High-grade B-cell lymphoma is an aggressive form of blood cancer that grows quickly and requires prompt medical attention. This condition, sometimes called double-hit or triple-hit lymphoma, affects white blood cells and can spread rapidly through the body’s lymphatic system. Understanding this disease helps patients and families navigate treatment options and make informed decisions about care.
What Is High-Grade B-Cell Lymphoma?
High-grade B-cell lymphoma is a type of fast-growing non-Hodgkin lymphoma, which is a cancer that starts in the lymphatic system. The lymphatic system is a large network of organs, vessels, and tissues that helps the body fight infection and disease. In this condition, abnormal lymphocytes (a type of white blood cell) multiply out of control and form tumors.[1]
What makes high-grade B-cell lymphoma unique is that it involves specific genetic changes. The cancer cells have rearrangements, meaning parts of genes switch places within chromosomes. One rearrangement involves the MYC gene, and the other involves either the BCL2 gene or, less commonly, the BCL6 gene. When both the MYC and BCL2 or BCL6 genes are rearranged, doctors call it “double-hit” lymphoma. When all three genes are rearranged, it’s called “triple-hit” lymphoma.[1]
This disease shares features with two other types of B-cell lymphomas: diffuse large B-cell lymphoma and Burkitt lymphoma. About five percent of diffuse large B-cell lymphomas and about 32 to 78 percent of Burkitt lymphomas have these dual gene rearrangements and are classified as high-grade B-cell lymphoma. However, research has shown that this condition differs in important ways from other lymphomas that don’t have these gene changes. For this reason, in 2016, the World Health Organization designated high-grade B-cell lymphoma as its own category of B-cell non-Hodgkin lymphoma.[1]
Because it is an aggressive type of lymphoma, high-grade B-cell lymphoma grows and spreads quickly. This means treatment usually needs to start soon after diagnosis. The disease can develop in lymph nodes or in other parts of the body where lymphoid tissue is found.[3]
How Common Is High-Grade B-Cell Lymphoma?
B-cell lymphomas as a group are quite common, accounting for 85 percent of all non-Hodgkin lymphoma cases. The American Cancer Society estimates that 80,600 people will receive a non-Hodgkin lymphoma diagnosis in 2024. However, by comparison, more than 2 million people will learn they have some type of cancer that year, showing that lymphoma is relatively uncommon compared to all cancers combined.[2]
High-grade B-cell lymphoma represents a unique subset within diffuse large B-cell lymphoma, which is itself the most common type of non-Hodgkin lymphoma. Diffuse large B-cell lymphoma makes up more than 40 out of 100 cases (40 percent) of non-Hodgkin lymphoma in adults. Each year, about 5,000 people are diagnosed with diffuse large B-cell lymphoma in the United Kingdom alone.[6]
Because high-grade B-cell lymphoma is a relatively new diagnostic category established in 2016, specific statistics for this subtype are still being collected. Healthcare professionals use specialized genetic tests to distinguish high-grade B-cell lymphoma from other types of aggressive B-cell lymphomas, which helps ensure patients receive the most appropriate treatment.[1]
Causes of High-Grade B-Cell Lymphoma
The exact causes of high-grade B-cell lymphoma are not fully understood. What researchers do know is that the disease involves specific genetic changes in B-cells, which are a type of white blood cell. These cells normally help the body fight infections by producing antibodies. In high-grade B-cell lymphoma, genetic rearrangements occur in chromosomes, specifically affecting the MYC gene along with either the BCL2 or BCL6 gene.[1]
These genetic changes cause the B-cells to multiply rapidly and abnormally. The rearranged genes affect how cells grow, divide, and die. When both MYC and BCL2 or BCL6 are affected, the cells receive signals that promote uncontrolled growth while also preventing normal cell death. This combination creates particularly aggressive cancer cells that can spread quickly through the lymphatic system and beyond.[3]
It’s important to understand that these genetic changes happen within a person’s cells during their lifetime, not from parents passing genes to their children. The changes occur in the DNA of B-cells as they develop or mature. Scientists are still working to understand what triggers these specific genetic rearrangements, but they believe it involves multiple factors affecting how cells divide and repair DNA damage.[1]
Risk Factors
While the specific causes of high-grade B-cell lymphoma remain under investigation, certain factors may increase the risk of developing B-cell lymphomas in general. People with weakened immune systems appear to be at higher risk. This includes individuals who have received organ transplants and take medications to suppress their immune system, as well as people living with HIV or AIDS.[4]
Age plays a role in non-Hodgkin lymphoma risk. The median age at first diagnosis for non-Hodgkin lymphoma is about 70 years, though high-grade B-cell lymphoma can affect people at various ages. Some types of B-cell lymphoma are more common in males than females, though this varies by specific subtype.[5]
Certain infections may also increase risk. For example, the Epstein-Barr virus has been associated with some types of B-cell lymphomas. However, it’s important to note that most people with these risk factors will never develop lymphoma, and many people diagnosed with high-grade B-cell lymphoma have no known risk factors.[2]
Symptoms and How They Affect Daily Life
The symptoms of high-grade B-cell lymphoma are similar to those of other aggressive B-cell lymphomas. The most common symptom is swollen lymph nodes, which might appear as painless lumps in the neck, underarms, or groin. These swellings occur because abnormal lymphocytes accumulate in the lymph nodes, causing them to enlarge.[2]
Many people with high-grade B-cell lymphoma experience profound fatigue that doesn’t improve with rest. This tiredness can be so severe that it interferes with work, school, and everyday activities. The exhaustion stems from the cancer affecting the body’s normal blood cell production and the immune system working overtime to fight the disease.[2]
Night sweats are another common symptom. These aren’t just feeling warm or slightly damp during sleep. People with lymphoma often experience “drenching” night sweats that soak through pajamas and bedsheets, requiring them to change clothes or bedding during the night. These episodes can disrupt sleep and leave people feeling more tired during the day.[2]
Some people develop abdominal pain if the lymphoma affects organs in the belly area. The spleen or liver might become enlarged, causing discomfort or a feeling of fullness. Unexplained weight loss and fevers without an obvious infection can also occur. These symptoms develop because the cancer cells spread through the body and affect normal organ function.[2]
Because high-grade B-cell lymphoma grows quickly, symptoms often develop relatively fast. This differs from slow-growing lymphomas where people might not notice symptoms for months or years. The rapid progression means that people usually develop symptoms that prompt them to seek medical attention, leading to diagnosis.[6]
Prevention
Unfortunately, there are no known specific ways to prevent high-grade B-cell lymphoma. Because the exact causes of the genetic changes that lead to this disease remain unclear, targeted prevention strategies have not been identified. The genetic rearrangements that characterize high-grade B-cell lymphoma happen spontaneously within cells, and researchers haven’t yet discovered how to stop these changes from occurring.[1]
That said, maintaining a healthy lifestyle supports overall health and may help reduce cancer risk in general. This includes eating a balanced diet rich in fruits, vegetables, and whole grains, staying physically active, maintaining a healthy weight, and avoiding tobacco products. While these practices haven’t been proven to prevent high-grade B-cell lymphoma specifically, they support the immune system and overall wellbeing.[2]
For people with conditions that weaken the immune system, such as HIV, working closely with healthcare providers to manage those conditions is important. Regular medical care and appropriate treatments for underlying conditions may help reduce some risk factors associated with developing lymphomas in general.[4]
Because high-grade B-cell lymphoma cannot be prevented, early detection becomes even more important. People should pay attention to their bodies and seek medical evaluation if they notice persistent swollen lymph nodes, unexplained fevers, drenching night sweats, or unusual fatigue that doesn’t improve. While these symptoms can have many causes, prompt evaluation ensures that if lymphoma is present, it can be diagnosed and treated quickly.[2]
How High-Grade B-Cell Lymphoma Affects the Body
To understand how high-grade B-cell lymphoma affects the body, it helps to know about normal B-cell function. B-lymphocytes are white blood cells that play a crucial role in the immune system. They develop in the bone marrow and travel through the lymphatic system, which includes lymph nodes, the spleen, bone marrow, and other organs. When the body encounters an infection, B-cells produce antibodies to fight it.[2]
In high-grade B-cell lymphoma, genetic rearrangements cause B-cells to behave abnormally. Instead of developing normally and helping fight infection, these cells multiply rapidly and uncontrollably. The rearrangements in the MYC gene along with BCL2 or BCL6 genes create a particularly dangerous combination. The MYC gene promotes cell growth and division, while BCL2 prevents cells from dying when they should. When both are altered, cells receive signals to grow rapidly while also avoiding normal death processes.[3]
As abnormal B-cells accumulate, they form tumors in lymph nodes and can spread to other organs. The lymphatic system extends throughout the body, so these cancer cells can travel widely. They may affect the bone marrow where blood cells are made, the spleen which filters blood, and other organs like the liver, lungs, or digestive system. When cancer cells infiltrate the bone marrow, they can interfere with the production of normal blood cells, leading to anemia, increased infections, and bleeding problems.[2]
High-grade B-cell lymphoma has a particular tendency to spread to the central nervous system, which includes the brain and spinal cord. This is more common with this type of lymphoma than with some other types. When cancer cells reach the brain or spinal cord, they can cause additional symptoms like headaches, vision changes, or neurological problems. Because of this risk, doctors often include preventive treatment targeting the central nervous system in the treatment plan.[3]
The rapid growth characteristic of high-grade B-cell lymphoma means that changes in the body happen relatively quickly. Unlike slow-growing lymphomas where the disease might be present for years before causing problems, high-grade B-cell lymphoma tends to cause symptoms within weeks or months of developing. This aggressive behavior requires prompt treatment, but it also means that the cancer cells may be more sensitive to chemotherapy drugs that target rapidly dividing cells.[6]
