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Biomarkers (short for biological markers) are molecules that can tell doctors about what is happening inside your body. They can be found in your blood and other bodily fluids or tissues. For those with certain types of cancer, biomarkers may provide information about the cancer and how to treat it. Biomarkers is short for "biological markers." They may also be called molecular markers, signature molecules or genotypes.

A biomarker test may offer medical providers a wealth of information, including:

  • Normal or unusual cell function
  • What might happen if the cancer is not treated
  • How the cancer might respond to a specific treatment plan
  • Whether a person may react poorly to certain treatments
  • How likely the cancer is to come back (recur)

Knowing your biomarker status may help you and your doctor decide on the most effective treatment plan for you. It may also help avoid treatments that may not work for your type of cancer. Not every type of cancer can be tested for biomarkers. This may change as scientists study biomarkers for different cancer types.

This page was created in collaboration with our expert partners. It includes several sections of educational resources like downloadable worksheets, videos and client stories. As always, you and your doctors are partners in your care. This information is intended to supplement conversations about biomarkers with your treating health care team. Your care team knows your cancer and your health best.

What Are Biomarkers?

Biomarkers are molecules that can tell doctors about what is happening inside your body. They may be able to show how that condition is responding to treatment. Biomarkers do not describe how a person feels. Instead, they share how the body is working.

Some biomarkers are simple. Examples include blood pressure, heart rate or the results of blood and urine tests. Other biomarkers measure information at the molecular or cellular level. These more complicated measurements require lab testing. These tests study genes, proteins and hormones in the body. They also study genetic material that is shed into the bloodstream from cancer cells.

Researchers use biomarker information to create new treatments. Doctors use it to help make informed decisions about treatment.

Biomarker Testing

Biomarker testing is a way for the health care team to learn more about a person's cancer. It can also be called genomic testing, molecular profiling or testing for mutations. Biomarker tests do not diagnose cancer. Instead, biomarker testing will help your doctors find out if your cancer has specific characteristics or traits.

After a blood or tissue sample is collected, it is sent to a lab to be studied. A specialist called a pathologist analyzes the sample and looks for specific characteristics. These characteristics are based on the type of cancer or the biomarkers being tested.

Depending on type of test, results can take anywhere from 2 to 6 weeks to be returned. Your doctor can help explain what the results mean.

Types of Biomarkers

In 2015, the U.S. Food and Drug Administration (FDA) and the National Institutes of Health (NIH) sorted biomarkers into 7 categories. They are:

  • Risk (also called susceptibility). Shows the potential for someone to develop a disease or condition that they do not currently have.
  • Diagnostic. Detects or confirms the presence of a disease or condition.
  • Monitoring. Checks the status of a disease or condition.
  • Prognostic. Identifies the likelihood of a disease or condition occurring, recurring (returning) or progressing (becoming more serious).
  • Predictive. Suggests how a person’s body will respond to a drug or treatment.
  • Response. Shows that a person’s body has reacted in some way to a drug or treatment. This can sometimes also be called "pharmacodynamic," meaning what a drug does to the body.
  • Safety. Shows the chance a person will have an adverse effect to a drug or treatment or how strong the effect might be.

Common Cancer Biomarkers

Scientists have not identified biomarkers for every type of cancer. Some biomarkers may be important for multiple types of cancer. Researchers are studying more biomarkers for different cancer types.

Here is a brief list of some common biomarkers and their associated cancer type(s):

BiomarkerAssociated Cancer Type(s)
ALK gene rearrangements and overexpressionnon-small cell lung cancer, anaplastic large cell lymphoma
BRCA1 and BRCA2 gene mutationsovarian cancer, breast cancer
EGFR gene mutationnon-small cell lung cancer
Estrogen receptor (ER) and progesterone receptor (PR)breast cancer
FGFR2 and FGFR3 genebladder cancer
FLT3 gene mutationsacute myeloid leukemia
HER2 gene amplification or overexpressionbreast cancer, ovarian cancer, bladder cancer, pancreatic cancer, gastric cancer, stomach cancer
KRAS gene mutationcolorectal cancer, non-small cell lung cancer
Programmed death ligand 1 (PD-L1)non-small cell lung cancer, liver cancer, stomach cancer, gastroesophageal junction cancer, Hodgkin lymphoma, other lymphoma subtypes
Prostate-specific antigen (PSA)prostate cancer

Explore more cancer biomarkers from the National Cancer Institute.

What Are Biomarkers?

What are biomarkers, and what can biomarker testing mean for your cancer and your care?

HER2 in Cancer

Mutations in the HER2 gene (human epidermal growth factor receptor 2 gene) can play a role in many types of cancer. Learn more about HER2 and what your HER2 status may mean for your treatment.

For Cancer Patients, Biomarkers Matter

Learn more about how cancer biomarkers offer important clues that can help direct your care.
(View in: Spanish/Español; Mandarin/中文.)

For Cancer Patients, Mutations Matter

Learn more about how molecular profiling can identify specific mutations, or biomarkers, that tell you and your doctor about your cancer and how it might be treated.
(View in: Spanish/Español; Japanese/日本語; Korean/한국어; Mandarin/中文; Thai/ไทย.)

Targeted Therapy in Cancer

Targeted therapies focus on a specific mutation or biomarker seen in different kinds of cells, which means that different drugs affect the body in different ways. Learn more about targeted treatments for cancer in this video.

FGFR Alterations in Cancer

Inside your cells, there is a family of four FGFR (fibroblast growth factor receptor) genes. Alternations in FGFR genes are associated with many types of cancer, including lung, breast, bladder and liver cancers.

FGFR Inhibitors for Cancer

FGFR (fibroblast growth factor receptor) gene mutations and gene fusions are seen in certain types of cancer. FGFR inhibitors may block the FGF receptors on cancer cells, reducing signals that trigger the growth of cancer cells.

Biomarker Basics

Biomarkers may help your doctors learn more about your cancer. Learn about the basics of biomarkers from Dr. Mark Kris, Medical Oncologist at Memorial Sloan Kettering Cancer Center.

How Biomarkers Impact Cancer Treatment

Learn about the impact biomarkers can have on cancer treatment decisions from Dr. Mark Kris, Medical Oncologist at Memorial Sloan Kettering Cancer Center.

Biomarker Testing Myths

Learn about biomarker testing from Dr. Mark Kris, Medical Oncologist at Memorial Sloan Kettering Cancer Center.

Best Practices for Biomarker Testing Coverage Webinar

Learn about best practices for obtaining biomarker testing coverage.

Warren W.

alt textWarren’s cancer experience began in the early 2000s. A few years ago, he had a recurrence and was found to have stage IV lung cancer that was inoperable. However, he participated in a clinical trial and was given an immunotherapy drug based on his biomarkers, shrinking the original tumor.

Though biomarkers ultimately had a deep impact on his care, he wishes he had been more involved in conversations with his care team. “I had to do research on my own. I can’t regurgitate information about biomarkers and ALK, but I searched on the internet so that I could at least understand what my doctors were telling me—the same way a businessperson tracks their profit margin or gross revenue,” he shares. “Having a level of comfort that we’re talking the same language would be helpful to patients, who are dealing with so much already.”

Learn more about biomarker basics.

Erica W.

alt textErica was diagnosed with stage IVB ovarian cancer in May 2020. Her surgeon suggested biomarker testing, and she was found to have the BRCA2 mutation. Because of these results, Erica’s care team knew she would respond better to a specific treatment designed for people with this mutation. She is currently on maintenance therapy to stop her tumor from growing.

Interestingly, her son had bought her an ancestry kit as a gift a few years prior to her diagnosis, and her results had included information about her BRCA2 mutation. “I didn’t think much of it at the time,” Erica says. “I should have gone to my physician and asked about it. I waited too long, but hopefully now I can help others by sharing how good it is to know your biomarker status.”

Browse our video library and watch expert responses to patient questions about biomarkers.

Angela R. W.

alt textAngela was diagnosed with breast cancer following an annual mammogram in October 2019. She spent her 65th birthday that year getting a needle biopsy and soon after met with a genetic counselor. Cancer is prevalent in Angela’s family. Three aunts had metastatic breast cancer; her maternal grandmother had bone cancer and decided not to pursue treatment; other relatives had lung cancer, leukemia and various recurrences. Knowing this, she had “a quick mental shutdown,” but then started using what she knew from family to advocate for herself and her treatment, asking her doctors for a double mastectomy.

She also received biomarker testing and found that she was negative for the BRCA genes. However, her cancer was hormone-positive, which affected her treatment. She completed her primary treatment in summer 2020 and is now taking a hormone receptor-based maintenance drug. “I wish I’d know more about the cancer in our family,” Angela admits. “My attitude is ‘your business is your business’; I don’t say, ‘Hey, tell me about your cancer.’ But at a family reunion we brought this up and realized we need to spend more time documenting our medical histories.”

Our printable My Cancer Family History worksheet can help you record information about cancer within your family.

Jasmine P.

alt textJasmine found a lump in her breast in the summer of 2019, at age 26. She noticed it growing and asked a specialist for a mammogram, but was told she was too young to receive one. Eventually she received a diagnosis of triple-negative breast cancer. Prior to this experience, she knew of a history of cancer within her family: her paternal grandmother, two great-aunts and her great-grandmother had all passed from breast cancer. She also had an aunt who had been diagnosed with ovarian cancer and had tested positive for the BRCA1 gene.

She knew that her father was BRCA positive—but, because there wasn’t a family history of cancer for anyone so young, she didn’t feel an urgency to get tested herself at the time. She notes, “Since we found out about the gene, one of my dad’s cousins has created a cancer family tree. It’s so pervasive that insurance has made allowances to cover testing for extended family members. Out of everyone, only three have come back negative for the gene.” She’s been in remission for over a year now, but after receiving mixed advice from doctors regarding her diagnosis, her future and her fertility, she wishes she could have more specific answers about what her BRCA status means for her future.

To find more information about biomarkers for specific cancer diagnoses, view additional resources from other advocacy organizations.

CancerCare has developed various biomarkers worksheets and educational resources to help you throughout your cancer experience.

In additional to viewing and downloading these resources, you may select worksheets and publications to email to yourself for easy access. Simply click the box to a publication and click the "Email Results" button.

Printable Worksheets

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Questions to Ask Your Doctor Before Biomarker Testing

Biomarker testing is a way of learning more about certain forms of cancer. Not every form of cancer has testable biomarkers and different biomarkers give different kinds of information. This worksheet can help guide a discussion with your doctor.

View and Print Worksheet »

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Questions to Ask Your Doctor After Biomarker Testing

After biomarker testing, your health care team may have more information about your cancer and treatment options. This worksheet can help guide your discussion about the results and what they mean for you.

View and Print Worksheet »

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My Cancer History

It can be helpful to keep a reference document with information about your cancer diagnosis, treatment and post-treatment care plan. These details can be shared with your primary care provider, with family members or if your treating health care team changes.

View and Print Worksheet »

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My Cancer Family History

This template can help you collect information about cancer within your family, which can be useful to your health care team. Along with cancer types, you can record treatment types, biomarker testing results and more.

View and Print Worksheet »

Educational Publications

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Fact Sheet: Biomarkers and the Treatment of Cancer

This fact sheet offers basic information about biomarkers and biomarker testing. For more in-depth information, read the booklet below or speak to your treating health care team.

Read Online or View PDF »

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Booklet: Understanding the Role of Biomarkers in Treating Cancer

This longer booklet gives an overview of biomarkers, their role in treating cancer, frequently asked questions and more.

Read Online or View PDF »

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Fact Sheet: What People With Cancer Should Know About Biomarker Testing

This fact sheet provides basic information about cancer biomarkers, biomarker testing, and what people with cancer should know about the role that biomarkers can play in guiding treatment decisions.

Read Online or View PDF »

There are many resources to help you learn about the role of biomarkers for specific cancer types.

Colorectal Cancer Alliance

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