Biomarker Resource Center
Prostate Cancer Biomarkers
Reviewed by XpertPatient Medical Advisory · Updated August 2026 · Primary Source: cancer.gov
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What Is a Biomarker — and Why Does It Matter for Your Treatment?
A biomarker is a signal found in your blood or tissue. In prostate cancer, PSA is the main biomarker — a protein your prostate makes that can rise when cancer is present.
Think of it like a clue. Your doctor collects clues from your biomarker test results. Those clues help build a picture of your cancer. That picture helps you have a more informed conversation with your care team about next steps.
How a Biomarker Test Works
A biomarker is a signal your cancer leaves behind. Your doctor finds it through a biopsy or blood test, reads your results, and uses them to choose the treatment most likely to work for your specific tumor.
Why Do Biomarkers Matter in Prostate Cancer?
Prostate cancer can grow slowly or quickly. Biomarker tests help your doctor understand how your cancer is behaving — and which care approach is most appropriate for your situation.
The most important prostate cancer biomarkers are PSA and androgen receptor (AR) status. Together they help your doctor understand how active your cancer is and guide the conversation about your care.
A good question to ask your doctor: Ask your doctor to explain your PSA level and trend over time, and what they mean for your care.
Quick Poll
Have you been biomarker tested?
PSA level and trend are the most important starting points for understanding your prostate cancer.
Source: IQVIA Institute, Advancing Precision Oncology, March 2026 · established biomarker testing rate in metastatic prostate cancer · www.iqviainstitute.org
The Tests Your Doctor May Order
Is a prostate protein elevated in your blood?
PSA is the most widely used prostate cancer blood test. A rising PSA over time is often more meaningful than a single high reading. Ask your doctor what your PSA level and trend mean for your care.
How aggressive are your cancer cells?
The Gleason score describes how different your cancer cells look from normal cells under a microscope. A higher score means more aggressive cancer. Ask your doctor what your Gleason score means for your situation.
Does your cancer depend on male hormones to grow?
Most prostate cancers need testosterone to grow. The AR test looks at whether your cancer has this dependency. Ask your doctor what your AR status means for your care.
Do you have an inherited gene mutation that affects your care?
Some prostate cancers are linked to inherited BRCA mutations. If you have a family history of prostate, breast, or ovarian cancer, ask your doctor whether genetic testing makes sense for you.
Sources: National Cancer Institute · PCF · American Cancer Society
Watch & Learn
Common Questions
Prostate Cancer Biomarkers — Your Questions Answered
What PSA level should I pay attention to?
There is no single danger number. Your doctor looks at your PSA alongside your age, prostate size, and how it has changed over time. Ask your doctor to explain what your specific PSA level and trend mean for you.
What is active surveillance?
Active surveillance means monitoring your cancer closely over time without immediate treatment. It is commonly discussed for slow-growing, low-risk prostate cancer. Ask your doctor whether this approach might be worth discussing.
What does hormone therapy mean for prostate cancer?
Hormone therapy works by reducing testosterone or blocking your cancer from using it. Ask your doctor whether hormone therapy is something worth discussing for your case.
Should I get a second opinion?
Many patients find it helpful to get a second opinion after a prostate cancer diagnosis. Ask your doctor or patient navigator for help finding a specialist.
Knowledge Check
Test what you’ve learned
Three quick questions to help you feel more confident talking with your care team.
What does PSA measure?
Based on what you just read, what does a PSA blood test detect?
What does the Gleason score tell your doctor?
Based on what you just read, what does a higher Gleason score mean?
Why does testosterone matter in prostate cancer?
Based on what you just read, what role does testosterone play?
Keep these in mind for your next appointment.
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