The CD274 gene makes PD-L1, a protein on cell surfaces that helps keep the immune system from overreacting. If this signaling is too low, immune responses may become less controlled, and if it is too high, some cancers may hide from immune cells. This gene can play a role in how your body responds to cancer treatment, especially immunotherapy that targets the PD-1/PD-L1 pathway. Public awareness of CD274 grew as PD-L1 testing became a common part of care for cancers such as lung cancer.
What is a gene?
Genes are sections of DNA that give your cells instructions for making molecules or directing processes in the body. Some genes carry the information needed to make proteins, which are the cell's working parts. Other genes mainly regulate when certain processes happen, where they happen, and how active they are. Together, genes affect how the body develops and works, and they can influence how you respond to food, stress, or medications. For a more in depth look at this topic, you can find more in the LearnHub.
Overview
CD274Gene function
What if the gene works
Your cells use the CD274 gene to make a surface protein that helps calm immune cells. This supports immune balance, limits unnecessary inflammation, and helps protect healthy tissues.
Risk
What if the gene does not work
When the CD274 gene works less well, cells may show reduced PD-L1 signaling, so immune brakes are weaker and T cells stay more active. Milder variants may partly reduce signaling, while more severe variants can cause clearer loss.
Treatment
What does that mean for your treatment
No CD274-specific treatment or management approach is currently established for people carrying a pathogenic variant in the CD274 gene. In cancer care, CD274 activity in the tumor, usually measured as PD-L1 expression rather than an inherited variant, can help guide use of immune checkpoint medicines such as pembrolizumab or nivolumab.
Gene function
What if the gene works
Your immune system needs signals that tell it when to attack and when to ease off. The CD274 gene helps make one of these signals, called PD-L1, on the surface of cells. This is a key part of how the CD274 gene helps control the immune system while protecting healthy tissue during everyday inflammation.
Cells use the CD274 gene to place PD-L1 on their surface. PD-L1 can bind PD-1 on certain immune cells and tell them to slow down or pause their attack.
By easing immune activity at the right time, PD-L1 helps limit strain on healthy tissues during infection or inflammation. This keeps the response more measured after immune cells have recognized a threat.
The CD274 gene supports immune tolerance, which means the body is less likely to react to its own healthy cells. This steady background signal helps everyday immune responses stay balanced.
What is a variant?
A genetic variant is a minor change in a gene’s DNA sequence. These changes are common and help make up normal human diversity, including differences in appearance, metabolism, and the way the body reacts to environmental influences. Many have no noticeable effect and are simply part of natural genetic variation. Sometimes, though, a variant changes how a gene works more substantially and may contribute to or cause a genetic condition.
Genetic variants
What if the gene does not work
Variants in the CD274 gene can change how much PD-L1 is made or how well it reaches the cell surface. Some CD274 gene variants also alter the protein’s shape, stability, or ability to bind PD-1. Across the CD274 gene variant effects spectrum, milder variants may only partly lower activity, while more severe variants can greatly reduce or stop protein production.
How variants are linked to conditions
Changes in the CD274 gene do not yet have a broadly confirmed link to a specific inherited health condition, although research on possible CD274 gene variant disease associations is still developing. If you carry a reported variant in the CD274 gene, your doctor or genetic counselor can explain what that result means in the context of your personal and family history.
A variant is not necessarily a diagnosis
Variants in genes are a usual part of human biology and are widely seen in the general population. Most have no direct impact on health and simply reflect natural human diversity. For many genes, carrying a variant associated with a condition indicates a possible link rather than a definite diagnosis, especially when several genes and environmental factors also play a part. In some situations, though, a single well-characterized variant in a particular gene can be enough to confirm a diagnosis.
Are there things that can increase or change my risk?
There is not yet broadly confirmed evidence on specific factors that increase or reduce health risk related to the CD274 gene itself. If a CD274 result came up on genetic testing, a doctor or genetic counselor can help explain what it may mean in the context of your personal and family history.
Inheritance of CD274 variants
There is not yet a broadly confirmed Mendelian pattern for the inheritance of the CD274 gene variants in relation to a specific inherited condition. Most discussion of the inheritance of the CD274 gene variants is still limited, and this may become clearer as research develops. The CD274 gene is located on chromosome 9, which is an autosome, so you inherit one copy from each parent.
What does my CD274 result mean for my family?
There isn't yet a broadly confirmed inherited pattern tied to a specific health condition for CD274, though this can become clearer as research grows. If you have a specific CD274 result and want to understand what it could mean for relatives, a doctor or genetic counselor can explain it in the context of your personal and family history.
Genetic information
Genetic testing
How you find out about variants
To find out whether you carry a variant in the CD274 gene, a lab can analyze DNA from a blood sample, saliva, or tumor tissue, depending on why testing is being done. This CD274 genetic testing process reads the gene’s sequence and looks for changes, then the report explains whether a variant was found and how it is classified.
When should I consider getting a genetic test?
There isn't yet a broadly established, CD274-specific reason for most people to have genetic testing. Decisions are usually made with a doctor or genetic counselor based on personal or family history, and in cancer care doctors more often check PD-L1 levels in the tumor than look for an inherited CD274 change.
A genetic result is only one part of your health story
Genetic findings can give useful insight, yet the amount they explain varies with the condition and the specific type of variant. Over time, many factors, including lifestyle, environment, age, and medical history, also influence how the body functions. In some conditions, particularly those shaped by many genes, genetic information provides context rather than certainty and is most useful when considered together with other parts of care. In other situations, a genetic finding may offer a clear answer. In areas like medication response, genetic results can help put a person’s experiences in context.
Pharmacogenetics
How variants shape your response to medicine
Genetic variation can affect how people respond to medicines. This helps explain why the same treatment works well for one person, seems weaker for another, or causes more side effects in someone else. Differences in how the body absorbs, breaks down, transports, or responds to a drug are common, and they can influence both benefit and sensitivity to treatment.
What is Pharmacogenetics?
Pharmacogenetics examines how inherited genetic differences can affect the way a person responds to medicines. It studies the relationship between genes and medications to clarify why the same treatment may work differently in different people. For many drugs, genes can influence both how powerfully a medicine works and how the body handles it. This information can support treatment choices that are more informed and more tailored to the individual. More detail on this topic is available in the LearnHub.
Drugs influenced by the CD274 gene
When should I seek medical advice?
There isn't yet a broadly confirmed role for this gene in guiding routine medication response, so questions about medicines, side effects, or treatment changes are best discussed with your doctor. CD274 is studied mainly in cancer care because PD-L1 levels in a tumor can sometimes help doctors judge whether certain immunotherapy treatments are more likely to help.
History
The CD274 gene entered cancer research in the late 1990s, when scientists identified its protein product and first called it B7-H1. Initially understood only through visible traits, later recognized as tied to a specific gene, this pathway soon became important in studies of how tumors interact with the immune system. From these first observations, research expanded steadily. In the 2000s and 2010s, discoveries around the PD-1 and PD-L1 pathway helped reshape cancer treatment and supported the development of immune checkpoint drugs. Public and medical awareness grew as these treatments began helping some people with melanoma, lung cancer, and other cancers. Today, the CD274 gene is best known as part of that major shift in modern oncology.