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Prostate biopsy results

Gleason Score — What the Two Numbers Mean

The Gleason score on your biopsy report is made of two numbers, not one. Knowing what each number describes — and why their order matters — helps you ask better questions at your next appointment.

Medically reviewed by Dr. Bharati Devi Gorantla, Medical Oncologist, MBBS · MD · DM (Adyar, Chennai) · ECMO · MRCP SCE (UK) · Last reviewed September 2026

  • Two numbers, not one total — The score is written as two grades added together, such as 3+4. Reading only the total misses something important.
  • Each number grades a cell pattern — The pathologist identifies the two most common patterns of cell abnormality in your sample and grades each one.
  • The first number is dominant — 3+4 and 4+3 both add up to 7, but they describe different findings. The first number is the pattern seen most often.
  • Grade groups show the same information — A 1-to-5 grade group appears on most modern reports alongside the Gleason score. Both describe the same biopsy result.
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The Gleason score is made of two numbers, each between 3 and 5, grading how abnormal your prostate cancer cells look under a microscope. The pathologist adds them together to give the final score. The first number describes the most common pattern in the biopsy; the second describes the next most common.

What does each term on the report mean?

Primary grade
The pattern of cell abnormality seen most often in your biopsy. Graded 3, 4, or 5. This is the first number in the Gleason score.
Secondary grade
The second most common pattern in the biopsy. Also graded 3, 4, or 5. This is the second number.
Gleason score
The primary and secondary grades added together. Because grading now starts at 3, scores range from 6 to 10.
Grade group
A simpler 1-to-5 scale that maps onto the Gleason score. Included on most modern pathology reports alongside the Gleason score.
Pattern 3
Cells that look reasonably organised and close to normal prostate tissue under the microscope.
Pattern 4
Cells that look more disorganised and more abnormal than pattern 3.
Pattern 5
Cells that look markedly abnormal, with little resemblance to normal prostate tissue.

What should you check when you read your biopsy report?

  • Find the two numbers written separately — for example, 3+4 — not just the total
  • Check which number comes first: it is the dominant pattern in your sample
  • Look for the grade group — modern reports list it alongside the Gleason score
  • Note any mention of pattern 5 cells, even as a minor finding
  • Bring the full pathology report to your appointment, not just the number

Why are the two numbers added together?

A prostate biopsy takes multiple tissue cores from different parts of the gland, and cancer cells across those cores do not always look the same. The pathologist identifies the two most common patterns and grades each one separately.

Adding the grades together gives a single number that reflects the overall picture. A score of 7 tells you less than knowing whether it comes from 3+4 or 4+3, because those two combinations are not the same finding.

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How do Gleason scores and grade groups relate to each other?

Gleason combinationGleason scoreGrade groupDominant pattern in sample
3+361Pattern 3 cells — well organised
3+472Pattern 3 — less abnormal pattern dominates
4+373Pattern 4 — more abnormal pattern dominates
4+4, 3+5 or 5+384Substantially abnormal cells throughout
4+5, 5+4 or 5+59 or 105Markedly abnormal cells throughout

Why does the order of the two numbers matter?

3+4 and 4+3 are both called Gleason 7, but they are not the same finding. The first number is the dominant pattern — the one the pathologist saw most often in your sample.

In 3+4, the less abnormal pattern (3) dominates. In 4+3, the more abnormal pattern (4) does. Grade groups reflect this: 3+4 is grade group 2, while 4+3 is grade group 3. If you were given only the total, ask your urologist or oncologist to confirm both numbers.

More questions about how the score works

Why does my report not show Gleason 1 or Gleason 2?

Patterns 1 and 2 described nearly normal tissue and are no longer assigned in modern pathology. The scale now starts at pattern 3, making 6 the lowest possible Gleason score on a current report. If an older report of yours shows lower grades, ask your doctor whether it should be re-reviewed under current criteria.

My report mentions pattern 5 cells but my score is not 9 or 10. Why?

Pattern 5 cells can appear as a minor finding even when they are not the primary or secondary grade. Many pathologists note this separately on the report. Whether it changes how your case is managed depends on context your urologist or oncologist is best placed to assess — ask them directly about this finding.

My report lists different scores from different biopsy cores. Which one is mine?

The pathologist assigns an overall score across all cores, and that is what your treatment team works from. Individual core scores also carry information, but weighing them is your urologist's or oncologist's job. Ask them to explain both the overall score and what the pattern across cores tells them.

Can the Gleason score change after surgery?

Yes. The biopsy grades tissue from needle samples; surgery gives the pathologist the entire removed prostate to examine. Post-surgical pathology sometimes shows a different score — this is not an error in either result. Your surgeon will explain what any change means for monitoring and next steps.

Is the Gleason score the only grading information on my report?

Most reports today include both the Gleason score and the grade group, as recommended by the International Society of Urological Pathology. Reports may also note what percentage of cores were positive and how much of each core showed cancer — these describe extent, separate from how abnormal the cells looked.

Who decides what my score means for treatment?

Your urologist or oncologist does. The score is read alongside PSA level, imaging, the number of cores involved, your age, and your overall health. No single number determines what happens next. Ask your treating doctor to explain how each piece of information is being considered together.

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Common questions

Frequently asked questions

My report says 3+4=7. What does that mean?

Pattern 3 — the more organised type — was the most common pattern in your biopsy. Pattern 4 — more abnormal — was the second most common. Together they give a Gleason score of 7 and a grade group of 2. What this means for your care is a question for your urologist or oncologist, who reads it alongside your PSA level and imaging findings.

Is a higher Gleason score always worse?

A higher score reflects more abnormal-looking cells, and your oncologist will factor it in carefully. But it is one input among several — PSA, imaging, the number of cores involved, your age, and your health all shape the picture. Ask your treating doctor to explain how each factor is being weighed in your specific case.

Why does my report show both a Gleason score and a grade group?

They describe the same finding in two different ways. The Gleason score has been in use for decades; the grade group — a 1-to-5 scale — was introduced to make results easier to communicate. One thing the grade group makes clearer: a Gleason score of 6 is the lowest end of the current scale, not the middle.

Can the Gleason score change after surgery removes the prostate?

Yes, and this is not uncommon. The biopsy samples the gland with needles; surgery gives the pathologist the entire removed prostate to examine. The final score sometimes differs — neither result is wrong, just based on different amounts of tissue. Your surgeon will explain what any difference means for your follow-up.

My biopsy showed different scores from different cores. Which one is my Gleason score?

Your pathologist assigns an overall score across all cores, and that is what your treatment team uses. Individual core scores carry information too, but interpreting the pattern across cores is your urologist's or oncologist's job. Ask them to explain both the overall score and what the distribution tells them.

Is it reasonable to ask for a second opinion on my biopsy pathology?

Yes, and most treating doctors support it — particularly for borderline findings or where the result will significantly influence treatment. Ask your urologist to arrange for your biopsy slides to be reviewed at another centre. The review should be of the actual tissue slides, not just the written report, to be meaningful.

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