Understanding your biopsy report

Reading a Prostate Biopsy Report — Line by Line

A prostate biopsy report uses language written for pathologists and urologists. This page translates the key terms so you can follow the conversation at your next appointment.

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

Three key elements — Gleason score, Grade Group, and core findings are the parts your urologist will focus on first.
Two numbers, one score — The Gleason score adds two pattern numbers. The order of those numbers matters as much as the total.
Grade Group is now standard — Grade Group 1 to 5 has largely replaced older Gleason groupings in how results are discussed.
Numbers need context — The report is read alongside your PSA result and imaging. No single number decides the next step on its own.

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A prostate biopsy report has three key sections: the Gleason score, the Grade Group, and the core findings. The Gleason score adds two pattern numbers together. The Grade Group translates that into a scale of 1 to 5. Your urologist interprets all three together — the numbers alone do not give you the full picture.

What do the terms on a prostate biopsy report mean?

Cores: Small cylinders of prostate tissue removed during the biopsy. The pathologist examines each one separately under the microscope.
Positive cores: Cores that contain cancer cells. Your report states how many were positive out of the total number taken.
Gleason primary pattern: The cell growth pattern that appears most in the sample, assigned a number from 3 to 5. A 3 is the most orderly; a 5 is the most disorganised.
Gleason secondary pattern: The second most common pattern in the sample, also scored from 3 to 5. The primary number is always written first.
Gleason score: The primary pattern number added to the secondary pattern number. The possible range is 6 to 10.
Grade Group: A number from 1 to 5 derived from the Gleason score. It is the classification most urologists and oncologists now refer to first.
Perineural invasion (PNI): Cancer cells found alongside a nerve inside the prostate. The pathologist notes its presence; your urologist explains what it means for your situation.
Percentage core involvement: How much of each positive core contains cancer, reported as a percentage or a measurement in millimetres.

Which parts of the report should you look at first?

Total number of cores taken, and how many are positive
The two Gleason pattern numbers listed separately — primary first, then secondary
The Gleason score (the sum of those two numbers)
The Grade Group (a number from 1 to 5)
The anatomical locations of positive cores (left base, right apex, and so on)
Whether perineural invasion is mentioned
The percentage or length of cancer within each positive core

How do Grade Group and Gleason score relate to each other?

Grade Group	Gleason Score	What the pathologist observed
1	3+3 = 6	Only the most orderly cell pattern present in the sample
2	3+4 = 7	Orderly pattern predominates, with some less orderly cells also present
3	4+3 = 7	Less orderly pattern predominates, with some orderly cells also present
4	4+4 = 8, or 3+5, or 5+3	Predominantly less orderly cells, or a mix that includes the most disorganised pattern
5	9 or 10	The most disorganised cell pattern predominates throughout the sample

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What are the main sections of the report?

The top of the report contains administrative information: your name, the date, the number of cores submitted, and the name of the pathologist who examined them.

The main body lists findings core by core, organised by anatomical location — left base, left mid, left apex, right base, right mid, right apex. Each line states whether cancer was found and, if so, the Gleason pattern and how much of the core was involved.

A summary at the end gives the overall Gleason score, the Grade Group, and any additional findings such as perineural invasion.

The report is written for the urologist, not for you. Ask your team to go through it section by section at your appointment.

Which numbers matter most, and why?

The Grade Group is the number your urologist will refer to first. It runs from 1 to 5 and was introduced to give a clearer picture than the Gleason score total alone.

The Gleason score matters because the order of the two pattern numbers matters — not just the sum. A 3+4 and a 4+3 both total 7, but they describe different findings, which is why both numbers are always shown.

Core burden tells your urologist how much of the gland is involved: how many cores are positive, and how much cancer is present within each one.

Your urologist reads all of these alongside your PSA level and any imaging before making a recommendation. No single number on the report decides the next step.

What should you ask your urologist about the report?

What does my specific Gleason score mean for me?

The Gleason score is one input alongside your PSA level, core burden, and imaging results. Your urologist puts all of this together before making any recommendation. Before your appointment, write down your Gleason score and Grade Group so you can ask what they mean in the context of your full picture — not as numbers on their own.

Why does a Gleason score of 7 appear as two different Grade Groups?

A Gleason score of 7 is written as either 3+4 or 4+3, and the distinction matters. A 3+4 means the orderly pattern predominated — this is Grade Group 2. A 4+3 means the less orderly pattern predominated — this is Grade Group 3. They have the same total but different implications, which is exactly why both pattern numbers are shown separately on your report.

My report mentions perineural invasion. Should I be concerned?

Perineural invasion means the pathologist saw cancer cells alongside a nerve inside the prostate. It is recorded as a finding. What it means for your management depends on everything else in the report and is a question for your urologist at your next appointment. Do not draw conclusions from this term before that conversation.

Can I ask for a second pathology opinion?

Yes, and it is a reasonable thing to request, particularly when a significant treatment decision follows from the report. A second pathologist reviews the same slides and either confirms or refines the Gleason score and Grade Group. Ask your urologist or treating team how to arrange it. Second opinions on important diagnostic findings are standard practice, not a sign of distrust.

What other information will my urologist use alongside the report?

Your PSA level and how it has changed over time, any MRI findings, your age and general health, and results from any earlier biopsy if this is not the first. The biopsy report is one part of the picture. The recommendation your urologist makes comes from reading all of it together, often at a multidisciplinary meeting that includes oncologists, radiologists, and pathologists.

What happens next after the biopsy report?

Your urologist will discuss the findings at an appointment and, in many cases, will present your case to a multidisciplinary tumour board — a meeting of urologists, oncologists, radiologists, and pathologists who review all available information before a recommendation is agreed. You will then be told what the options are and, where more than one exists, what each involves.

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Common questions

Frequently asked questions

What does it mean if my Gleason score is 7?

A Gleason score of 7 is always written as 3+4 or 4+3, and the order matters. A 3+4 is Grade Group 2; a 4+3 is Grade Group 3. They are different findings that may lead to different conversations about next steps. Your report will show both numbers. Ask your urologist which pattern predominated and what that means alongside your PSA level and core findings.

Is it bad if several cores are positive?

Core burden — how many cores are positive and how much cancer is in each — is one of the factors your urologist considers. More positive cores or higher percentage involvement can suggest more extensive disease within the gland, but what it means for you depends on your Grade Group, PSA, and imaging. Your urologist reads it as part of the whole picture, not as a number on its own.

What does Grade Group 1 mean?

Grade Group 1 corresponds to a Gleason score of 3+3=6. The pathologist saw only the most orderly cell pattern in the sample. Your urologist will still assess this alongside your PSA level and core burden before recommending next steps. For some patients, Grade Group 1 findings lead to active surveillance rather than immediate treatment — but that decision belongs with your urologist, not the report alone.

Can I ask for a second opinion on my biopsy?

Yes. A second pathologist reviewing the same slides can confirm the Gleason score and Grade Group, or provide a refined reading. This is accepted practice when significant decisions follow. Ask your treating team to arrange it — the biopsy slides are kept by the laboratory and can be sent to another institution. It is a reasonable step, not an unusual request.

My report says 'no malignancy identified'. What does that mean?

It means the pathologist did not find cancer in the cores examined. This is a clear finding. It does not guarantee that cancer is absent from the entire prostate — a biopsy samples specific locations, not every part of the gland. Your urologist will tell you whether any follow-up is needed based on your PSA level and the original reason the biopsy was done.

What should I bring to my follow-up appointment?

Bring a copy of the biopsy report and write down your Grade Group and Gleason score beforehand so you can refer to them easily. Note the questions you want answered — which pattern predominated, what the core burden means in your case, and what the recommended next step is. A family member who can listen and take notes is useful, because these appointments carry a great deal of information.

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