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How the Grade Is Determined — And Why It Sometimes Changes
Grade is one of the numbers that drives everything that happens next, and most women are given it without ever being told how it was arrived at. It comes from a pathologist looking at your tissue and judging how closely it still resembles normal uterine lining — principally by how much of the tumour is growing as solid sheets rather than forming recognisable glands. Understanding that process explains something that distresses a great many women: the grade on your biopsy can differ from the grade after surgery. That is not a mistake. It is the predictable consequence of judging a whole tumour from a small piece of it, and this page explains why.
- It is a judgement about appearance — how closely the tissue resembles normal lining
- Biopsy grade is provisional — a small sample, not the whole tumour
- A change after surgery is expected — not an error by anyone
- Some types are high grade by definition — regardless of what the architecture shows
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How a Pathologist Arrives at the Grade
The actual process, described plainly.
- The tissue is processed and stained. Your sample is preserved, embedded in wax, sliced extremely thinly and stained so that the structures become visible. This takes days rather than hours, which is why results are not available on the day.
- The architecture is assessed first. Normal endometrium forms glands — recognisable tubular structures. The central question in grading is how much of the tumour still does that, and how much has abandoned it and is growing as solid sheets of cells.
- More solid growth means a higher grade. A tumour that still forms glands throughout is low grade. One in which solid sheets dominate is high grade. The traditional FIGO system defines thresholds for grades 1, 2 and 3 on this basis.
- Then the nuclei are assessed. If the cell nuclei look markedly abnormal across most of the tumour, the grade is increased beyond what the architecture alone would give. This is why two tumours with similar gland formation can be graded differently.
- Some types bypass all of this. Serous carcinoma, clear cell carcinoma and carcinosarcoma are treated as high grade by definition, whatever their architecture, because they behave aggressively regardless. See carcinosarcoma.
What the grade does not tell you is how far the cancer has spread — that is stage, a separate question answered by imaging and by examining the removed uterus and lymph nodes. Grade and stage are frequently confused. See FIGO staging.
Did You Know? A pre-operative biopsy samples a small part of the uterine lining. A hysterectomy specimen contains the entire tumour. Tumours are frequently not uniform — one area may be well organised and glandular while another, that the biopsy never reached, is solid and disorganised. The pathologist grades what is in front of them, accurately, in both cases. So when the final report reads grade 2 and the biopsy read grade 1, nobody has been careless and nothing has grown in the interval; more of the tumour has simply become visible. This is well documented, it is expected, and it is one reason the definitive treatment decision waits for the final pathology rather than being fixed at biopsy. Sources: WHO Classification of Tumours — Female Genital Tumours; FIGO 2023 staging system for endometrial cancer; ESGO–ESTRO–ESP guidelines for the management of patients with endometrial carcinoma.
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What the Wording on Your Report Means
Two grading systems are currently in use, so reports differ. Both are legitimate.
| What your report says | What it means |
|---|---|
| Grade 1 / well differentiated | The tumour still closely resembles normal endometrial glands. The least aggressive category, frequently confined to the uterus, and the group in which fertility-sparing treatment may occasionally be considered. See fertility-sparing eligibility. |
| Grade 2 / moderately differentiated | An intermediate appearance, with a mixture of gland formation and solid growth. Treatment decisions here lean heavily on the other factors — depth of invasion, stage and molecular class. |
| Grade 3 / poorly differentiated | Predominantly solid growth with little gland formation. Carries a higher risk of deep invasion and of spread, and generally prompts more intensive treatment. This is also the group where a POLE result can change matters substantially. See molecular classification. |
| Low grade / high grade | The FIGO 2023 binary system, increasingly used. Low grade corresponds broadly to the old grades 1 and 2; high grade to grade 3 and to the aggressive histological types. If your report uses this wording, it is current practice rather than a less detailed assessment. |
| Serous, clear cell or carcinosarcoma | A histological type rather than a grade, and each is regarded as high grade by definition. The type matters more than any grading number here. See clear cell carcinoma. |
| “Cannot be graded on this sample” | An honest statement that the tissue available is insufficient or unsuitable for a reliable judgement. It means the question is deferred to the final specimen, not that anything has gone wrong. |
Grade alone should not be read as a prognosis. It is one input among four that matter — grade, histological type, stage and molecular class. A grade 3 tumour caught early, completely removed and found to be POLE-mutated is a very different situation from the same grade in advanced disease.
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A Changed Grade Is Not a Mistake
A biopsy shows part of the tumour. Surgery shows all of it. More becoming visible is expected.
Why the Grade Can Change
Five reasons, none of which involves anyone having made an error.
The biopsy saw only part of the tumour
The commonest reason by far. Tumours are frequently not uniform — one area glandular and well organised, another solid and disorganised. A biopsy that happened to sample the first area returns grade 1, entirely accurately. The hysterectomy specimen contains the whole tumour, including the area the biopsy never reached. Both reports are correct.
Grading involves judgement
It is not a measurement. Two experienced pathologists can look at the same slide and assign different grades, particularly at the boundary between grade 1 and grade 2. This is documented and understood, and it is why slide review by a second pathologist is a recognised step rather than an accusation.
The type may be revised too
Occasionally a tumour called endometrioid on a small biopsy is found to be serous or clear cell on the full specimen, or to contain a mixture. This changes more than the grade and is one of the reasons the treatment plan is finalised after surgery rather than before it.
Molecular results may reframe it
A grade 3 tumour found to be POLE-mutated behaves far better than its grade suggests, and may require less treatment rather than more. A low-grade tumour with abnormal p53 may need more. Molecular class can override the impression grade gives, in either direction.
It is why the plan waits for final pathology
The decision about treatment after surgery is deliberately made on the complete specimen, typically two to three weeks afterwards. That wait is frustrating and it exists precisely so that the decision rests on the whole tumour rather than on a sample of it. See treatment after surgery.
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When a Pathology Second Opinion Is Worth Having
Asking for slides to be reviewed is ordinary practice, not a complaint about anyone.
- When the grade sits at a boundary. The distinction between grade 1 and grade 2, or between low and high grade, is where reviewers most often differ — and it is also where the treatment consequences diverge.
- When the diagnosis is an uncommon type. Serous carcinoma, clear cell carcinoma, carcinosarcoma and sarcomas are seen less frequently, and review by a pathologist who sees gynaecological cases regularly adds real value. See leiomyosarcoma.
- When a major decision turns on it. Where the difference between two grades is the difference between having chemotherapy and not having it, confirming the grade before starting is entirely reasonable.
- When fertility-sparing treatment is being considered. That option depends on the tumour genuinely being grade 1 and confined to the lining, so the grade is load-bearing in a way it is not elsewhere. See fertility-sparing eligibility.
- When molecular testing has not been done. A review is a natural opportunity to complete it, and it can be performed on the same stored tissue block. See MMR and MSI testing.
Slides and blocks belong to you in the sense that you are entitled to request them for a second opinion. Most laboratories release them on request and the process is routine. See second opinion.
Why Slide Review Matters Here
Grade is a judgement made by a person looking down a microscope. Judgements benefit from a second reader.
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Grade Is Not Stage
Grade describes how the cells look. Stage describes how far it has spread. They are frequently confused.
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Common questions
How Grade Is Determined — Frequently Asked Questions
How does a pathologist decide the grade?
Principally by looking at architecture — how much of the tumour still forms recognisable glands, as normal endometrium does, and how much has abandoned that pattern and grows as solid sheets of cells. More solid growth means a higher grade. The pathologist then assesses the cell nuclei: where these look markedly abnormal across most of the tumour, the grade is increased beyond what the architecture alone would give. Some histological types bypass this entirely — serous carcinoma, clear cell carcinoma and carcinosarcoma are considered high grade by definition because they behave aggressively regardless of how the tissue is arranged.
Why did my grade change between the biopsy and after surgery?
Because the two samples are not the same thing, and this is expected rather than an error. A biopsy takes a small piece of the lining; the hysterectomy specimen contains the entire tumour. Tumours are frequently not uniform — one area may be well organised and glandular while another is solid and disorganised. A biopsy that sampled the first area returns a lower grade, accurately. When the whole tumour is examined, areas the biopsy never reached become visible. Nothing has grown in the interval and nobody has been careless. It is one of the reasons the decision about treatment after surgery deliberately waits for the final pathology.
My report says low grade rather than grade 1 or 2. Is that less detailed?
No — it reflects the FIGO 2023 system, which distinguishes low-grade from high-grade endometrial cancer rather than using three tiers. Low grade corresponds broadly to the older grades 1 and 2; high grade to grade 3 and to the aggressive histological types such as serous and clear cell carcinoma. Both systems are currently in use and reports vary accordingly, so seeing either is normal. If you want to know where your tumour would have sat on the older scale, that is a reasonable question to ask, and the underlying description of the tissue will usually make it clear.
Does a high grade mean a poor outcome?
Not on its own, and grade should never be read as a prognosis in isolation. It is one of four things that matter together: grade, histological type, stage, and molecular class. A grade 3 tumour found early, completely removed, and shown to be POLE-mutated has an excellent outlook — that molecular group behaves far better than its appearance suggests, and appropriately selected women may need less treatment rather than more. Conversely a low-grade tumour with abnormal p53 may warrant intensification. What determines your situation is the combination, weighed by a team, not any single number.
Can I ask for my slides to be reviewed by another pathologist?
Yes, and it is ordinary practice rather than a complaint about anyone. Grading involves judgement — two experienced pathologists can assign different grades to the same slide, particularly at the boundary between grades — so a second read has genuine value where a major decision turns on it. It is most worth doing when the grade sits at a boundary, when the diagnosis is an uncommon type, when the difference between grades would change whether you have chemotherapy, or when fertility-sparing treatment is being considered. Most laboratories release slides and blocks on request and the process is routine.
Medical disclaimer: This page provides general information about how endometrial cancer grade is determined, reviewed by a CION oncologist. It is not a substitute for individual medical advice. Grade is one factor among several — including histological type, stage and molecular classification — that determine treatment and outlook, and should be interpreted by your treating team in the context of your complete pathology.