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CION Cancer Clinics
Follicular lymphoma grades 1, 2, 3A and 3B, explained | CION Cancer Clinics
The grade of follicular lymphoma describes how many large, fast-dividing cells the pathologist counted in your lymph node sample. Grades 1 and 2 are low grade and usually grow slowly. Grade 3A sits in between, and grade 3B is usually treated as a faster-growing lymphoma. The grade is not the stage, and on its own it does not decide when treatment starts. At CION Cancer Clinics, our haematology team plans myeloma and lymphoma care with you, discussed at a tumour board and explained in plain words.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- What does grade 1, 2 or 3 mean in follicular lymphoma?
- How is the grade actually worked out?
- How do the grades differ in practice?
- What do the words on the biopsy report mean?
- What do families often get wrong about the grade?
- What can the grade not tell you?
- Common questions about follicular lymphoma grades
The short answer
What does grade 1, 2 or 3 mean in follicular lymphoma?
The grade tells you how many large, fast-dividing cells the pathologist saw in your lymph node sample. Grades 1 and 2 have few of them and behave as a slow-growing lymphoma. Grade 3 has more, and grade 3B is usually treated like a faster-growing lymphoma.
Where the grade comes from
Follicular lymphoma grows in round clusters inside the lymph node, called follicles. Most of the cells in those clusters are small. A few are large cells called centroblasts. The pathologist counts the large cells in several fields under the microscope and averages them. More large cells means a higher grade.
Why grades 1 and 2 are now read together
The line between grade 1 and grade 2 was always hard to draw, and the two behave the same way. Current classifications from the World Health Organization group them as low grade, and some reports no longer split them at all. If your report says "grade 1-2", nothing is missing. It is the modern way of writing it.
Why grade 3 is split into 3A and 3B
Grade 3A still has some small cells mixed in. Grade 3B is made up of sheets of large cells only. Many haematologists treat 3A much like low grade disease, although practice varies. Grade 3B is usually planned for as a faster-growing lymphoma, and newer reports may call it follicular large B-cell lymphoma instead.
The grade is one part of the picture. It is read with the stage, your symptoms and your blood tests before any plan is made.In the laboratory
How is the grade actually worked out?
A good sample
A whole lymph node, or a large core of one, gives the clearest answer. A thin needle sample may show lymphoma but not enough of the pattern to grade it with confidence.
Looking at the pattern
The pathologist first checks that the cells grow in follicles. Areas where the follicles have melted into flat sheets are noted separately, because they can change the plan.
Counting large cells
The large cells are counted across several fields at high magnification and averaged. This count gives grade 1-2, 3A or 3B.
Special stains
Stains such as CD10, BCL2 and Ki-67 confirm the type and show how many cells are dividing. They support the grade rather than replace it.
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How do the grades differ in practice?
These are general patterns. Your own plan depends on much more than the grade alone.
Grade 1-2 (low grade)
Slow-growing. Many people have no symptoms and are watched closely without treatment for a long time. Treatment starts when the lymphoma causes trouble, not simply because it is there.
Often means
- Watch and wait may be offered
- Regular check-ups and blood tests
Grade 3A
A middle ground. Some teams treat it like low grade disease and some plan more actively. Ask your haematologist which way they lean for you, and why.
Scans and symptoms usually settle the choice.Grade 3B
Behaves more like diffuse large B-cell lymphoma, a faster-growing type. Watch and wait is not usually offered. Treatment is planned along the lines used for that lymphoma.
Mixed or unclear
Some samples show low grade areas beside sheets of large cells. The report may mention a "diffuse area". Teams usually plan around the faster-growing part, so do not ignore that line.
On your report
What do the words on the biopsy report mean?
- Follicular pattern
- The cells are growing in round clusters, which is what gives this lymphoma its name.
- Diffuse area
- A part of the node where the clusters have been lost and cells lie in flat sheets. It may point to faster growth.
- Centroblasts
- The large cells that are counted to decide the grade.
- Ki-67
- A stain showing what share of cells are dividing. A higher figure suggests faster growth, but it does not set the grade on its own.
- Transformation
- When a slow-growing lymphoma changes into a faster-growing one. It is a separate event from having grade 3B at diagnosis.
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Commonly believed
What do families often get wrong about the grade?
"Grade 3 means stage 3, so it has spread."
Grade and stage are different things. The grade is about how the cells look under the microscope. The stage is about how many parts of the body are involved, found on scans. You can have low grade disease at a high stage, or the other way round.
"Low grade means we can ignore it."
Low grade means slow, not harmless. It still needs a haematologist, regular follow-up and a clear list of symptoms to report. Missing check-ups is how a change gets found late.
"A higher grade is always worse news."
A faster-growing lymphoma often responds well to treatment because it is dividing quickly. The grade shapes the plan. It does not tell you on its own how things will go for you.
"The grade on the first report is fixed for life."
The lymphoma can change over time. If it starts to behave differently, a new biopsy may be advised, and the new report guides what happens next.
Did you know
Grading follicular lymphoma is one of the harder calls in pathology. If your report is unclear or the sample was small, asking for a review of the same slides by a haematopathologist, a pathologist who focuses on blood cancers, is a reasonable request.
Being straight with you
What can the grade not tell you?
The grade cannot tell you whether you need treatment now. That depends on symptoms, the size of the nodes, blood counts and whether any organ is under pressure. Many people with grade 1-2 disease never need treatment for years.
It cannot tell you how long anything will take
No single line on a report gives an outlook. Your haematologist reads the grade alongside the stage, a risk score, your age and general health. Ask them to explain what these mean for you, rather than reading numbers online that were written about other people.
What to bring to the appointment
Bring the full biopsy report, the scan reports and your latest blood tests. If you had the biopsy elsewhere, ask that hospital for the slides and paraffin blocks. At CION, the haematology team reviews these and discusses the case at a tumour board before a plan is set.
This page explains the words. It cannot read your report for you.Questions we are asked
Common questions about follicular lymphoma grades
Is grade 1-2 follicular lymphoma serious?
It is a cancer and needs proper care, but it usually grows slowly. Many people live with it for a long time, with periods of treatment and periods of simply being watched. Your haematologist will explain what it means for you after looking at your scans, blood tests and symptoms together.
What is the difference between grade 3A and 3B?
Grade 3A still has some small cells mixed with the large ones. Grade 3B is made only of large cells growing in sheets. That is why 3B is usually treated like a faster-growing lymphoma, while 3A is handled differently from centre to centre. Ask which approach your team is taking.
Can the grade change later?
Yes. A slow-growing lymphoma can change into a faster-growing one over time, which is called transformation. Signs can include a node growing quickly, new fevers or night sweats. If this happens, a new biopsy is usually advised so the plan is based on what the lymphoma is doing now.
My report does not mention a grade. Is that a mistake?
Not always. A small needle sample may not show enough tissue to grade, and some newer reports describe the pattern instead of giving a number. Ask your haematologist whether a larger biopsy or a review of the slides would help. It is a normal question to ask.
Does grade 3 mean I need chemotherapy straight away?
Grade 3B usually means treatment is planned soon. For grade 3A, the decision depends more on your scans, symptoms and blood counts. Your team will explain the reason for the timing. Do not delay a planned start because you read that some grades can be watched.
Should I get a second opinion on the grade?
It is reasonable, especially if the sample was small or the report is unclear. The useful second opinion is a review of the actual slides and blocks, not only the typed report. Collect them from the laboratory, keep them safe and bring them with you.
Is follicular lymphoma the same as leukaemia?
No. Both are blood cancers, but follicular lymphoma mostly grows in lymph nodes, while leukaemia starts mainly in the bone marrow and blood. Follicular lymphoma can reach the bone marrow, and your report or a marrow test may mention this. It is still follicular lymphoma.
Will treatment be covered by Aarogyasri or insurance?
Lymphoma treatment is often covered under Aarogyasri, PM-JAY, CGHS, ECHS, EHS and many cashless insurance plans, though what is covered depends on the scheme and the treatment chosen. Scheme rules change, so check the current rules. The helpline can check your own cover before you travel.
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Sources
- Cancer Research UK — Follicular lymphoma
- National Cancer Institute — Adult Non-Hodgkin Lymphoma Treatment (PDQ) - Patient Version
- American Cancer Society — Non-Hodgkin Lymphoma
- Leukemia & Lymphoma Society — Non-Hodgkin Lymphoma
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.
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