Medical Oncologist
CION Cancer Clinics
Colon cancer that has spread to the lungs: what it means and what can be done | CION Cancer Clinics
Colon cancer that has spread to the lungs is still colon cancer, and it is treated with colon cancer medicines. For most people the main treatment is chemotherapy with targeted drugs. When there are only a few lung spots and the rest of the body is clear, removing or destroying them can sometimes make the disease potentially curable. This page explains how lung spots are confirmed, who is considered for treatment aimed at them, and what to ask. 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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The short answer
What does it mean if colon cancer has spread to the lungs?
It means some colon cancer cells have travelled through the bloodstream and started growing in the lungs. Doctors call these lung metastases, and they make the cancer stage 4. The spots are still made of colon cancer cells. They are treated with the medicines that work for colon cancer, not lung cancer.
Lung spots often cause no symptoms
Most people with lung spots feel nothing from them. The spots are usually found on a CT scan done at diagnosis or during follow-up. When symptoms do appear, the usual ones are a cough that does not settle, breathlessness, chest discomfort or coughing up blood. Lung spots from colon cancer often grow slowly, which gives the team time to plan.
A few spots can sometimes be curable
If the cancer has spread only to the lungs, and there are only a few spots, removing or destroying all of them can sometimes leave no visible disease. For some of these people the cancer is potentially curable. Only some people are suitable. The decision rests on the scans, your fitness and how the cancer behaves on treatment. Our page on surgery for lung metastases explains who is considered.
Lung surgery, focused radiation and ablation are carried out at accredited partner hospitals. CION's tumour board decides which, if any, fits your scans.The options
How are lung spots from colon cancer treated?
Most people need medicines first. Treatment aimed directly at the lung spots is added for some.
Chemotherapy and targeted drugs
This is the main treatment for most people, because cancer cells may be present in places too small to see. CION gives chemotherapy, targeted therapy and immunotherapy at its own centres. Which drugs fit depends on tumour tests such as RAS, BRAF and MSI, which look for particular changes in the cancer's genes. The regimens are explained on our chemotherapy for colorectal cancer page.
Surgery to remove the spots
A chest surgeon removes each spot with a small wedge of healthy lung around it, often by keyhole surgery. Most of the lung is left behind. CION's team plans this and it is carried out at an accredited partner hospital.
Usually considered when
- The bowel tumour has been removed or is controlled
- There are only a few spots
- Enough healthy lung will be left
- Any other spread can also be treated
Focused radiation or ablation
Stereotactic radiotherapy, often called SBRT, aims very precise beams at a small spot over a few visits. Ablation heats a spot through a thin needle. Both are options when surgery is risky or a spot sits deep in the lung, and both are arranged at partner hospitals.
When local treatment is not the answer
Treating the lung spots directly is usually not offered in these situations. Medicines then do the main work, sometimes for long periods.
- Many spots across both lungs
- Fluid around the lung caused by the cancer
- Cancer growing fast in other organs
- Breathing too poor to lose any lung
Not sure whether this applies to you?
Ask an oncologistFrom scan to plan
How do doctors tell whether a lung spot is cancer?
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A CT scan shows one or more spots
Small lung spots, called nodules, are very common. Many people have them from old infections, and in India healed tuberculosis is a frequent cause. A spot on a report is not automatically cancer.
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The radiologist compares it with older scans
A spot that has stayed the same for a long time is less worrying. Bring every earlier CT and its CD, including scans from other hospitals, because comparison is often the most useful test of all.
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Further tests if the answer is unclear
A PET-CT shows how active a spot is, though very small spots may not show up well. Sometimes a needle biopsy or a camera test into the airways is arranged through partner diagnostic teams. Read how PET-CT is used in colorectal cancer.
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Sometimes a planned wait and a repeat scan
A tiny spot may be too small to test safely. Repeating the CT after a few months shows whether it grows. This is a deliberate plan, not a delay, and the team should tell you when the next scan is due.
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The tumour board puts it together
Medical oncologists, surgeons and radiologists review every scan together. They decide whether the lung spots can be treated directly, and in what order with chemotherapy.
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Symptoms that cannot wait
If you have lung spots and you cough up blood, become suddenly short of breath, or get new chest pain, go to the nearest emergency department the same day. The same applies to a fever while on chemotherapy. Tell the doctor you have colon cancer and which treatment you are on. Do not wait for your next clinic appointment.
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Commonly believed
Four things families believe about lung spread, and what is true
"It has gone to the lungs, so now it is lung cancer."
The spots are colon cancer cells living in the lung. They look like colon cancer under the microscope and respond to colon cancer medicines. Treating them as lung cancer would mean using the wrong drugs.
"Once cancer reaches the lungs, nothing more can be done."
Many treatments still work. Medicines can control lung spread, sometimes for long periods, and a few spots can sometimes be removed or destroyed. For a smaller group, the disease is potentially curable.
"Every spot on the CT report is cancer."
Many lung spots are old scars from infection, including healed tuberculosis. The team compares scans and, where needed, tests a spot before calling it cancer. Ask what each spot on your report is thought to be.
"No cough means the lungs are clear."
Most lung spots cause no symptoms at all, which is why follow-up scans matter. Feeling well is good news about your general health. It does not replace the scan.
Being straight with you
What this page cannot tell you
It cannot tell you whether your lung spots can be treated directly. That depends on how many there are, their size and position, how well your lungs work, whether the bowel tumour is controlled and what the rest of your scans show. A tumour board that has seen your actual images answers that question.
It cannot predict how you will do
People whose scans look alike on paper can do very differently. Figures from studies describe large groups, not one person. Your oncologist can explain what the plan is aiming for once the full picture is known.
Who this does not apply to
If the cancer started in the lung itself, that is lung cancer, a different disease with different treatment. If the bowel cancer began in the rectum, start at the rectal cancer hub, because the plan for the rectum differs. If the scans also show spread to the liver, read our page on colon cancer that has spread to the liver.
Bring every scan report and CD, old and new, to the consultation. The comparison is often what settles the question.Questions we are asked
Common questions about colon cancer in the lungs
Is colon cancer that has spread to the lungs curable?
For some people, yes. When there are only a few lung spots, any other spread can be treated and the bowel tumour is controlled, removing or destroying every spot can make the disease potentially curable. Many people are not in this group, and the tumour board decides who is.
Is lung spread worse than liver spread?
Not necessarily. Lung spots from colon cancer often grow slowly, and limited spread to either organ can sometimes be treated directly. What matters more is how many spots there are, whether other organs are involved and how the cancer responds to medicines. Your oncologist will explain your own situation.
Can the lung spots be removed during the bowel operation?
Usually not in the same operation, because the lungs are in a different part of the body and need a chest surgeon. More often, the bowel and the lungs are treated in planned stages, with chemotherapy in between. The order depends on which problem is more urgent.
What is SBRT, and how does it compare with surgery?
SBRT is a very precise form of radiotherapy that treats a small spot over a few visits, without an operation. For small spots it can give good control. Surgery is often preferred when it is safe. The choice depends on the size and position of each spot and on how well your lungs work.
Will I still need chemotherapy if the spots are removed?
Usually, yes. Chemotherapy is often given before or after lung treatment, because cancer cells too small to see may be present elsewhere. Your oncologist decides the drugs and the timing. CION gives chemotherapy, targeted therapy and immunotherapy at its own centres.
Can a lung biopsy spread the cancer?
There is no good evidence that a needle biopsy spreads colon cancer through the lung. A biopsy is suggested only when the answer would change treatment. The main risks are a small air leak around the lung or some bleeding, which the team watches for afterwards.
Do we need to travel to Hyderabad for every visit?
Not always. Lung surgery means a short stay at a partner hospital, and focused radiation a few visits there. Chemotherapy and follow-up visits can often be planned at whichever CION centre is easiest to reach. Ask the team to group scans and visits so that each trip covers as much as possible.
How quickly do we need to act?
Lung spots should be reviewed promptly, but this is rarely an emergency unless breathing is affected. Take the time to have the scans seen by a tumour board that compares old and new images. Call the CION helpline and someone will tell you how to send your reports.
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
- American Cancer Society — Colon Cancer Treatment, by Stage
- American Cancer Society — Ablation and Embolization for Colorectal Cancer
- American Cancer Society — Radiation Therapy for Colorectal Cancer
- National Cancer Institute — Colon Cancer Treatment
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
Surgery for lung metastasesWho is considered for removing lung spots, and what the operation involvesOligometastatic disease: when few spots change everythingWhy a small number of spots opens options that many spots do notColon cancer that has spread to the liverThe other common site of spread, and the one most often treated with surgeryPET-CT for colorectal cancerHow the scan that confirms or clears a lung spot actually works
Talk to us
Lung spots on the scan, and no one has explained what they mean?
Send us the CT report and the earlier scans, and CION's tumour board will tell you whether the spots can be treated directly and what should come first. One helpline serves every CION centre.