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Understanding your pathology report

Cancer Grade Explained: — What Grade 1, 2 and 3 Mean

A grade number on your pathology report describes how abnormal your cancer cells look under a microscope. Many people read it as a survival score. It is not. Grade is one piece of clinical information your oncologist uses alongside stage, test results and cancer type.

Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed September 2026

  • Grade is about cell appearance — It describes how abnormal cancer cells look under a microscope, not how far the cancer has spread.
  • Decided by a pathologist — A trained specialist examines your tumour tissue from your biopsy or surgery and assigns the grade.
  • Grade is not stage — Stage measures spread. Grade measures cell appearance. They are separate numbers that answer different questions.
  • Grading systems differ by cancer type — Breast, prostate and bowel cancers each use different systems, so a Grade 2 in one is not the same as a Grade 2 in another.
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Cancer grade describes how abnormal cancer cells look under a microscope, scored by a pathologist from your biopsy or surgery tissue. Grade 1 cells look close to normal; Grade 3 cells look very abnormal. Grade is not a survival score and not the same as stage, which measures how far the cancer has spread.

What does a cancer grade actually measure?

Grade measures how much your cancer cells have changed from the normal cells they came from. The more abnormal they look, the higher the grade.

A pathologist examines your tumour tissue under a microscope after your biopsy or surgery. They look at two things: how closely the cells still resemble their normal counterparts — a property called differentiation — and how actively the cells appear to be dividing.

What do the grade numbers mean?

Grade 1 — well differentiated
Cells look similar to normal cells from the same tissue. They tend to divide slowly. Grade 1 tumours generally grow more slowly than higher-grade tumours.
Grade 2 — moderately differentiated
Cells look noticeably abnormal but still share some features with normal cells. Grade 2 sits between Grade 1 and Grade 3.
Grade 3 — poorly differentiated
Cells look very abnormal and bear little resemblance to normal cells. They tend to divide more rapidly than lower-grade tumours.
Grade 4 — undifferentiated
Cells look so abnormal that their tissue of origin cannot be identified. Not all grading systems include Grade 4.
Differentiation
How closely cancer cells resemble the normal cells they came from. Well differentiated is closer to normal; poorly differentiated has moved far from it.
Mitotic index
A count of how many cells in the tissue sample appear to be actively dividing. One feature a pathologist uses when assigning a grade.

Is grade the same as stage?

No. Grade and stage are two separate measurements that answer different questions.

Stage describes where the cancer is — whether it is confined to its original location, has spread to nearby lymph nodes, or reached other parts of the body. Stage comes from scans and physical examination.

Grade describes what the cells look like under a microscope. A cancer can be low grade and advanced stage, or high grade and early stage. Your oncologist uses both when planning treatment.

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My pathology report has arrived — what should I do?

  • Write down the grade number and the name of the grading system used — they differ between cancer types.
  • Ask your oncologist what the grade means specifically for your cancer type, not in general.
  • Check whether differentiation or mitotic index is listed separately — these are the components behind the grade.
  • Ask how the grade fits alongside your stage and the other results your team has.
  • Keep a copy of your pathology report — other doctors will ask to see it.

How is grade decided — and what else should I know?

Why do different cancers have different grading systems?

Grading was developed separately for each major cancer type because the features that matter differ between tissues. Breast cancer uses the Nottingham grading system, prostate cancer uses the Gleason score, and bowel cancer uses its own Grade 1–3 criteria. A Grade 2 in one cancer type is not directly comparable to a Grade 2 in another. When reading information online, check that the grading system described matches your cancer type before drawing any conclusions.

Does a higher grade always mean more aggressive treatment?

Grade is one factor among several — it does not determine treatment on its own. Stage, cancer type, specific markers found in your tumour and your general health all contribute to the plan. Two people with the same grade can have very different treatment recommendations depending on everything else. Ask your oncologist to explain how each factor was weighed when arriving at your specific plan.

Can grade change over time?

The grade on your original report does not change — it describes tissue examined at a specific point in time. If a second biopsy is taken later, because the cancer returned or progressed, the new sample may receive a different grade. Tumours can evolve. This is one reason a repeat biopsy may be requested rather than relying on results from years earlier.

Did you know?

To assign a grade, pathologists examine thousands of cells in a tissue sample. For some cancers, they count how many cells in a defined microscopic area appear to be actively dividing — the mitotic index — which forms part of the grade calculation.

These criteria are published by international bodies including WHO and updated as evidence changes.

Source: WHO Classification of Tumours series

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Common questions

Frequently asked questions

What is the difference between grade and stage?

Grade and stage measure different things. Grade describes how abnormal your cancer cells look under a microscope. Stage describes where the cancer is — whether it is in one place or has spread to lymph nodes or other parts of the body. They are assigned from different information: grade from the pathology report, stage from scans and examination. Your oncologist uses both when planning treatment.

Does a higher grade mean I have less time?

Grade is not a time prediction — it describes a characteristic of your tumour cells. What happens next depends on many things: the cancer type, the stage, treatments available, and your individual response. Grade alone cannot predict an outcome. If the number is frightening you, say so to your oncologist. That conversation is more useful than reading grade against any general statement.

Can two pathologists give the same tumour a different grade?

A small degree of variation is possible, particularly for tumours that sit between two grades. Grading requires expert judgement in applying published criteria, and experienced pathologists can occasionally reach different conclusions on the same sample. For most tumours, agreement is high. If you feel uncertain, a second pathology opinion on the same tissue block is a reasonable request — your oncologist can advise whether it is likely to change anything in your case.

My report says 'moderately differentiated' — what grade is that?

'Moderately differentiated' means Grade 2. Well differentiated is Grade 1, moderately differentiated is Grade 2, and poorly differentiated is Grade 3. Some reports use the words, some use the numbers, and some use both — they mean the same thing. If your report uses a different system, such as the Gleason score for prostate cancer, the terminology works differently and your oncologist can explain what your specific result means.

Do all cancers get graded?

Most solid tumours are graded, but not all cancers use the same system. Prostate cancer uses the Gleason score rather than a simple 1–3 grade. Blood cancers such as leukaemia are classified differently, focusing on cell type and genetic markers rather than traditional pathology grading. If your report does not mention a grade, ask your oncologist whether grading applies to your cancer type and what classification was used instead.

Why does my report list the mitotic index separately?

Mitotic index is one of the components used to calculate the grade, and some reporting systems list it alongside the overall result. It counts how many cells in a defined area appear to be actively dividing. Seeing it separately does not mean anything different from what the grade already communicates — it is the detail behind the number. Ask your oncologist how it was weighed alongside the other features examined.

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