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Reading your biopsy report

Gleason 3+4 and 4+3: — The Same Number, Different Disease

Both scores add to 7. But 3+4 and 4+3 are not the same diagnosis. The order of the numbers tells your urologist which cell type is in the majority — and that changes how seriously each is treated.

Medically reviewed by Dr. C. Raghavendra Reddy, Medical Oncologist, MBBS (Gold Medal) · DNB · DM (Medical Oncology, Gold Medal) · Last reviewed September 2026

  • Order is not arithmetic — The two numbers do not simply add up. The first number carries more weight because it is the dominant pattern.
  • Grade 4 cells are more aggressive — When 4 comes first, the faster-growing pattern is in the majority across your biopsy sample.
  • They have different Grade Groups — 3+4 is Grade Group 2. 4+3 is Grade Group 3. These are separate categories, not variations of the same one.
  • Treatment conversations differ — Your urologist weighs the order alongside PSA, imaging, and other factors before recommending next steps.
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Both scores add up to 7, but they describe different diseases. The first number is the dominant pattern — the cell type that makes up most of your tumour. When 4 comes first, a more disorganised cell pattern is in the majority. Your urologist uses the order, not just the total, to guide next steps.

What do the terms in your biopsy report actually mean?

Primary grade
The first number in the Gleason score. It represents the cell pattern that makes up the largest share of your biopsy sample.
Secondary grade
The second number. It represents the second most common pattern seen across your cores.
Grade 3 cells
Cells that still form recognisable glands. They grow more slowly and tend to remain within the prostate for longer.
Grade 4 cells
Cells with poorly formed or fused glands. They grow more quickly and are more likely to extend beyond the prostate.
Gleason 3+4 (Grade Group 2)
Most of the tumour is grade 3, with a smaller proportion of grade 4. The slower-growing pattern is the dominant one.
Gleason 4+3 (Grade Group 3)
Most of the tumour is grade 4, with a smaller proportion of grade 3. The faster-growing pattern is the dominant one.
Grade Group
A 1–5 system introduced to make Gleason scores clearer across hospitals. Grade Group 2 (3+4) and Grade Group 3 (4+3) are separate levels, even though both have a Gleason total of 7.

Why does it matter which number comes first?

The first number tells you what the majority of the cancer looks like. The pathologist assigns a grade to the two most common cell patterns seen under the microscope. The first number is the one seen most.

When 3 comes first, grade 3 cells — the more organised, slower-growing type — make up most of the tumour. When 4 comes first, grade 4 cells are the majority, and grade 4 tissue grows more quickly and is more likely to spread.

A score of 3+4 and a score of 4+3 are the same arithmetic sum. They are not the same disease. The International Society of Urological Pathology and major bodies including NCCN and ESMO treat them as separate categories.

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Does the order change what your doctor recommends?

It can. The distinction between 3+4 and 4+3 is one of the factors your urologist weighs when deciding whether to monitor, treat, or investigate further.

For some patients with 3+4 disease, active surveillance — careful monitoring without immediate treatment — is a conversation worth having with your team. That conversation is less commonly appropriate for 4+3 disease, because the dominant pattern is the more aggressive one.

Your team will look at the score alongside how many biopsy cores are involved, your PSA level, what imaging shows, and your age and overall health. Ask your urologist to walk you through what your specific report means and what options exist.

Did you know?

The Grade Group system was created specifically because Gleason 3+4 and 4+3 were being grouped together as 'Gleason 7' — obscuring a clinically meaningful difference.

The ISUP 2014 consensus conference revised the grading system after evidence showed the two behave differently in a proportion of patients.

Source: ISUP 2014 Consensus Conference on Gleason Grading of Prostatic Carcinoma

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Common questions

Frequently asked questions

They told me my Gleason score is 7. Is that good or bad?

A Gleason score of 7 can mean two different things depending on the order of the numbers, and that is the question to ask your urologist directly. Gleason 3+4 (Grade Group 2) and Gleason 4+3 (Grade Group 3) are both Gleason 7 but are treated as separate categories because the dominant cell pattern differs. What matters is how your urologist interprets it alongside your PSA level, the number of cores involved, and your imaging. Ask your team to confirm both numbers, not just the total.

What is a Grade Group and why does my report show both?

Grade Groups are a 1–5 system introduced to make Gleason scores clearer and more consistent across hospitals. Your report shows both because the Gleason score is the older established measure and the Grade Group is the newer international standard — and they do not map identically. Grade Group 2 corresponds to Gleason 3+4 and Grade Group 3 to Gleason 4+3. If your report shows only one format, ask your team to confirm the other.

My report mentions 3+4 in some cores and 4+3 in others. What does that mean?

It means the pathologist found different patterns in different parts of the prostate. A biopsy takes multiple small samples from different locations, and the grade can vary between them. When cores differ, the overall score on the front page of your report is typically the highest-grade combination seen. Your urologist will review the entire picture — not just the summary score — when planning your care. Bring the full pathology report to your appointment.

Can the Gleason score change between biopsy and surgery?

Yes, and this is not unusual. The biopsy samples a small number of tissue cores, while surgery removes the entire prostate, giving the pathologist far more tissue to examine. Some patients graded as 3+4 on biopsy are found to have 4+3 or higher disease when the full specimen is reviewed — a process called upgrading. The reverse, called downgrading, also occurs but less commonly. Your team will factor this possibility into the conversation about next steps.

Does a higher Gleason score always mean I need immediate treatment?

Not always. The score is one input among several. For some patients, particularly those with localised disease and lower-risk features on blood tests and imaging, monitoring rather than immediate treatment is an option worth discussing. For others, the combination of score, PSA, and extent of disease points toward earlier intervention. The decision belongs to you and your urologist together, based on your full picture. Ask your team to explain what they are weighing and what options apply to your situation.

Should I get a second opinion on my biopsy pathology?

A second pathology opinion is reasonable, and many oncologists encourage it for Gleason 7 disease precisely because the 3+4 versus 4+3 distinction carries real consequences and interpretation can vary between pathologists. Major cancer centres offer expert pathology review. Ask your urologist whether it is worth arranging before any treatment decision is made. The request goes to a pathology department — the question is whether another expert reads the same tissue slides the same way.

Full index

Browse all 701 biopsy topics

Every page in this section, grouped by the part of the journey it belongs to. Pick a group to see what is in it.

What Is a Biopsy?

What Is a Biopsy? Everything You Need to Know →

Types of Biopsy Compared

Which Biopsy Will You Have? Techniques Compared →

Preparing for a Biopsy

What to Expect on the Day of Your Biopsy →

Recovery and Aftercare

After a Biopsy: Recovery, Aftercare and Warning Signs →

Biopsy by Body Part

Biopsy by Body Part: What to Expect at Each Site →

Understanding Your Report

How to Read a Biopsy Report: Terms Explained →

IHC and Molecular Markers

IHC and Molecular Markers on a Biopsy: What They Mean →

Grading and Scoring Systems

Cytology & Prostate Scoring Systems Explained →

How Accurate Is a Biopsy?

How Accurate Is a Biopsy? Errors and Second Opinions →

If Your Result Is Benign

Your Biopsy Is Benign: What It Means and What Comes Next →

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