What is a Gleason score and what do the numbers mean

Understanding Your Gleason Score

The Gleason score is one of the most important tools doctors use to understand prostate cancer and help guide treatment decisions. Let me break down what it means and why it matters.

What Is a Gleason Score?

A Gleason score is a grading system that describes how abnormal your prostate cancer cells look under a microscope compared to normal prostate cells. Think of it as a "grade" for how aggressive your cancer appears to be. The more abnormal the cells look, the higher the score—and generally, the more aggressive the cancer may behave.

How the Numbers Work

The Gleason score is actually two numbers added together, which can be confusing at first:

Each number ranges from 1 to 5:

• 1-2 = Cancer cells look very similar to normal prostate cells (least aggressive)
• 3 = Cancer cells look somewhat abnormal
• 4 = Cancer cells look quite abnormal
• 5 = Cancer cells look very abnormal and aggressive (most aggressive)

Your pathologist examines your biopsy sample and identifies:

1. The most common pattern of abnormal cells (first number)
2. The second most common pattern (second number)

These two numbers are added together to create your final Gleason score.

What the Final Score Means

• Gleason 6 or less = Lower grade (less aggressive appearance)
• Gleason 7 = Intermediate grade (moderate aggressiveness)
  • 3+4 = slightly less aggressive
  • 4+3 = slightly more aggressive
• Gleason 8-10 = Higher grade (more aggressive appearance)

Important Context

According to the CancerPatientLab webinar on prostate cancer management, when patients are first diagnosed with prostate cancer, they typically receive a Gleason score along with a risk classification (low risk, intermediate risk, or high risk). This helps doctors and patients understand what treatment options might be most appropriate.

However, here's a critical point: The Gleason score is just ONE piece of information. Your doctors also consider:

• Your PSA level (prostate-specific antigen—a protein your prostate produces)
• The stage of your cancer (how far it has spread)
• Your age and overall health
• Genetic testing results (like BRCA mutations or other DNA repair gene mutations)
• Imaging scans showing whether cancer has spread

Questions to Ask Your Doctor

If you have a Gleason score, consider asking your oncologist:

1. What is my specific Gleason score, and what does it mean for my individual case?
2. How does my Gleason score affect my treatment options?
3. Are there other tests (like genetic testing or imaging) that will help guide my treatment?
4. How often will my cancer be monitored, and what will we be looking for?
5. What is my risk category (low, intermediate, or high), and what does that mean?

This information is for educational purposes only. Always consult your healthcare team for personalized medical advice and decisions.