Key takeaways
- Richter’s syndrome is a rare condition where chronic lymphocytic leukemia transforms into a more aggressive lymphoma, most commonly diffuse large B-cell lymphoma.
- Symptoms of Richter’s syndrome can include rapidly increasing lymph node size, night sweats, weight loss, and fever, but diagnosis requires a biopsy to differentiate it from typical CLL progression.
- Treatment options, usually a combination of chemotherapy and immunotherapy, aim for short-term remission, with stem cell transplants considered for potential long-term survival, though the overall outlook is generally not good.
Richter’s syndrome generally has links to negative survival rates. However, treatments may help a person achieve short-term remission.
This article discusses what Richter’s syndrome is, its symptoms, causes, and more.
Chronic lymphocytic leukemia (CLL) is a type of cancer that affects white blood cells. Richter’s syndrome occurs when CLL quickly transforms into an aggressive form of lymphoma (cancer of the lymphatic system).
The lymphatic system is a network of vessels, ducts, and nodes that pass through most bodily tissues, allowing cancer to spread quickly if it enters this system.
Richter’s syndrome most often transforms into diffuse large B-cell lymphoma (DLBCL). In rare cases, it may transform into Hodgkin’s lymphoma. Due to the transformation, experts often refer to this condition as Richter’s transformation.
Richter’s syndrome is relatively rare.
One study from 2022 noted that data from the Surveillance, Epidemiology, and End Results (SEER) database involving over 74,000 people with CLL indicates a transformation rate of about 0.7%. However, the study authors also noted that other studies report incident rates from about 1% to 23%.
Still, other and different research suggests an average occurrence of about 2% to 10%.
Health experts associate Richter’s syndrome with a generally negative outlook, but some research highlights positive treatment outcomes.
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Richter’s syndrome can cause several potential symptoms.
One of the most common symptoms is a rapid and dramatic increase in the size of lymph nodes. A person may notice swelling in areas such as the:
A person may also notice the following:
Additional symptoms or signs can include:
- palpitations
- low platelet (small blood cell) levels that cause bleeding or bruising
- fatigue
- shortness of breath
- dizziness
Healthcare professionals may discover an increase in serum lactate dehydrogenase or elevated serum calcium (hypercalcemia) on a routine blood test. Having this information could help with diagnosis.
The exact cause of Richter’s syndrome is unclear and may involve several factors, including:
- clinical features and biological characteristics of CLL cells
- specific gene mutations
- certain inherited genetic characteristics, which may include LRP4, BCL-2, or CD38 genotypes
Risk factors for Richter’s syndrome
For example, certain tumor cell features are potential risk factors for Richter’s syndrome. The loss of a section of certain chromosomes in tumor cells or atypical proteins in tumor cells may increase a person’s risk.
Another possible risk factor is a person having previously received treatment for CLL.
The symptoms of Richter’s syndrome can mimic those of other noncancerous illnesses and conditions. Therefore, a person should consider consulting a healthcare professional to determine the reason behind their symptoms.
A healthcare professional may suspect Richter’s syndrome if a person has CLL or has previously received a CLL diagnosis.
They may start with ordering a PET scan. This scan can help them determine the most suitable lymph nodes for a biopsy.
If a healthcare professional suspects someone may have Richter’s syndrome, they will likely ask a surgeon to perform a biopsy or order a CT scan of an enlarged lymph node. The biopsy can help them determine if it is a typical progression of CLL or the development of Richter’s syndrome.
Treatment will depend on what subtype of Richter’s syndrome a person has. As most cases become DLBCL, the standard first-line treatment for this type of lymphoma often involves a combination of chemotherapy and immunotherapy.
People with Hodgkin’s lymphoma typically receive chemotherapy as their primary treatment without immunotherapy.
The therapies can often achieve at least short-term remission. They also have links to several potential side effects.
If a person enters remission, a doctor can perform a stem cell transplant. This is the only current DLBCL therapy associated with long-term survival.
Experts describe the outlook for Richter’s syndrome as negative. They report a median survival rate of 10 months. The most important aspect of the outlook is the relationship between the transformed DLBCL and the underlying CLL.
Research from 2024 indicates that a person who goes into remission and receives a stem cell transplant may have a longer life expectancy.
Researchers are continually looking into new treatments that may improve survival rates. A person may want to talk with a healthcare professional about joining a clinical study to help advance new, potentially helpful treatments.
Richter’s syndrome is a rare transformation of CLL into an aggressive form of cancer. Experts associate the condition with a negative outlook and short life expectancy.
The most common symptom is an unusual enlargement of lymph nodes.
While the exact cause is unknown, experts suspect possible causes include differences in cancer cells, genetics, and other contributing factors.
Treatment typically includes a combination of chemotherapy and immunotherapy to aid short-term remission. A doctor may also recommend a stem cell transplant to support a longer remission period.