Understanding Your Gleason Score and PSA: A Surgeon's Plain-Language Guide

When the pathologist called me, he hated having to say it. Pathologists almost never talk to patients directly, and I could hear the discomfort in his voice. He told me I had a Gleason 9. I am a General Surgeon with more than 35 years at the operating table, and in that moment I had only a vague idea of what a Gleason 9 actually meant for me. So I did what I tell every patient to do. I sat down at my desk and started to learn. If two numbers on a page can decide the next two years of your life, you owe it to yourself to understand them.

This article will not diagnose you and it will not replace your urologist. It will do something just as important. It will let you walk into that appointment already understanding the language, so you can ask better questions and help make the decisions that are yours to make.

What a PSA Number Actually Tells You

PSA stands for Prostate Specific Antigen. It is a protein your prostate makes, and it shows up in a simple blood test. Both normal prostate cells and cancer cells produce it, which is the first thing most men misunderstand. A high PSA does not mean cancer. It means your prostate is asking for attention.

What counts as normal climbs with age. As a rough guide, the upper end of normal runs around:

• 2.5 for men in their 40s
• 3.5 for men in their 50s
• 4.5 for men in their 60s
• 6.5 for men in their 70s

Plenty of harmless things push PSA up: an enlarged prostate (BPH), a urinary infection, a recent bike ride, even ejaculation or a digital rectal exam shortly before the test. Some men simply run high as their personal normal. That is exactly why a single number out of context is the wrong thing to panic over.

Why PSA Velocity Matters More Than One Reading

Here is the part most men never hear: the trend often matters more than the value. If your PSA doubles over a few months, that rate of change, called PSA velocity, can be more telling than the absolute number.

A stable PSA of 5 is a different conversation than a PSA that jumped from 4 to 5 in six months.

My own number had been steady for years inside the normal range for my age. Then, at 67, it moved from around 4 to above 5 in less than six months. Neither my primary care doctor nor I were alarmed, because we both knew how many benign reasons exist for a rise. But that movement, on a previously flat line, got our attention. That is the lesson: one reading is a snapshot, a series of readings is a story.

How the Diagnosis Actually Gets Made

An elevated or fast-rising PSA usually leads to imaging, often a dedicated MRI of the prostate. The radiologist scores how suspicious any abnormality looks using the PI-RADS scale, from 1 (very low chance of cancer) to 5 (very high chance). Most PI-RADS 4 and 5 findings lead to a biopsy. Mine was read as a PI-RADS 4.

But imaging only raises suspicion. The definitive answer always comes from tissue. A prostate biopsy takes a series of small core samples, usually at least 12, and a pathologist examines each one under the microscope. That is where the Gleason score is born.

The Gleason Score, Decoded

Donald Gleason was a pathologist who, in 1974, built a system to grade prostate cancer by how abnormal the cells look. It has been the standard for 50 years. Cells are graded 1 to 5, where 1 looks nearly normal and 5 looks wildly distorted. The pathologist finds the two most common cell patterns in your samples and adds them together. The most common pattern is listed first.

That is why you see scores written as two numbers and a sum:

• Gleason 6 (3+3) - the lowest reported, minimally aggressive, often a candidate for active surveillance
• Gleason 7 (3+4) - malignant but generally less aggressive
• Gleason 7 (4+3) - more concerning, because the higher-grade pattern dominates
• Gleason 8, 9, and 10 - the most aggressive, more likely to spread and to recur

Notice that 7 (3+4) and 7 (4+3) carry the same sum but tell different stories. The order is not a formality. It is the heart of the message.

Some reports now also use the Grade Group system (1 through 5), developed by pathologist Jonathan Epstein to make all of this less confusing for patients. Grade Group 1 is Gleason 6; Grade Group 5 covers Gleason 9 and 10.

The Most Important Thing I Can Tell You

When I read what a Gleason 9 meant, the words echoed in me: increased mortality. I will not pretend that was easy to absorb. But here is the truth I came to, and the truth I want you to hold onto:

Prostate cancer, even when it is serious, is most often a slow-growing disease that can be controlled by many means for a long time.

The time between diagnosis and treatment, which feels unbearable as a patient, is rarely dangerous in prostate cancer. I waited three months for surgery because of a Covid delay, and as both a patient and a physician, I can tell you the wait was uncomfortable in the extreme but not harmful to my outcome. Panic is the enemy. Understanding is the antidote.

How to Use Your Numbers

When you sit down with your doctors, let your Gleason score and PSA history work for you, not against you:

• Ask which Gleason pattern is dominant, not just the sum. The order changes the meaning.
• Bring your PSA history, not just the latest value, so velocity is part of the conversation.
• Ask whether your situation fits active surveillance or calls for treatment, and why.
• Get a second and even third opinion across specialties. There are three frontline modalities for prostate cancer, and the right one is a decision you should help make.

I am living proof that a frightening number is not a verdict. It is information. And in the fight ahead, information is the best weapon you have. For more on this, see Dr. Black's book on cutting through prostate cancer confusion and his article on cancer treatment decisions.

References

• Gleason DF, Mellinger GT. Prediction of prognosis for prostatic adenocarcinoma by combined histological grading and clinical staging. J Urol. 1974;111(1):58-64.
• Epstein JI, et al. A Contemporary Prostate Cancer Grading System: A Validated Alternative to the Gleason Score. Eur Urol. 2016;69(3):428-435.
• Turkbey B, et al. Prostate Imaging Reporting and Data System Version 2.1 (PI-RADS v2.1). Eur Urol. 2019;76(3):340-351.
• Carter HB, et al. Early Detection of Prostate Cancer: AUA Guideline. J Urol. 2013;190(2):419-426.
• Ng KL. The Etiology of Prostate Cancer. In: Bott SRJ, Ng KL, editors. Prostate Cancer. Brisbane (AU): Exon Publications; 2021.