
Rare blood cancers affect thousands of people worldwide, often with devastating consequences. Among these, Burkitt lymphoma stands out due to its aggressive nature and rapid progression.
We are committed to shedding light on these rare conditions, providing insights into their diagnosis, treatment, and the latest research. Understanding the complexities of these diseases is essential for developing effective treatment plans and providing support to those affected.
We will explore the specifics of rare blood cancer diseases, including symptoms, diagnosis challenges, and treatment options. Our goal is to empower patients, caregivers, and healthcare professionals with the knowledge to navigate these complex conditions.
Key Takeaways
- Rare blood cancers, such as Burkitt lymphoma, are aggressive and require prompt diagnosis and treatment.
- Understanding the symptoms and challenges in diagnosing these cancers is vital.
- Advanced research and treatment options are being developed to combat these diseases.
- Support for patients and caregivers is essential in managing rare blood cancers.
- Continued awareness and education are key to improving outcomes for those affected.
Understanding Blood Cancers: An Overview
Blood cancers start with abnormal growth of blood cells. They include leukemia, lymphoma, and myeloma. These diseases can cause health problems, from mild to severe.
How Blood Cancers Develop
Blood cancers start with DNA changes in blood cells. These changes can come from genetics or the environment. For example, some chemicals or radiation can raise the risk.
The disease begins in the bone marrow. When a blood cell’s DNA is damaged, it turns into an abnormal cell. These abnormal cells can take over, causing issues like anemia and bleeding.
Classification of Blood Cancers
Blood cancers are mainly three types: leukemia, lymphoma, and myeloma. Leukemia is a cancer of the blood and bone marrow. Lymphoma affects the lymphatic system. Myeloma is a cancer of plasma cells in the bone marrow.
Each type needs a different treatment plan. Knowing the type of blood cancer is key to finding the right treatment.
Incidence and Prevalence
Blood cancers are a big health issue worldwide. Leukemia, lymphoma, and myeloma are among the most common. They affect millions of people globally.
Knowing how common blood cancers are helps with health planning and care. We’re seeing better ways to diagnose and treat these diseases, giving hope to patients and their families.
Burkitt Lymphoma: The Rare and Aggressive Blood Cancer
Burkitt lymphoma is a fast-growing blood cancer. It is known for its aggressive nature and is often linked to Epstein-Barr virus. Knowing about Burkitt lymphoma is key for early treatment and diagnosis.
Definition and Classification
Burkitt lymphoma is a unique type of non-Hodgkin lymphoma. It is recognized by the World Health Organization as a distinct cancer type. Its classification is based on its appearance, genetic makeup, and how it behaves.
The main features include:
- High proliferation rate: The cancer cells grow quickly, making it aggressive.
- Specific immunophenotype: The cancer cells have specific markers for diagnosis.
- MYC gene translocation: A genetic hallmark of Burkitt lymphoma is the MYC gene translocation, which affects cell growth.
Epidemiology and Prevalence
Burkitt lymphoma is rare worldwide but more common in Africa. It is also found sporadically around the globe. The disease’s spread is linked to Epstein-Barr virus and other risk factors.
Some key facts include:
- The endemic form is mainly found in equatorial Africa.
- Sporadic cases are seen worldwide, with higher rates in certain groups.
- Immunodeficiency-associated Burkitt lymphoma is common in people with weakened immune systems, like those with HIV/AIDS.
Historical Background
Burkitt lymphoma was first identified by Denis Burkitt in the late 1950s. It was found in African children, causing jaw and abdominal tumors. Over time, we’ve learned a lot about its causes, genetics, and how it spreads.
The history of Burkitt lymphoma includes:
- It was first found in African children, leading to the discovery of the endemic form.
- Studies later showed its link to Epstein-Barr virus.
- Thanks to better treatments, survival rates have improved, mainly in wealthier areas.
Types of Burkitt Lymphoma
It’s important to know the different types of Burkitt lymphoma for diagnosis and treatment. There are three main types: endemic, sporadic, and immunodeficiency-associated. Each type has its own clinical and epidemiological features.
Endemic Burkitt Lymphoma (African Lymphoma)
Endemic Burkitt lymphoma is mostly found in equatorial Africa. It’s a common cancer in children there. This type is closely linked to Epstein-Barr Virus (EBV) infection. It often starts in the jaw or abdomen.
- High prevalence in equatorial Africa
- Strong association with EBV infection
- Commonly affects children
Sporadic Burkitt Lymphoma
Sporadic Burkitt lymphoma is found worldwide. It’s less linked to EBV than the endemic type. It often shows up as an abdominal mass and affects children and young adults.
- Global distribution
- Less associated with EBV
- Presents with abdominal masses
Immunodeficiency-Associated Burkitt Lymphoma
This type happens in people with weakened immune systems. This includes those with HIV/AIDS or who have had organ transplants. It’s also linked to EBV infection.
- Occurs in immunodeficient individuals
- Associated with HIV/AIDS and organ transplantation
- Linked to EBV infection
In conclusion, knowing the different types of Burkitt lymphoma is key for accurate diagnosis and treatment. Each type has unique characteristics and epidemiological features. This highlights the need for specific treatment approaches.
Causes and Risk Factors of Burkitt Lymphoma
Burkitt lymphoma is a rare and aggressive blood cancer. It has several risk factors that help it develop. Knowing these factors is key to diagnosing and treating it well.
Epstein-Barr Virus Connection
The Epstein-Barr virus (EBV) is a big risk factor for Burkitt lymphoma. EBV is a herpesvirus that affects over 90% of adults worldwide. Most people don’t show symptoms or have mild illness, but it can cause cancer, including Burkitt lymphoma.
Key Facts about EBV and Burkitt Lymphoma:
- EBV is found in almost all cases of endemic Burkitt lymphoma.
- It may cause genetic changes in B cells, leading to Burkitt lymphoma.
- Malaria infection can increase the risk of Burkitt lymphoma in people with EBV.
MYC Gene Translocation
The MYC gene’s translocation is another key factor in Burkitt lymphoma. This genetic change involves the MYC gene on chromosome 8 and an immunoglobulin gene on chromosomes 2, 14, or 22. It leads to too much MYC protein, making lymphoma cells grow fast.
The MYC gene translocation is a hallmark of Burkitt lymphoma, making it different from other lymphomas. This genetic change is found in almost all Burkitt lymphoma cases, making it a key diagnostic sign.
Other Risk Factors
While EBV and MYC gene translocation are major risk factors, other factors might also play a role. These include:
| Risk Factor | Description |
| Immunodeficiency | People with weakened immune systems, like those with HIV/AIDS, are at higher risk of Burkitt lymphoma. |
| Genetic Predisposition | Some genetic mutations might increase the risk of Burkitt lymphoma, though more research is needed. |
| Environmental Factors | Exposure to certain toxins or infections might also raise the risk of Burkitt lymphoma. |
As research goes on, we learn more about the complex factors that lead to Burkitt lymphoma. This includes genetics, environment, and infections.
Understanding Burkitt lymphoma’s causes and risk factors is vital for better prevention and treatment. By studying these factors, we can help patients with this tough disease.
Symptoms and Clinical Presentation of Burkitt Lymphoma
Burkitt lymphoma is a rare and aggressive blood cancer. It shows different symptoms based on where the disease is and its type. Knowing these symptoms is key for early diagnosis and treatment.
Common Symptoms
The symptoms of Burkitt lymphoma can vary. But, some signs are seen often. These include:
- Rapidly enlarging lymph nodes: Often one of the first signs, lymph node enlargement can occur in the neck, abdomen, or other areas.
- Abdominal pain or swelling: Many patients experience abdominal symptoms due to tumor growth.
- Fever: Unexplained fever can be a symptom, often accompanied by night sweats and weight loss.
- Fatigue: Feeling extremely weak or tired is common.
These symptoms can be similar to other illnesses. This makes early diagnosis hard.
Differences in Symptom Presentation by Type
The symptoms can differ based on the type of Burkitt lymphoma:
| Type of Burkitt Lymphoma | Common Symptoms |
| Endemic Burkitt Lymphoma | Often presents with jaw or facial bone tumors. |
| Sporadic Burkitt Lymphoma | Typically involves abdominal symptoms, such as pain or swelling. |
| Immunodeficiency-Associated Burkitt Lymphoma | May present with lymph node enlargement and systemic symptoms like fever and weight loss. |
Understanding these differences is essential for healthcare providers to make an accurate diagnosis.
When to Seek Medical Attention

If you or someone you know is experiencing symptoms that could be indicative of Burkitt lymphoma, it’s important to seek medical attention quickly. Early diagnosis and treatment can greatly improve outcomes.
We recommend consulting a healthcare professional if you notice:
- Unexplained lymph node enlargement.
- Persistent or severe abdominal pain.
- Unexplained fever, night sweats, or weight loss.
Prompt evaluation and diagnosis are key to managing Burkitt lymphoma effectively.
Diagnosis of Burkitt Lymphoma
Diagnosing Burkitt lymphoma requires a mix of clinical checks and advanced tests. We use a detailed method to confirm the diagnosis, find out the stage, and classify the disease.
Diagnostic Procedures
Several key procedures help diagnose Burkitt lymphoma. These include:
- Biopsy: A biopsy is the main tool, where a tissue sample is checked for cancer cells.
- Imaging Studies: Tests like CT scans, MRI, and PET scans show how far the disease has spread.
- Blood Tests: Blood tests look for abnormal cells and check overall health.
- Bone Marrow Aspiration and Biopsy: These tests check if the cancer has reached the bone marrow.
Staging and Classification
After diagnosing Burkitt lymphoma, we stage and classify it. Staging checks if the cancer is in one area or has spread. The staging system helps plan treatment and predict outcomes.
Differential Diagnosis
Differential diagnosis is key to tell Burkitt lymphoma apart from other lymphomas and cancers. We use clinical findings, lab tests, and imaging to make this distinction. Accurate differential diagnosis ensures the right treatment for patients.
We know diagnosing Burkitt lymphoma can be tough. But with modern diagnostic tools and a thorough approach, we can give an accurate diagnosis and create a good treatment plan.
Treatment Approaches for Burkitt Lymphoma
Treatment for Burkitt lymphoma is complex. It often includes chemotherapy, targeted therapies, and supportive care. Starting treatment quickly is very important because of the disease’s aggressive nature.
Chemotherapy Protocols
Chemotherapy is key in treating Burkitt lymphoma. Doctors use strong, multi-agent chemotherapy to quickly reduce cancer cells. This helps improve survival chances. Some common treatments are:
- CODOX-M: This includes cyclophosphamide, doxorubicin, vincristine, methotrexate, and leucovorin.
- Hyper-CVAD: It alternates between hyperfractionated cyclophosphamide, vincristine, doxorubicin, and dexamethasone, and high-dose methotrexate and cytarabine.
Targeted Therapies
Targeted therapies are also being used to make treatments better and safer. Rituximab, a monoclonal antibody, has shown great benefits when added to chemotherapy.
Stem Cell Transplantation
Stem cell transplantation is an option for some patients, like those with relapsed or refractory disease. This process involves:
- High-dose chemotherapy to kill the lymphoma.
- Infusing stem cells to rebuild the bone marrow.
Supportive Care
Supportive care is vital in treating Burkitt lymphoma. It helps manage side effects and improves quality of life. This includes:
- Tumor lysis syndrome management: Preventing this dangerous complication with early measures and monitoring.
- Infection prophylaxis: Using antimicrobial agents to prevent infections when the immune system is weak.
By combining these treatments, we can better help patients with Burkitt lymphoma. Research and clinical trials are ongoing. They aim to improve treatment options and offer hope for the future.
Comparing Rare Blood Cancers: Which is the Rarest?
Rare blood cancers are a big challenge for doctors. They come in many types, each with its own numbers and who it affects. Knowing how rare each one is helps doctors diagnose, treat, and study these cancers.
Incidence Rates of Rare Blood Cancers
The numbers of rare blood cancers differ a lot. For example, Burkitt lymphoma is very aggressive but not as common as other lymphomas. We look at these numbers to see which cancers are the rarest.
Here are some rare blood cancers and how often they happen per million people:
| Type of Cancer | Annual Incidence Rate (per million) |
| Burkitt Lymphoma | 2-3 |
| Waldenstrom Macroglobulinemia | 3-4 |
| Anaplastic Large Cell Lymphoma | 1-2 |
| Mantle Cell Lymphoma | 6-7 |
Geographical Distribution
Where rare blood cancers are found also varies. Some cancers are more common in certain areas because of genetics, environment, or viruses. For example, Burkitt lymphoma is mostly found in Africa, linked to a virus and malaria.
Age and Demographic Factors
Age and who gets these cancers are also important. Some cancers hit kids, while others mostly affect adults or the elderly. Knowing this helps doctors focus their research and treatments.
Burkitt lymphoma often affects kids, mainly in Africa. On the other hand, Waldenstrom macroglobulinemia usually happens in older adults.
By looking at how common these cancers are, where they are found, and who gets them, we learn which ones are the rarest. This information is key for improving research and treatments.
Central Nervous System (CNS) Lymphoma
CNS lymphoma is a rare cancer that affects the brain and spinal cord. It can start in the CNS or spread from other parts of the body. This type of lymphoma is known as non-Hodgkin lymphoma.
Primary vs. Secondary CNS Lymphoma
It’s important to know if CNS lymphoma is primary or secondary. Primary CNS lymphoma (PCNSL) starts in the CNS. It is aggressive. Secondary CNS lymphoma spreads to the CNS from other areas. This affects treatment and prognosis.
Symptoms and Diagnosis
Symptoms of CNS lymphoma vary. They can include neurological problems, changes in thinking, and vision issues. To diagnose, we use MRI and examine tissue samples.
The diagnostic process includes:
- Imaging studies (MRI, CT scans)
- Lumbar puncture to examine cerebrospinal fluid
- Biopsy of the affected area
- Ophthalmological examination for ocular involvement
Treatment Approaches
Treatment for CNS lymphoma depends on several factors. Chemotherapy and radiation therapy are common. Sometimes, high-dose chemotherapy followed by stem cell transplantation is used. We customize treatment to each patient’s needs.
Prognosis and Outcomes
The prognosis for CNS lymphoma varies. It depends on the type, treatment response, and patient’s health. Primary CNS lymphoma has a poorer prognosis. But, treatment has improved outcomes. We provide personalized care and support.
Key factors influencing prognosis include:
- Response to initial treatment
- Age and overall health of the patient
- Presence of any comorbid conditions
Waldenstrom Macroglobulinemia
Waldenstrom Macroglobulinemia is a rare lymphoma that poses unique challenges. It’s marked by an overproduction of IgM antibodies due to lymphoplasmacytic cells in the bone marrow. This condition is also known as lymphoplasmacytic lymphoma.
Understanding Lymphoplasmacytic Lymphoma
Lymphoplasmacytic lymphoma is a non-Hodgkin lymphoma. It involves the growth of lymphoplasmacytic cells, a type of B cell. These cells build up in the bone marrow, spleen, and lymph nodes, causing symptoms.
The exact cause of Waldenstrom Macroglobulinemia is not known. It’s thought to be due to genetics and environment. Some genetic mutations may increase the risk.
Symptoms and Diagnosis
Symptoms of Waldenstrom Macroglobulinemia vary. Common ones include fatigue, weight loss, and infections. Some may also have neurological symptoms due to high IgM antibodies.
To diagnose Waldenstrom Macroglobulinemia, doctors use clinical evaluation, lab tests, and bone marrow biopsy. They look for lymphoplasmacytic cells and IgM monoclonal protein in the blood.
Treatment Options
Treatment for Waldenstrom Macroglobulinemia varies. It may include watchful waiting, chemotherapy, targeted therapy, and plasmapheresis. The choice depends on symptoms, health, and disease characteristics.
Recent advances in targeted therapies have helped many patients. These therapies target molecules that help lymphoma cells grow and survive.
Long-term Management
Managing Waldenstrom Macroglobulinemia long-term involves regular monitoring and symptom management. Treatment may need to be adjusted over time. Patients often need support to cope with the disease’s physical and emotional effects.
We know living with Waldenstrom Macroglobulinemia is tough. Our healthcare team is dedicated to providing care and support. We aim to help patients manage this complex condition.
Anaplastic Large Cell Lymphoma (ALCL)
Understanding Anaplastic Large Cell Lymphoma (ALCL) is key for doctors and patients. It’s a rare but important type of lymphoma. ALCL has unique features and symptoms, making it different from other lymphomas.
Types and Classification
ALCL has different subtypes based on genetics and behavior. The main types are systemic ALCL and primary cutaneous ALCL. Each type has its own traits and outlook.
“The way we classify ALCL has changed a lot,” says a hematopathology expert. “We now know more about its molecular pathogenesis.”
Symptoms and Diagnosis
ALCL symptoms vary by subtype and disease extent. Symptoms include swollen lymph nodes, fever, weight loss, and skin lesions. Doctors use clinical signs, tissue exams, and tests to diagnose it.
Getting the right diagnosis quickly is key for treatment. “A correct and timely diagnosis is vital for managing ALCL,” a specialist stresses.
Treatment Approaches
Treatment for ALCL depends on the type and stage. Systemic ALCL often gets chemotherapy and targeted therapy for ALK-positive cases. Primary cutaneous ALCL might get skin treatments or systemic therapy.
- Chemotherapy plans based on ALCL subtype
- Targeted therapy for ALK-positive ALCL
- Skin treatments for primary cutaneous ALCL
Recent Advances
New discoveries in ALCL have improved diagnosis and treatment. Research has found new targets for therapy. This could lead to better, less harmful treatments.
New therapies are being tested in clinical trials. These include targeted agents and immunotherapies.
Mantle Cell Lymphoma
Mantle cell lymphoma is a rare and complex blood cancer. It needs a careful approach to diagnosis and treatment. This type of non-Hodgkin lymphoma has unique features and can be challenging to diagnose.
Characteristics and Classification
Mantle cell lymphoma is known for specific cancer cells in the lymph node’s mantle zone. It often has a genetic change, t(11;14), leading to too much cyclin D1.
Key Characteristics:
- Presence of lymphoma cells in the mantle zone
- t(11;14) genetic translocation
- Overexpression of cyclin D1
Understanding the different types and stages of mantle cell lymphoma is key. Accurate classification helps choose the best treatment.
Symptoms and Presentation
Symptoms of mantle cell lymphoma vary among patients. Common signs include:
- Swollen lymph nodes
- Fatigue
- Weight loss
- Fever
In some cases, the disease affects the stomach, causing more symptoms. This shows the need for a detailed diagnostic process.
Diagnostic Approaches
Diagnosing mantle cell lymphoma requires imaging, biopsy, and genetic tests. Finding the t(11;14) translocation and cyclin D1 overexpression confirms the diagnosis.
| Diagnostic Method | Purpose |
| Imaging Studies (e.g., CT scans) | Assess the extent of disease |
| Biopsy | Examine tissue for lymphoma cells |
| Molecular Genetic Testing | Detect t(11;14) translocation and cyclin D1 overexpression |
Treatment Strategies
Treatment for mantle cell lymphoma varies based on several factors. These include the disease stage, patient age, and overall health. Common treatments are:
- Chemotherapy
- Targeted therapy
- Stem cell transplantation
- Maintenance therapy
New treatments have improved outcomes for many. Ongoing research aims to find even better ways to treat this disease.
Bone Marrow Cancers and Malignancies
The bone marrow is key to our blood production. It can get affected by cancers and malignancies. These issues can harm our blood production and health.
Types of Bone Marrow Cancers
There are several types of bone marrow cancers. These include leukemia, lymphoma, and multiple myeloma. Each type affects the body in different ways.
- Leukemia: A cancer of the blood and bone marrow. It’s marked by fast growth of abnormal white blood cells.
- Lymphoma: Starts in the lymph system, part of our immune system. It’s a cancer of the lymph cells.
- Multiple Myeloma: Affects plasma cells in the bone marrow. It can cause anemia, bone pain, and infections.
Diagnosis and Detection
Diagnosing bone marrow cancers requires several tests. These include blood tests, bone marrow biopsy, and imaging studies. Finding cancer early is key to effective treatment.
| Diagnostic Test | Purpose |
| Blood Tests | To check for abnormal blood cells or proteins. |
| Bone Marrow Biopsy | To look for cancer cells in the bone marrow. |
| Imaging Studies | To see how far the disease has spread. |
Treatment Options
Treatment for bone marrow cancers varies. It depends on the type, stage, and patient’s health. Options include chemotherapy, targeted therapy, radiation therapy, and stem cell transplantation.
- Chemotherapy: Uses drugs to kill cancer cells.
- Targeted Therapy: Targets specific cancer cell mechanisms.
- Radiation Therapy: Kills cancer cells with high-energy rays.
- Stem Cell Transplantation: Replaces damaged stem cells with healthy ones.
Impact on Blood Production
Bone marrow cancers can disrupt blood cell production. This can lead to anemia, infections, and bleeding disorders. Managing these effects is a key part of treatment.
Understanding bone marrow cancers and malignancies is vital. We’re always learning more and improving treatments. This gives hope to those affected by these conditions.
Polycythemia Vera: A Rare Blood Disorder
Polycythemia vera is a rare blood disorder. It causes too many red blood cells, leading to serious health issues. It’s a type of myeloproliferative neoplasm (MPN).
Understanding the Nature of Polycythemia Vera
Many wonder if PV is cancer. It’s not a traditional cancer but a myeloproliferative neoplasm. This means cells in the bone marrow grow too much. It leads to too many red and white blood cells and platelets.
Recognizing Symptoms and Complications
Symptoms of PV vary but often include headaches and dizziness. Itching, often after a warm bath, is common too. Serious problems like blood clots can happen, causing strokes or heart attacks. Early diagnosis and treatment are key to avoid these risks.
Managing and Treating Polycythemia Vera
Treating PV aims to lower the risk of serious problems. This might include phlebotomy to reduce red blood cells. Medications to slow blood cell production and other treatments are also used. Regular check-ups are vital to adjust treatments and manage side effects.
Assessing the Risk of Progression to Leukemia
People with PV worry about turning into leukemia. While it’s a risk, it’s low with proper care. Knowing this risk helps in making treatment choices.
Managing PV requires a full approach to care. Understanding the condition, its symptoms, and treatment options helps. This way, people can better manage their health and lower the risk of complications.
Conclusion: Advances in Understanding and Treating Rare Blood Cancers
Medical research has made big strides in understanding and treating rare blood cancers. This includes diseases like Burkitt lymphoma and others. We’ve looked into how these diseases work, from who gets them to how they’re treated.
Studies on lymphoma have brought us new treatments and better ways to use chemotherapy. This has helped patients live better lives. We need to keep funding research to keep making progress.
We must also spread the word about rare blood cancers. Supporting research helps us find better ways to diagnose and treat these diseases. This way, we can help more patients.
We’re committed to top-notch healthcare and support for patients from around the world. We’re focused on finding new ways to treat rare blood cancers. Our goal is to give patients the best care possible.
FAQ
What is Burkitt lymphoma?
Burkitt lymphoma is a rare and aggressive cancer. It grows quickly and has a high cell division rate.
What are the different types of Burkitt lymphoma?
There are three main types of Burkitt lymphoma. These are endemic, sporadic, and immunodeficiency-associated Burkitt lymphoma.
What is the role of Epstein-Barr virus in Burkitt lymphoma?
Epstein-Barr virus is linked to Burkitt lymphoma, mainly in endemic cases. It’s believed to help cause the disease.
What are the symptoms of Burkitt lymphoma?
Symptoms vary by type and location. Common signs include abdominal pain, swelling, and weight loss.
How is Burkitt lymphoma diagnosed?
Diagnosis involves imaging, biopsy, and lab tests. These include flow cytometry and molecular analysis.
What is the treatment for Burkitt lymphoma?
Treatment includes intensive chemotherapy. Sometimes, targeted therapies and stem cell transplantation are used too.
What is Waldenstrom macroglobulinemia?
Waldenstrom macroglobulinemia is a rare lymphoma. It causes excessive IgM antibody production. Symptoms include fatigue, weakness, and bleeding.
What is Anaplastic Large Cell Lymphoma (ALCL)?
ALCL is a rare lymphoma. It can be systemic or cutaneous. It’s known for large, anaplastic cells.
What is Mantle Cell Lymphoma?
Mantle cell lymphoma is rare. It affects the mantle zone of lymph nodes. It often has a poor prognosis.
Is Polycythemia Vera a cancer?
Polycythemia vera is a rare blood disorder. It’s not usually called a cancer. But, it can raise the risk of leukemia.
What is Central Nervous System (CNS) Lymphoma?
CNS lymphoma is rare. It occurs in the brain or spinal cord. Symptoms include neurological deficits and cognitive issues.
What are the treatment options for rare blood cancers?
Treatment varies by disease type and stage. Options include chemotherapy, targeted therapies, stem cell transplantation, and supportive care.
References
Wang, Y., et al. (2024). Global, regional, and national burden of Burkitt lymphoma: Epidemiology and trends. Blood Cancer Journal.