Medical Oncologist
CION Cancer Clinics
A colon cancer glossary: the words on your report, in plain language | CION Cancer Clinics
Colon cancer reports are written for doctors, so the words are short and unfamiliar. This glossary gives the plain meaning of the terms families meet most often, from polyp and biopsy to stage, margin, MSI, stoma and surveillance. It explains what each word describes. It cannot tell you what your own report means, and the doctor who ordered the test is the person to ask. At CION Cancer Clinics in Hyderabad, our oncologists explain colon cancer in plain words and plan care around you and your family.
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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
- Why does a colon cancer report use so many unfamiliar words?
- What do colon, polyp, adenoma and adenocarcinoma mean?
- What do the words on a colon biopsy report mean?
- What do T, N, M and the stage number actually say?
- What do the treatment words mean?
- What do resectable, recurrence and surveillance mean?
- What this glossary cannot tell you
- Common questions about colon cancer words
The short answer
Why does a colon cancer report use so many unfamiliar words?
Because each word is a shortcut between doctors, and nobody translated it for you. Colonoscopy, biopsy and staging reports are written for the next doctor in the chain, not for the family reading them on a phone at midnight. This page gives the plain meaning of the words you are most likely to meet, in roughly the order you will meet them.
How to use this page
Find the word on your report, read the meaning here, then read the report sentence again. Most sentences become ordinary once two or three words are unlocked. If you are new to the diagnosis, start with what colon cancer is. For the same words in Telugu, there is a Telugu version of this glossary.
Who this page does not suit
It will not interpret your own report. The same word carries a different weight depending on the words around it, and only the doctor who ordered the test can put them together.
A word on a report is a description, not a verdict.The organ and what grows in it
What do colon, polyp, adenoma and adenocarcinoma mean?
These four words appear on almost every colonoscopy report. Three of them are not cancer.
Colon, large bowel, large intestine
Three names for one organ: the wide tube that absorbs water from waste and stores stool until you pass it. The rectum is its last section and has its own hub, because rectal cancer is treated differently.
Parts you will see named
- Caecum and ascending colon, on the right
- Transverse colon, across the top
- Descending and sigmoid colon, on the left
Polyp
A small growth on the inner lining of the colon, like a bump or a mushroom on a stalk. Most are harmless, but some types can slowly turn into cancer, so they are removed and sent to the laboratory.
A polyp is not a cancer diagnosis. The biopsy says what kind it was.Adenoma
The type of polyp that can become cancer if left alone. Tubular, villous or tubulovillous describe its shape under the microscope. Dysplasia describes how disordered the cells look.
Adenocarcinoma
The medical name for the usual kind of colon cancer, starting in the gland cells of the lining. It tells you the type, not how serious it is. Seriousness comes from the stage.
Not sure whether this applies to you?
Ask an oncologistOn the biopsy report
What do the words on a colon biopsy report mean?
- Biopsy
- A small piece of tissue examined under a microscope. It is the only test that confirms cancer. A scan can suspect; a biopsy decides.
- Histopathology report
- The pathologist's written result. It names the type of cancer, how abnormal the cells look and, after surgery, how far it had grown.
- Grade, or differentiation
- How much the cancer cells still resemble normal colon cells. Well differentiated looks nearly normal; poorly differentiated does not.
- Margin
- The edge of the removed tissue. A clear margin means no cancer cells were found at the edge. An involved margin means some were.
- Lymph node
- A small bean-shaped gland that filters fluid from the bowel. The pathologist counts how many removed nodes contain cancer.
- MMR and MSI
- Two tests for whether the cancer can repair copying errors in its DNA. Results read deficient or proficient, MSI-high or MSI-stable. They change treatment choices and can point to an inherited syndrome.
- KRAS, NRAS, BRAF
- Genes checked inside the tumour. Wild-type means normal; mutated means changed. The result decides which targeted medicines can work.
- CEA
- A protein measured in the blood. It can rise with colon cancer and fall after treatment, but it is not a screening test.
The staging letter
What do T, N, M and the stage number actually say?
T is the tumour
How deeply the cancer has grown into the colon wall. T1 is the innermost layer; T4 means it has reached the outer surface or a neighbouring organ.
N is the nodes
Whether cancer was found in the lymph nodes removed with the bowel. N0 means none; N1 and N2 mean a few or several.
M is metastasis
Whether the cancer has spread to a distant organ such as the liver or lungs. M0 means no spread was found. M1 means it was.
The stage number puts them together
Stage one to stage four summarises T, N and M. The lower the number, the more the cancer is confined to the bowel. The full guide is colon cancer stages explained.
Clinical and pathological stage
A small c means the stage was estimated from scans. A small p means it came from the removed tissue, which is the stage treatment is usually planned on.
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In the clinic
What do the treatment words mean?
These come up when the tumour board has met and a plan is being explained to you.
Resection and colectomy
Resection means cutting out. A colectomy removes the part of the colon holding the cancer, with its lymph nodes. Anastomosis is the join the surgeon makes between the two cut ends.
Ways it is done
- Open, through one longer cut
- Laparoscopic, or keyhole
- Robotic, keyhole with a surgeon-controlled machine
Stoma, colostomy, ileostomy
A stoma is an opening on the abdomen so stool can leave into a bag. A colostomy is made from the colon, an ileostomy from the small intestine. Many are temporary; see will you need a stoma.
Adjuvant and neoadjuvant
Adjuvant treatment is given after surgery to lower the chance of the cancer coming back. Neoadjuvant treatment is given before surgery to shrink the tumour first.
Chemotherapy, targeted therapy, immunotherapy
Chemotherapy kills fast-dividing cells. Targeted therapy blocks a signal the cancer depends on. Immunotherapy helps your immune system attack the cancer and mainly suits MSI-high tumours. All three are given at CION centres.
Spread and follow-up
What do resectable, recurrence and surveillance mean?
- Metastasis
- Cancer that has travelled from the colon to another organ. It is still colon cancer, even in the liver, and is treated as one.
- Resectable
- Able to be removed by surgery. Some liver spread is resectable and can sometimes be curable. Only some people are suitable, and the tumour board decides.
- Recurrence
- Cancer that has come back after treatment, in the same place or elsewhere.
- Surveillance
- Planned check-ups, CEA tests, scans and colonoscopies after treatment. It is routine, not a sign that something is wrong.
- Palliative
- Treatment that controls the cancer and its symptoms when removing it is not possible. It is not the same as end-of-life care.
Being straight with you
What this glossary cannot tell you
It cannot tell you what your own report means for you. A word like margin or N1 is one line on a page the doctor reads as a whole, alongside your scans and your fitness. Two people with the same word can be offered different plans for good reasons.
Ask the person who ordered the test
If a word has frightened you, write it down and ask at the next appointment. Doctors expect the question. Reading the guide to your biopsy report first helps you know which words to ask about.
Who this does not apply to
If your report is about the rectum, the treatment path is different and you need the rectal cancer hub. If it is about piles, a fissure or a harmless polyp, most of this page is not about you at all.
Questions we are asked
Common questions about colon cancer words
Is a polyp the same as cancer?
No. A polyp is a growth on the bowel lining and most are harmless. Some kinds can slowly turn into cancer over years, which is why they are removed and examined. Only the biopsy report can say whether a polyp contained any cancer cells.
Does adenocarcinoma mean an aggressive cancer?
No. It is simply the name for the usual type of colon cancer, the one that starts in the gland cells of the lining. How serious it is comes from the stage and the grade, which are written separately on the report.
What is the difference between stage and grade?
Stage is how far the cancer has grown and spread, built from the T, N and M findings. Grade is how abnormal the cells look under the microscope. A cancer can be low grade but high stage, or the reverse, and treatment considers both.
My report says margins are clear. Am I finished with treatment?
Not necessarily. Clear margins mean the tumour was removed with a rim of healthy tissue. Whether chemotherapy is advised afterwards depends on the lymph nodes and other features on the report, which the tumour board weighs together.
What does wild-type mean next to KRAS?
It means the gene is normal, with no mutation found. One group of targeted medicines works only when KRAS and NRAS are wild-type, so it opens that option. Mutated means a change was found and a different medicine is chosen.
Is a stoma always permanent?
No. Many stomas after colon surgery are temporary, made to let a join heal, and are reversed in a later operation. Whether yours would be temporary depends on where the tumour is and what the surgeon finds. Ask before the operation.
Does palliative mean the doctors have given up?
No. Palliative treatment aims to control the cancer and its symptoms when removing it is not possible. People can have palliative chemotherapy for a long time, alongside supportive care. It is not the same as end-of-life care.
Why does the pathologist count the lymph nodes?
Because the number of nodes containing cancer sets the N stage, and the N stage weighs heavily in the decision about chemotherapy after surgery. Examining enough nodes makes that stage reliable, which is why the count appears on the report.
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 — Surgical Pathology Reports
- Cancer Research UK — Stages, types and grades of bowel cancer
- American Cancer Society — Colorectal Cancer Stages
- 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
A colon cancer glossary in TeluguThe same words with their Telugu meanings, to share with familyReading your colon biopsy reportHow the words fit together on a real reportColon cancer stages explainedWhat T, N, M and the stage number mean for treatmentWhat is colon cancer?Start here if the diagnosis is new
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