Follicular Lymphoma - Causes, Symptoms, Diagnosis, and Treatment

What Is Follicular Lymphoma?

Follicular lymphoma is a slow-growing type of non-Hodgkin lymphoma that develops from B lymphocytes, a type of white blood cell. It usually begins in the lymph nodes and may spread to the bone marrow, spleen, or other organs. Common symptoms include painless swollen lymph nodes, fatigue, fever, night sweats, and unexplained weight loss, although some individuals may not notice symptoms early on.

Follicular lymphoma is considered a chronic but manageable condition, and many individuals live with it for decades. Modern treatments have greatly improved survival and quality of life. It is the second most common form of non-Hodgkin lymphoma, with about 15,000 to 20,000 new cases diagnosed annually in the United States. The condition mainly affects adults over 60 years of age.

What Causes Follicular Lymphoma?

The exact cause of follicular lymphoma is still unknown. It is not usually inherited and does not commonly run in families. Researchers believe that changes in the DNA (Deoxyribonucleic acid) of white blood cells play an important role in the development of this cancer.

A genetic change called chromosomal translocation is often linked to follicular lymphoma. In this process, parts of chromosomes 14 and 18 exchange places. This causes overproduction of a protein called BCL-2 (B-cell lymphoma 2), which prevents abnormal cells from dying naturally.

Certain factors may increase the risk of developing follicular lymphoma. These include:

• Increasing age.

• Weak immune system.

• Exposure to pesticides or industrial chemicals.

• Autoimmune diseases.

• Certain infections.

However, many individuals diagnosed with follicular lymphoma may not have any known risk factors.

What Are the Types of Follicular Lymphoma?

Follicular lymphoma has different subtypes. These subtypes behave differently and may require different treatments.

• Classic Follicular Lymphoma: This is the most common type. It usually grows slowly and responds well to treatment.

• Pediatric-Type Follicular Lymphoma: This type occurs in children and young adults. It behaves very differently from the adult form. Doctors often consider it a separate disease because it is usually localized and highly curable.

• In Situ Follicular B-Cell Neoplasm: This is an early abnormal change found in lymph nodes. It may not always develop into active lymphoma.

• Duodenal-Type Follicular Lymphoma: This rare type mainly affects the small intestine, especially the duodenum. It often grows slowly.

What Are the Symptoms of Follicular Lymphoma?

Many individuals do not notice symptoms during the early stages. The disease is often found accidentally during routine tests or scans.

Common symptoms include:

• Swollen lymph nodes (painless swelling in the neck, groin, armpits, or abdomen) are the most common symptom.

• Fever (persistent low-grade fever without infection may occur).

• Night sweats (heavy sweating during sleep is common in lymphoma).

• Fatigue.

• Weight loss (losing more than 10 % of body weight within six months) can be a warning sign.

• Chills and frequent infections (Some individuals develop repeated infections because the immune system becomes weak).

• Abdominal fullness (enlarged lymph nodes or spleen may create pressure in the abdomen).

How Is Follicular Lymphoma Diagnosed?

Doctors use several tests to confirm follicular lymphoma and determine its stage.

• Biopsy: A lymph node biopsy is the most important test. A tissue sample is removed and examined under a microscope to detect cancer cells.

• Blood Tests: Blood tests help evaluate overall health, blood cell counts, and organ function.

• CT Scan: Computed tomography scans help locate enlarged lymph nodes and assess disease spread.

• PET Scan: Positron emission tomography scans identify active cancer areas in the body.

• Bone Marrow Biopsy: This test checks whether the lymphoma has spread to the bone marrow.

What Are the Grades and Stages of Follicular Lymphoma?

Follicular lymphoma is classified by both stage and grade.

Grades of Follicular Lymphoma

• Grades 1, 2, and 3A are considered low-grade or slow-growing lymphomas.

• Grade 3B behaves more aggressively and is often treated like diffuse large B-cell lymphoma.

The grade depends on how the cancer cells appear under the microscope.

Stages of Follicular Lymphoma

• Stage I: The lymphoma is found in one lymph node area.

• Stage II: Two or more lymph node regions are affected on the same side of the diaphragm.

• Stage III: Lymph nodes on both sides of the diaphragm are involved.

• Stage IV: The disease has spread to organs such as the bone marrow, liver, or lungs.

Many individuals are diagnosed at stage III or IV because the disease grows slowly and may remain unnoticed for years.

What Is FLIPI?

FLIPI stands for Follicular Lymphoma International Prognostic Index. Doctors use this scoring system to predict disease outcome and plan treatment.

The FLIPI score is based on factors such as:

• Age above 60 years.

• Stage III or IV disease.

• Low hemoglobin levels.

• High number of lymph node areas involved.

• Elevated LDH blood levels.

How Is Follicular Lymphoma Treated?

Treatment depends on the stage, symptoms, age, and overall health of the individual.

• Some individuals do not need immediate treatment. Doctors closely monitor the condition with regular tests and scans. This approach is called active surveillance or watchful waiting.

• Radiation therapy may be used in early-stage disease. High-energy rays destroy cancer cells in affected lymph nodes.

• Drugs such as Rituximab and Obinutuzumab target lymphoma cells specifically.

Chemotherapy

Several chemotherapy regimens are commonly used, including:

• R-CHOP - Rituximab, Cyclophosphamide, Hydroxydaunorubicin (Doxorubicin), Vincristine (Oncovin), and Prednisone.

• O-CHOP - Obinutuzumab, Cyclophosphamide, Hydroxydaunorubicin (Doxorubicin), Vincristine (Oncovin), and Prednisone.

• CVP - Cyclophosphamide, Vincristine, and Prednisone.

• Bendamustine with Rituximab.

• Chlorambucil.

These medicines help destroy cancer cells and control the spread of the disease.

• Maintenance Therapy: After successful treatment, some individuals receive maintenance therapy with Rituximab or Obinutuzumab for up to two years. This helps delay relapse.

• Immunotherapy: Immunotherapy strengthens the immune system to fight cancer cells more effectively.

• Targeted Therapy: Targeted drugs attack specific proteins inside lymphoma cells while causing less damage to healthy cells.

• CAR-T Cell Therapy: CAR-T cell therapy is a newer treatment option for relapsed or difficult-to-treat follicular lymphoma. In this treatment, the patient’s immune cells are modified to attack cancer cells.

• Bispecific Antibody Therapy: New drugs such as epcoritamab help immune cells directly target lymphoma cells. These medicines are mainly used in relapsed disease.

• Bone Marrow or Stem Cell Transplant: Stem cell transplant may be recommended in recurrent or aggressive cases.

What Are the Possible Treatment Complications?

Treatment for follicular lymphoma may cause side effects and complications.

• Tumor Lysis Syndrome: Rapid destruction of cancer cells can release harmful substances into the blood.

• Low Blood Counts: Chemotherapy may reduce white blood cells, red blood cells, and platelets.

• Hepatitis B or C Reactivation: Certain treatments can reactivate old viral infections.

• Bone Weakness: Long-term steroid use may reduce bone density.

• Medication Toxicity: Some cancer drugs may affect the heart, nerves, or kidneys.

Doctors monitor individuals carefully during treatment to manage these complications early.

Can Follicular Lymphoma Return?

Yes. Follicular lymphoma has a high relapse rate. The disease may return months or years after successful treatment. However, many relapses can still be treated effectively.

In some cases, follicular lymphoma may transform into a faster-growing lymphoma called diffuse large B-cell lymphoma. This transformation occurs in a small percentage of individuals and usually requires more intensive treatment.

Conclusion

Follicular lymphoma is a slow-growing type of non-Hodgkin lymphoma that affects white blood cells and lymph nodes. Although it is considered a chronic cancer, many individuals live long and active lives with proper treatment and monitoring.

Modern therapies such as monoclonal antibodies, CAR-T cell therapy, targeted therapy, and maintenance treatment have improved survival significantly. Early diagnosis, regular follow-up, and timely treatment can help control the disease and improve quality of life. To know more about this, consult a cancer specialist.

Key Takeaway:

• Follicular lymphoma is a slow-growing type of non-Hodgkin lymphoma. It affects B lymphocytes. It accounts for nearly 20 % of all non-Hodgkin lymphoma cases worldwide.

• Common symptoms include painless swollen lymph nodes, fatigue, fever, night sweats, and unexplained weight loss. Around 80 % of individuals are diagnosed in advanced stages because symptoms develop slowly.

• The condition is usually chronic and manageable. Nearly 9 out of 10 individuals survive for at least five years after diagnosis. Many individuals live for more than 15 to 20 years.

• Early diagnosis and proper treatment help control symptoms and slow disease progression. Treatment response rates are high in early-stage disease.

• Modern therapies such as monoclonal antibodies, targeted therapy, CAR-T cell therapy, and maintenance treatment have improved survival rates and quality of life.