surgery, or as a longer-term option when surgery is not suitable.

Systemic Treatment

Chemotherapy is commonly used after surgery to reduce the risk of recurrence in higher-risk cases, or as the main treatment where the cancer cannot be fully removed. Targeted therapy and immunotherapy may also have a role, depending on the tumour's molecular features.

WHAT IS SABR TREATMENT FOR colon CANCER

A Focused Alternative To Surgery For Colon Cancer

Every SABR treatment begins with detailed planning. Scans map the exact size and position of the tumour, along with the bowel, bladder and other structures nearby, so the radiation dose can be concentrated tightly on the cancer itself.

This precision is what allows SABR to be used for colon tumours in situations where surgery carries too much risk, and for cancer that has come back in the pelvis or abdomen after earlier treatment. Rather than repeating an operation, the tumour is treated directly with a short, targeted course of radiotherapy.

THE BENEFITS OF SABR FOR Colon CANCER

Why More Patients Are Exploring SABR Treatment for Colon Cancer

For people with colon cancer, the hardest part is often not knowing whether every reasonable option has been explored. This is especially true when surgery is not suitable, treatment has already been intensive, or scans show cancer in an area that needs a careful local approach.

SABR treatment for colon cancer is being explored by more patients because it offers a focused way to treat selected tumours without relying on a standard pathway alone. The decision is always individual. It depends on where the tumour is, previous treatment, overall health and whether SABR can be delivered safely.

Treatment is delivered as an outpatient. You attend for each session and go home the same day.

Because radiation is delivered externally, there is no wound and no anaesthetic.

Sessions are limited in number, agreed in advance as part of your treatment plan.

For patients whose health or previous treatment history rules out surgery, SABR remains an option.

SABR can achieve lasting local control of recurrent pelvic colorectal cancer in selected cases.

The dose is shaped to the tumour’s exact size and location, protecting the bowel and tissue around it.

Is SABR Right for You

When SABR Fits Into Colon Cancer Treatment

The decision to use SABR depends on the full picture, not one scan result alone. Your team will look at where the cancer is, how many areas are involved, previous treatment, your general health and whether the tumour can be targeted safely.

SABR is most relevant when colon cancer has spread to a small number of defined areas, rather than widely throughout the body.

When surgery is not suitable because of tumour position, medical risk or previous treatment, SABR can be reviewed as a local option.

SABR is used for selected colorectal liver metastases when local treatment is appropriate and surgery is not the best route.

For suitable colorectal lung metastases, stereotactic body radiotherapy is recognised as one of the local treatment options.

SABR can still be reviewed after earlier surgery, ablation or radiotherapy, depending on the site treated and the surrounding tissue.

If most disease is controlled but one site is progressing, SABR can target that area while the wider treatment plan continues.

SIDE EFFECTS OF colon SABR

What To Expect After SABR Radiotherapy For Colon Cancer

Most side effects from SABR are related to the exact area being treated. A tumour close to the bowel, bladder, stomach or liver carries different risks from a tumour in another part of the body. This is why planning is based on detailed imaging before any dose is delivered.

Your specialist team will explain which effects are likely, which are rare, and what symptoms to report after treatment.

Short-Term Effects

Longer-Term Effects

Not everyone develops side effects. Your risks should be discussed in relation to your own scans, previous treatment and the site being treated.

Private Health Insurance

Check Your Cover Before Treatment Starts

Private insurance may cover SABR when it is clinically recommended. Check your policy and secure approval before treatment begins.

Self-Funding Patients

Understand The Cost Before You Commit

If you are paying for SABR treatment yourself, you should receive a clear breakdown of what is included before treatment is arranged.

International Patients

Planning Care From Outside London Or Abroad

If travelling for colon cancer SABR, your consultation and scan review can often be arranged before your visit.

PAYMENT OPTIONS for SABRS

Clear Payment Guidance For Colon Cancer SABR

Whether treatment is covered by insurance or paid for privately, you should not be left guessing about costs. Once your scans and diagnosis have been reviewed, the team can explain the recommended treatment route and the likely fees involved.

Payment information is provided before treatment begins, giving you time to make a clear decision.

Getting started

The Route From First Contact To SABR Treatment for Colon Cancer

The aim of the process is to make sure SABR is planned carefully and used appropriately. Every step is based on your scans, treatment history and the clinical details of your case.

Enquiry And Information

You share your diagnosis, recent imaging and any treatment you are currently receiving or have already completed.

Consultation

Your specialist explains whether SABR fits your situation and what further information is needed before planning.

Detailed Scan Review

The tumour is assessed on imaging, including its size, position and closeness to the bowel or other organs.

Planning Appointment

Planning scans guide the treatment setup, positioning and radiation dose before treatment starts.

SABR Delivery

Treatment is given as outpatient radiotherapy, usually over a limited number of sessions.

Ongoing Review

Follow-up imaging and appointments monitor side effects, tumour response and the next stage of your treatment plan.

Is SABR painful during treatment?

No. You do not feel the radiation while it is being delivered. The session can feel unfamiliar because you need to lie still while the machine moves around you, but the treatment itself should not hurt.

How long does each SABR session take?

Most sessions take around 20 to 45 minutes, although much of this time is spent checking your position and confirming alignment before treatment starts. The radiation delivery itself is usually only part of the appointment.

Will I be radioactive after SABR?

No. SABR uses external beam radiotherapy, so radiation passes into the treatment area during the session and does not stay in your body afterwards. You can be around family members safely after treatment.

How soon does SABR start working?

Radiotherapy begins affecting cancer cells soon after treatment, but the result is not usually visible straight away. It can take weeks or months for scans to show whether the treated tumour has stabilised, reduced or changed.

Do I need a biopsy before SABR?

Not always. If your diagnosis and scans are clear, a biopsy may not be needed. If there is uncertainty about what a tumour is, or whether it represents colon cancer, your team may recommend further testing before treatment.

Frequently Asked Questions

We Know You Have Questions. Here Are The Honest Answers.

When you are facing cancer treatment, every question matters. The answers below cover what patients most often ask us, but they are only a starting point.

If you are unsure about anything, our team will take the time to understand your situation, explain things clearly and help you feel more informed about your options.

Speak to the Team

Connect With Our Clinical Team

Whether you have a specific question or simply want to understand your options, our team will provide clear guidance and an honest assessment of what treatment could look like for you.

You can reach us by filling in the contact form or calling us directly.