ON THIS PAGE: You will find some basic information about this disease and the parts of the body it may affect. This is the first page of Cancer.Net’s Guide to Hodgkin Lymphoma. To see other pages, use the colored boxes on the right side of your screen. Think of those boxes as a roadmap to this full guide. Or, click “Next” at the bottom of each page.
Hodgkin lymphoma, also called Hodgkin’s disease, is one category of lymphoma, a cancer of the lymphatic system. Lymphoma begins when cells in the lymphatic system change and grow uncontrollably, which may form a tumor, involve many parts of the lymphatic system, or spread to other parts of the body.
About the lymphatic system
The lymphatic system is made up of thin tubes that branch out to all parts of the body. Its job is to fight infection and disease. The lymphatic system carries lymph, a colorless fluid containing lymphocytes (a type of white blood cell). Lymphocytes are part of our immune system and help fight germs in the body. B-lymphocytes (also called B cells) make antibodies to fight bacteria, and T-lymphocytes (also called T cells) kill viruses and foreign cells and trigger the B cells to make antibodies.
Groups of bean-shaped organs called lymph nodes are located throughout the body at different areas in the lymphatic system. Lymph nodes are found in clusters in the abdomen, groin, pelvis, underarms, and neck. Other parts of the lymphatic system include the spleen, which makes lymphocytes and filters the blood; the thymus, an organ under the breastbone; and the tonsils, which are located in the throat.
Hodgkin lymphoma most commonly affects lymph nodes in the neck or the area between the lungs and behind the breastbone. It can also begin in groups of lymph nodes under an arm, in the groin, or in the abdomen or pelvis.
If Hodgkin lymphoma spreads, it may spread to the spleen, liver, bone marrow, or bone. Spread to other parts of the body can also occur, but it is unusual.
Types of Hodgkin lymphoma
There are different types of Hodgkin lymphoma. It is important to know the type, as this may affect the choice of treatment. Doctors determine the type of Hodgkin lymphoma based on how the cells in a tissue sample look under a microscope and whether the cells contain certain abnormal proteins.
The American Joint Committee on Cancer (AJCC) recognizes these major categories of Hodgkin lymphoma:
Classical Hodgkin lymphoma. Classical Hodgkin lymphoma (CHL) is diagnosed when characteristic abnormal lymphocytes, known as Reed-Sternberg cells, are found. CHL can be divided into four different subtypes:
- Nodular sclerosis Hodgkin lymphoma: Nodular sclerosis Hodgkin lymphoma is the most common form of CHL, affecting up to 80% of people diagnosed with CHL. It is most common in young adults, especially women. In addition to Reed-Sternberg cells, there are bands of connective tissue in the lymph node. This type of lymphoma often involves the lymph nodes in the mediastinum (chest).
- Lymphocyte-rich classical Hodgkin lymphoma: About 6% of people with CHL have this subtype. It is more common in men and usually involves areas other than the mediastinum. The tissue contains many normal lymphocytes, in addition to Reed-Sternberg cells.
- Mixed cellularity Hodgkin lymphoma: This subtype of lymphoma occurs in older adults and, commonly, in the abdomen. It carries many different cell types, including large numbers of Reed-Sternberg cells.
- Lymphocyte-depleted Hodgkin lymphoma: Lymphocyte-depleted Hodgkin lymphoma is the least common subtype of CHL, and about 1% of people with CHL have this form. It is most common in older adults, people with the human immunodeficiency virus (HIV, the virus that causes autoimmune deficiency syndrome or AIDS), and people in non-industrialized countries. The lymph node contains almost all Reed-Sternberg cells.
There is another type of Hodgkin lymphoma that is not a part of the CHL group. Instead, it is more similar at the protein and genetic level to B-cell non-Hodgkin lymphoma.
Nodular lymphocyte-predominant Hodgkin lymphoma. About 5% of people with Hodgkin lymphoma have nodular lymphocyte-predominant Hodgkin lymphoma, which is often found in the lymph nodes in the neck or groin. It is most common in younger patients. People with this type of Hodgkin lymphoma not only have Reed-Sternberg cells, but a marker called “CD20” on the surface of the lymphoma cells as well. CD20 is a protein that is usually found in people diagnosed with B-cell non-Hodgkin lymphoma.
Nodular lymphocyte-predominant Hodgkin lymphoma is often treated differently than CHL. Some people with nodular lymphocyte-predominant Hodgkin lymphoma do not need treatment right away, while others may benefit from a treatment plan that includes radiation therapy or a limited amount of chemotherapy combined with radiation therapy. Patients with this type of lymphoma tend to have a very good prognosis (chance of recovery). However, a small number of patients with nodular lymphocyte-predominant Hodgkin lymphoma may develop a more aggressive type of non-Hodgkin lymphoma called diffuse large B-cell lymphoma.
Looking for More of an Overview?
If you would like additional introductory information, explore the following items. Please note these links take you to other sections on Cancer.Net:
- Cancer.Net Patient Education Video: View a short video led by an ASCO expert in lymphoma that provides basic information and areas of research.
- Cancer.Net En Español: Read about Hodgkin lymphoma in Spanish. Infórmase sobre linfoma de Hodgkin en español.
Or, choose “Next” (below, right) to continue reading this detailed section. To select a specific topic within this section, use the colored boxes located on the right side of your screen.