What is non-Hodgkin's lymphoma (NHL)?
Non-Hodgkin's lymphoma is cancer in the lymphatic system. Sixty percent of lymphomas are non-Hodgkin's lymphomas. The lymphatic system is part of the immune system and functions to fight disease and infections.
The lymphatic system includes the following:
- lymph fluid - fluid containing lymphocyte cells.
- lymph vessels - thin tubes that carry lymph fluid throughout the body.
- lymphocytes - specific white blood cells that fight infections and disease.
- lymph nodes - bean-shaped organs, found in the underarm, groin, neck, chest, and abdomen, that act as filters for the lymph fluid as it circulates through the body.
Non-Hodgkin's lymphoma causes the cells in the lymphatic system to abnormally reproduce, eventually causing tumors to grow. Non-Hodgkin's disease cells can also spread to other organs and tissues in the body.
Lymphomas are the third most common childhood cancer. They occur most often in children between the ages of 7 and 11, but can occur at any age from infancy to adulthood.
Non-Hodgkin's lymphoma affects males more often than females, and is more common among Caucasian children than among African-American children and children of other races.
Staging and classification of non-Hodgkin's lymphoma is based on the extent of the disease and the specific cells involved.
What are the different types of non-Hodgkin's lymphoma?
There are three subtypes of non-Hodgkin's lymphoma, including the following:
- lymphoblastic non-Hodgkin's lymphoma
Lymphoblastic non-Hodgkin's lymphoma accounts for about 30 percent of the cases, involves the T-cells, and usually presents with a mass in the chest, swollen lymph node(s), with or without bone marrow and central nervous system involvement.
- Burkitt's or non-Burkitt's lymphoma
Burkitt's or non-Burkitt's lymphoma is a non-Hodgkin's disease in which the cells are undifferentiated and diffuse. This has also been referred to as small non-cleaved cells. Burkitt's and non-Burkitt's lymphoma accounts for about 40 to 50 percent of the cases and is usually characterized by a large abdominal tumor and may have bone marrow and central nervous system involvement.
- large cell or diffuse histiocytic non-Hodgkin's lymphoma
Large cell or diffuse histiocytic non-Hodgkin's involves the B-cells and T-cells and accounts for about 25 percent of the cases. Children with this type of non-Hodgkin's lymphoma usually have lymphatic system involvement, as well as a non-lymph structure (i.e., lung, jaw, brain, skin, and bone) involvement.
How is non-Hodgkin's lymphoma staged?
Staging is the process of determining whether cancer has spread and, if so, how far. There are various staging symptoms that are used for non-Hodgkin's lymphoma. Always consult your child's physician for information on staging. One method of staging non-Hodgkin's lymphoma is the following:
- stage I - involves the tumor at one site, either nodal or elsewhere in the body.
- stage II - involves the tumor at two or more sites on the same side of the body.
- stage III - involves tumors in any number that occur on both sides of the body, but does not involve bone marrow or the central nervous system.
- stage IV - any stage of tumor that also has bone marrow and/or central nervous system involvement. Stage IV is also subdivided depending on the amount of blasts (cancer cells) present in the bone marrow.
What causes non-Hodgkin's lymphoma?
The specific cause of non-Hodgkin's lymphoma is unclear. It is possible that genetics and exposure to viral infections may increase the risk for developing this malignancy. Non-Hodgkin's lymphoma has also been linked to chemotherapy and radiation therapy. Non-Hodgkin's may be a second malignancy as a result of the treatment for certain cancers.
There has been much investigation into the association of the Epstein-Barr virus (EBV) that causes the mononucleosis infection; as well as the human immunodeficiency virus (HIV), which causes acquired immune deficiency syndrome (AIDS). Both of these infectious viruses have been linked to the development of Burkitt's lymphoma.
The majority of Burkitt's lymphoma cases result from a chromosome rearrangement between chromosome #8 and #14, which causes genes to change positions and function differently, promoting uncontrolled cell growth. Other chromosome rearrangements have been seen in non-Hodgkin's lymphoma (all types) that are also thought to promote excessive cell growth.
Children and adults with other hereditary abnormalities have an increased risk of developing non-Hodgkin's lymphoma, including patients with ataxia telangiectasia, X-linked lymphoproliferative disease, or Wiskott-Aldrich syndrome.
What are the symptoms of non-Hodgkin's lymphoma?
Most children have stage III or IV disease at the time of diagnosis because of the sudden onset of symptoms. The disease can progress quickly from a few days to a few weeks. A child can go from otherwise healthy to having multi-system involvement in a short time period.
Some children with non-Hodgkin's lymphoma have symptoms of an abdominal mass and have complaints of abdominal pain, fever, constipation, and decreased appetite - due to the pressure and obstruction a large tumor in this area can cause.
Some children with non-Hodgkin's lymphoma have symptoms of a mass in their chest and have complaints of respiratory problems, pain with deep breaths (dyspnea), cough, and/or wheezing.
Because of the rapid onset of this malignancy, any respiratory symptoms can quickly worsen, causing a life-threatening emergency.
The following are the most common symptoms of non-Hodgkin's lymphoma. However, each child may experience the symptoms differently. Symptoms may include:
- painless swelling of the lymph nodes in neck, chest, abdomen, underarm, or groin
- sore throat
- fullness in groin area from node involvement
- bone and joint pain
- night sweats
- tiring easily (fatigue)
- weight loss/decreased appetite
- itching of the skin
- recurring infections
The symptoms of non-Hodgkin's lymphoma may resemble other blood disorders or medical problems. Always consult your child's physician for a diagnosis.
How is non-Hodgkin's lymphoma diagnosed?
In addition to a complete medical history and physical examination, diagnostic procedures for non-Hodgkin's lymphoma may include:
- blood and urine tests
- x-rays of the chest - use invisible electromagnetic energy beams to produce images of internal tissues, bones, and organs onto film.
- computed tomography scan of the abdomen, chest, and pelvis (Also called a CT or CAT scan.) - a diagnostic imaging procedure that uses a combination of x-rays and computer technology to produce cross-sectional images (often called slices), both horizontally and vertically, of the body. A CT scan shows detailed images of any part of the body, including the bones, muscles, fat, and organs. CT scans are more detailed than general x-rays.
- positron emission tomography (PET) scan - radioactive-tagged glucose (sugar) is injected into the bloodstream. Tissues that use the glucose more than normal tissues (such as tumors) can be detected by a scanning machine. PET scans can be used to find small tumors or to check if treatment for a known tumor is working.
- lymph node biopsy - a sample of tissue is removed from the lymph node and examined under a microscope.
- lymphangiogram - an imaging study that can detect cancer cells or abnormalities in the lymphatic system and structures. It involves a dye being injected into the lymph system.
- bone marrow aspiration and/or biopsy - a procedure that involves taking a small amount of bone marrow fluid (aspiration) and/or solid bone marrow tissue (called a core biopsy), usually from the hip bones, to be examined for the number, size, and maturity of blood cells and/or abnormal cells.
- lumbar puncture (to evaluate central nervous system disease for cancer cells ) - a special needle is placed into the lower back, into the spinal canal. This is the area around the spinal cord. A small amount of cerebral spinal fluid (CSF) can be removed and sent for testing. CSF is the fluid which bathes the brain and spinal cord.
Treatment of non-Hodgkin's lymphoma:
Specific treatment for non-Hodgkin's lymphoma will be determined by your child's physician based on:
- your child's age, overall health, and medical history
- extent of the disease
- your child's tolerance for specific medications, procedures, or therapies
- the expectations for the course of the disease
- your opinion or preference
Three types of standard treatment are used to treat childhood NHL:
- Chemotherapy – Chemotherapy is a cancer treatment that uses drugs to stop the growth of cancer cells, either by killing the cells or by stopping the cells from dividing. When chemotherapy is taken by mouth or injected into a vein or muscle, the drugs enter the blood stream and can reach cancer cells throughout the body (systemic chemotherapy). When chemotherapy is placed directly in the spinal column (intrathecal chemotherapy), a body cavity such as the abdomen, or an organ, the drugs mainly affect cancer cells in those areas. Intrathecal chemotherapy may be used to treat childhood non-Hodgkin’s lymphoma that has spread or may spread to the brain. When used to prevent spread to the brain, it is called CNS (central nervous system) prophylaxis.
- Radiation therapy – This approach uses high-energy X-rays or other types of radiation to kill cancer cells. There are two types of radiation therapy. External radiation therapy uses a machine outside the body to send radiation toward the cancer. Internal radiation therapy uses a radioactive substance sealed in needles, seeds, wires or catheters that are placed directly or near the cancer. Radiation for childhood Hodgkin’s lymphoma usually comes from a machine outside the body (external beam radiation therapy).
- High-dose chemotherapy with stem cell transplantation – This treatment is a method of giving high doses of chemotherapy and then replacing blood-forming cells destroyed by the cancer treatment. Stem cell (immature blood cells) are removed from the bone marrow or blood of the patient or a donor and are frozen for storage. After the chemotherapy is completed, the stored stem cells are thawed and given back to the patient through an infusion. These reinfused stem cells grow into and restore the body’s blood cells.
- Monoclonal antibody therapy – This uses antibodies made in the laboratory from a single type of immune system cell. These antibodies can identify substances on cancer cells or normal substances that may help cancer cells grow. The antibodies attach to the substances and kill the cancer cells or block their growth. Monoclonal antibodies are given by infusion. They may be used alone or to deliver drugs, toxins or radioactive material directly to cancer cells,
Treatment may also include (alone or in combination):
- close monitoring of blood work
- bone marrow transplant
- bone marrow examinations
- lumbar punctures/spinal taps
- antibiotics (to prevent or treat infections )
- supportive care (for side effects of treatment )
- long-term follow up care (to determine response to treatment, detect recurrent disease, and manage late effects of treatment)
Long-term outlook for a child with non-Hodgkin's lymphoma:
Prognosis greatly depends on:
- the extent of the disease.
- the presence or absence of metastasis.
- the response to therapy.
- age and overall health of the child.
- your child's tolerance of specific medications, procedures, or therapies.
- new developments in treatment.
As with any cancer, prognosis and long-term survival can vary greatly from child to child. Every child is unique and treatment and prognosis is structured around the child. Prompt medical attention and aggressive therapy are important for the best prognosis. Continuous follow-up care is essential for the child diagnosed with non-Hodgkin's lymphoma. Side effects of radiation and chemotherapy, as well as second malignancies, can occur in survivors of non-Hodgkin's lymphoma. New methods are continually being discovered to improve treatment and to decrease side effects.
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