Biomarker Resource Center
Bladder Cancer Biomarkers
Reviewed by XpertPatient Medical Advisory · Updated June 2026 · Sources: NCI · ACS · ASCO · NIH/PMC
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What is a biomarker?
A biomarker is a signal your cancer leaves behind. Doctors find these signals in your blood or tumor tissue. The signals tell your doctor important things — like what type of cancer you have and how it is behaving.
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 your doctor and you have a more informed conversation about next steps.
Everyone’s cancer is different — even people with the same type of cancer can have very different results. That is why biomarker testing matters. It helps your care team understand your cancer specifically.
For Bladder Cancer
Why do biomarkers matter in bladder cancer?
Biomarker testing in bladder cancer helps your doctor understand the specific makeup of your tumor. That information is increasingly important as more options have become available in recent years. Ask your doctor whether biomarker testing is part of your workup.
💬 A good question to ask your doctor: If you have advanced bladder cancer, ask your doctor whether your tumor has been tested for FGFR3 and PD-L1. These are commonly tested markers in this setting.
The most important bladder cancer biomarkers are FGFR3 mutation status and PD-L1 expression. Together they help your doctor understand whether targeted approaches or immunotherapy may be worth discussing for your care.
Patient Poll
Have you had biomarker testing for your bladder cancer?
The Tests Your Doctor May Order
🔍 Does your cancer have a specific gene change?
FGFR3 is a gene that, when mutated, can drive bladder cancer growth. Testing for this mutation is commonly done in advanced bladder cancer. If your tumor has this finding, your doctor will discuss what approaches may be worth considering. Ask your doctor whether FGFR3 testing has been done and what your result means.
🔍 How does your tumor interact with your immune system?
PD-L1 is a protein that affects how your immune system responds to cancer. Testing PD-L1 levels is commonly done in bladder cancer. Ask your doctor what your PD-L1 result means and how it fits into your overall picture.
🔍 Is a protective gene changed in your tumor?
TP53 changes are found in some bladder cancers and give your doctor information about how the cancer may be behaving. Ask your doctor whether TP53 testing was done and what the result means for your care.
Watch & Learn
Important: This page is for education only. It is not medical advice. Every patient’s situation is different. Please talk to your doctor or care team about what your biomarker results mean for you specifically.
Common Questions
Bladder Cancer Biomarkers — Your Questions Answered
Should I ask about FGFR3 testing?
If you have advanced or metastatic bladder cancer, it is worth asking your doctor whether FGFR3 testing has been done. This test is commonly used in this setting.
What does PD-L1 testing tell my doctor?
PD-L1 is one of the markers your doctor may use when discussing certain care approaches. Ask your doctor what your PD-L1 result means for your situation.
Should I ask about broader genetic testing?
Some patients with bladder cancer may benefit from broader genetic testing. Ask your doctor whether this is worth considering for your situation, especially if standard approaches have not worked as hoped.
Is there a patient support community for bladder cancer?
Yes. The Bladder Cancer Advocacy Network (BCAN) at bcan.org is a trusted resource for patients and caregivers. They can help connect you with support and information.
Quick Links
From the Bladder Cancer Center on XpertPatient
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Visit the Bladder Cancer Center → Full Biomarkers Guide →
