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Understanding Your Diagnosis

The first days after a diagnosis arrive with a new language. This glossary translates the words you will hear, staging, grading, margins, remission, into gentle plain English, so appointments feel less like a foreign country.

One promise held everywhere on this page: no statistics, no percentages. What any word means for you personally is a conversation for your own care team.

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Words in your diagnosis8

Benign and malignant
Benign means a growth is not cancer: it may still need attention, but it does not spread. Malignant means the cells can grow into nearby tissue and may travel elsewhere, which is what makes something a cancer. The word malignant describes behaviour, not destiny: it is the reason treatment exists, not a sentence.
Tumour
Simply a lump or mass of cells. On its own the word says nothing about whether it is benign or malignant, which is why doctors rarely stop at this word and why a biopsy usually follows.
Staging (stage 1 to 4)
Staging describes where a cancer is: how large it is and whether it has moved beyond where it started. Lower numbers mean more contained; higher numbers mean it has travelled further. The stage helps your team choose the right plan. Every stage, including stage 4, has treatments, and what a stage means for you personally is a conversation for your own oncologist, who knows far more than the number.
Worth asking: “What does my stage mean for the choices in front of us?”
TNM (letters next to your stage)
A more detailed way of writing the stage: T describes the tumour itself, N whether nearby lymph nodes are involved, and M whether it has travelled further. The letters and numbers pack a lot of information into a small code your team reads at a glance.
Grading (grade 1 to 3)
While staging says where a cancer is, grading says how the cells look under the microscope: grade 1 cells look close to normal and tend to grow slowly, grade 3 look more changed and tend to grow faster. Grade helps predict how the cancer behaves, which shapes how confidently your team can plan.
Metastasis (secondary cancer)
When cancer cells travel from where they started and settle somewhere else, the new spot is called a metastasis or secondary. It is still the original cancer (breast cancer in a bone is treated as breast cancer, not bone cancer), which matters because treatment follows the original type.
Lymph nodes
Small bean-shaped filters throughout the body that drain tissue fluid. Because they are the body's checkpoints, doctors examine the nearby ones to learn whether a cancer has begun to travel: it is one of the most useful pieces of the picture.
In situ
Latin for "in place": abnormal cells that are sitting exactly where they began and have not grown into anything around them. Finding a cancer in situ is finding it about as early as it can be found.

The people around you4

Oncologist
A doctor who specialises in treating cancer. You may meet more than one kind: medical oncologists (medicines), radiation oncologists (radiotherapy) and surgical specialists, depending on your plan.
Multidisciplinary team (MDT)
Behind your appointments, a whole group meets to discuss your case together: surgeons, oncologists, radiologists, pathologists and specialist nurses. Treatment recommendations usually come from this shared discussion, so you are never relying on a single opinion.
Worth asking: “Has my case been discussed by the team, and what did they recommend?”
Pathologist
The doctor you may never meet who examines your biopsy under the microscope and writes the report that names the cancer, its type and its grade. Much of your plan flows from this careful, unseen work.
Palliative care
Care focused on comfort and quality of life: easing symptoms, pain and worry. Many people meet palliative teams early, alongside active treatment, because feeling better helps everything else. The word does not mean treatment has stopped or that time is short; it means a team is looking after how you feel.

Treatment words8

Chemotherapy
Medicines that attack cells which divide quickly, cancer's defining habit. Because some healthy cells also divide quickly (hair, blood, the gut lining), side effects happen, and because those healthy cells recover, most side effects ease after treatment. Modern supportive medicines manage far more of this than most people expect.
Radiotherapy
Precisely aimed high-energy beams that damage cancer cells in one targeted place. Planning takes longer than treating: machines shape the dose to the tumour while sparing what is around it. Each session is short and painless, like having a scan.
Immunotherapy
Medicines that help your own immune system recognise and attack cancer cells, which are skilled at hiding from it. One of the most hopeful developments in modern oncology, already standard care in a growing list of cancers.
Targeted therapy
Medicines designed around a specific feature of your particular cancer's cells, found by testing the tumour itself. This is why doctors sometimes run extra tests on a biopsy before choosing medicines: they are looking for a target.
Hormone therapy
Some cancers, notably many breast and prostate cancers, use the body's own hormones as fuel. Hormone therapy turns that fuel supply down. It is usually taken over a long period and is often the quiet workhorse of a treatment plan.
Adjuvant and neoadjuvant
Adjuvant treatment is given after the main treatment (often surgery) to deal with any cells too small to see. Neoadjuvant is given before, usually to shrink things first and make the main treatment work better. Both words mean your team is thinking several moves ahead.
Clinical trial
A carefully supervised study of a promising treatment. Being offered a trial is not being experimented on as a last resort: trials carry strict safeguards, and joining one is always a choice, never an obligation.
Worth asking: “Is there a clinical trial that fits my situation?”
Margins (clear margins)
When a surgeon removes a tumour, they take a rim of healthy tissue around it. If the pathologist finds no cancer cells at the edge of that rim, the margins are "clear", welcome words that mean the visible cancer was removed with room to spare.

Tests and scans4

Biopsy
Taking a small sample of tissue so it can be examined under a microscope. It is the single most definitive test in cancer care: scans suggest, a biopsy confirms. Most are quicker and more comfortable than people fear.
CT, MRI and PET scans
Different ways of photographing the inside of the body: CT uses X-rays for a detailed 3D picture, MRI uses magnets and is especially good at soft tissue, and PET highlights areas of unusually active cells. Your team picks the scan that answers the question in front of them.
Tumour markers
Substances in the blood that some cancers release, which can help follow how treatment is going. They are trend lines, not verdicts: a single number means little, and many things besides cancer can nudge them.
Histology report
The pathologist's written description of your tissue sample: the cancer's exact type, grade and features. It reads as dense jargon because it is written doctor-to-doctor; your oncologist will translate the lines that matter for you.
Worth asking: “Could you walk me through the key lines of my histology report?”

Words about the future5

Prognosis
A doctor's considered view of how things are likely to go for you, built from your cancer's type, stage, grade, your health and how treatment responds. It is personal and it moves as facts change. Numbers you find online cannot know any of this, which is why the only prognosis worth hearing is the one your own oncologist gives you, in person, with the full picture.
Worth asking: “When we talk about my outlook, what does it rest on in my particular case?”
Survival statistics
Figures you may meet online describe large groups of people diagnosed years ago, treated with yesterday's medicine, averaged together. They cannot describe one person, and they trail years behind current treatment. We deliberately publish none of them here: your team's view of your situation will always be more accurate, more current and more yours.
Remission
When signs of the cancer have shrunk (partial remission) or can no longer be detected at all (complete remission). Doctors choose this careful word rather than "cured" early on simply because they promise only what they can measure; many people in complete remission stay there.
Recurrence
A cancer that returns after treatment. This is exactly what follow-up appointments exist to watch for, which is why keeping them matters even when you feel completely well: anything found early is met early.
Follow-up (surveillance)
The scheduled check-ups, scans or blood tests after treatment ends. Think of it as your team staying in your corner: most visits end in reassurance, and the routine itself is a form of care.

Sources

  1. Cancer: overview NHS
  2. Cancer information and support: understanding your diagnosis Macmillan Cancer Support
  3. Dictionary of cancer terms US National Cancer Institute

Last reviewed: 2026-07-16

Why we publish no numbers

Search any cancer term online and statistics arrive uninvited: survival rates, risk figures, averages. They describe thousands of strangers diagnosed years ago, treated with medicine that has since moved on, and they know nothing about you, your cancer's exact features, or how it responds to treatment. For one person reading about their own life, they are almost always misleading, usually in the frightening direction.

So this site holds a simple editorial line: gentle words, honest explanations, and not a single prognosis figure. The questions the numbers pretend to answer are real and deserve real answers, from your own oncologist, who has the full picture. Our question builder can help you ask them.