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Langerhans cell histiocytosis is a disease that can damage tissue or cause lesions to form in one or more places in the body.
Langerhans cell histiocytosis (LCH) is a rare disease that begins in LCH cells (a type of dendritic cell which fights infection). Sometimes there are changes in LCH cells as they form. These changes may cause the LCH cells to grow and multiply quickly. This causes the LCH cells to build up in certain parts of the body, where they can damage tissue or form lesions.
LCH is not a disease of Langerhans cells that normally form in skin.
Scientists do not agree on whether LCH is a type of cancer or is a condition caused by a change in the immune system. LCH is mainly treated with anticancer drugs. Some of these drugs are also used to treat immune system conditions.
LCH may occur at any age, but is most common in young children. Treatment of LCH in childhood is different from treatment of LCH in adults. The treatments for LCH in children and adults are described in separate sections of this summary.
Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with childhood Langerhans cell histiocytosis. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site.
Family history and having a parent who was exposed to certain chemicals may increase the risk of LCH.
Anything that increases your risk of getting a disease is called a risk factor. Having a risk factor does not mean that you will get the disease; not having risk factors doesn't mean that you will not get the disease. Talk with your doctor if you think you may be at risk. Risk factors for LCH may include the following:
The cause of LCH is not known.
The signs and symptoms of LCH depend on where it occurs in the body.
These and other symptoms may be caused by LCH. Other conditions may cause the same symptoms. Check with your doctor if you have any of the following problems:
In infants, signs and symptoms of LCH may include:
In children and adults, signs and symptoms of LCH may include:
Signs and symptoms of LCH may include:
Lymph nodes and thymus
Endocrine system (including the pituitary gland)
Central nervous system
Liver and spleen
Tests that examine the organs and body systems where LCH may occur are used to detect (find) and diagnose LCH.
The following tests and procedures may be used to detect (find) and diagnose LCH or conditions caused by LCH:
Certain factors affect prognosis (chance of recovery) and treatment options.
LCH in organs such as the skin, bones, lymph nodes, or pituitary gland usually gets better with treatment and is called "low- risk". LCH in the spleen, liver, or bone marrow is harder to treat and is called "high-risk".
The prognosis (chance of recovery) and treatment options depend on the following:
In infants up to one year of age, LCH may go away without treatment.
There is no staging system for Langerhans cell histiocytosis (LCH).
The extent or spread of disease is usually described as stages. There is no staging system for LCH.
Treatment of LCH is based on where LCH cells are found in the body and whether one or more body systems are affected.
LCH is described as single-system disease or multisystem disease, depending on how many body systems are affected:
LCH may affect low-risk organs or high-risk organs, depending on where it occurs in the body:
Recurrent Langerhans cell histiocytosis (LCH) is disease that has recurred (come back) after it has been treated. The disease may come back in the same place or in other parts of the body. It often recurs in the bone, ears, skin, or pituitary gland. LCH often recurs the year after stopping treatment. Recurrent LCH is also called reactivation.
There are different types of treatment for patients with Langerhans cell histiocytosis (LCH).
Different types of treatments are available for patients with LCH. Some treatments are standard (the currently used treatment), and some are being tested in clinical trials. A treatment clinical trial is a research study meant to help improve current treatments or obtain information on new treatments for patients. When clinical trials show that a new treatment is better than the standard treatment, the new treatment may become the standard treatment. Whenever possible, patients should take part in a clinical trial in order to receive new types of treatment for LCH.
Clinical trials are taking place in many parts of the country. Information about ongoing clinical trials is available from the NCI Web site. Choosing the most appropriate treatment is a decision that ideally involves the patient, family, and health care team.
Children with LCH should have their treatment planned by a team of health care providers who are experts in treating this disease in children.
Treatment will be overseen by a pediatric oncologist, a doctor who specializes in treating children with cancer. The pediatric oncologist works with other pediatric healthcare providers who are experts in treating children with LCH and who specialize in certain areas of medicine. These may include the following specialists:
Some treatments for LCH cause side effects months or years after treatment has ended.
Some treatments cause side effects that continue or appear months or years after treatment has ended. These are called late effects. Late effects of treatment for LCH may include the following:
Some late effects may be treated or controlled. It is important to talk with your child's doctors about the possible late effects caused by some treatments.
Nine types of standard treatment are used:
LCH is usually treated with anticancer treatments. These treatments stop the LCH cells from growing and dividing.
Watchful waiting is closely monitoring a patient's condition without giving any treatment until symptoms appear or change.
Surgery may be used to remove LCH lesions and a small amount of nearby healthy tissue. Curettage is a type of surgery that uses a curette (a sharp, spoon-shaped tool) to scrape LCH cells from bone.
Radiation therapy is a treatment that uses high-energy x-rays or other types of radiation to kill cells or keep them from growing. External radiation therapy uses a machine outside the body to send radiation toward the LCH lesion.
Photodynamic therapy is a treatment that uses a drug and a certain type of laser light to kill cells. A drug that is not active until it is exposed to light is injected into a vein. The drug collects more in LCH cells than in normal cells. For LCH, laser light is shined onto the skin and the drug becomes active and kills the LCH cells. Photodynamic therapy causes little damage to healthy tissue. Patients who have photodynamic therapy should not spend too much time in the sun.
In one type of photodynamic therapy, called psoralen and ultraviolet A therapy (PUVA), the patient receives a drug called psoralen and then ultraviolet radiation is directed to the skin.
Chemotherapy is a treatment that uses drugs to stop the growth of cells, either by killing the cells or by stopping them from dividing. When chemotherapy is taken by mouth or injected into a vein or muscle, the drugs enter the bloodstream and can reach cells throughout the body (systemic chemotherapy). When chemotherapy is placed directly onto the skin or into the cerebrospinal fluid, an organ, or a body cavity such as the abdomen, the drugs mainly affect cells in those areas (regional chemotherapy).
Nitrogen mustard is a drug that is put directly on the skin to treat small LCH lesions.
Biologic therapy is a treatment that uses the patient's immune system to fight disease. Substances made by the body or made in a laboratory are used to boost, direct, or restore the body's natural defenses against disease. This type of treatment is also called biotherapy or immunotherapy.
Interferon is a type of biologic therapy used to treat LCH of the skin.
Targeted therapy is a type of treatment that uses drugs or other substances to find and attack LCH cells without harming normal cells. Imatinib mesylate is a type of targeted therapy called a tyrosine kinase inhibitor. It stops blood stem cells from turning into dendritic cells.
Other drug therapy
Other drugs used to treat LCH include the following:
Stem cell transplant
Stem cell transplant is a method of giving chemotherapy and replacing blood-forming cells destroyed by the LCH treatment. Stem cells (immature blood cells) are removed from the blood or bone marrow of the patient or a donor and are frozen and stored. 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.
New types of treatment are being tested in clinical trials.
Information about clinical trials is available from the NCI Web site.
Patients may want to think about taking part in a clinical trial.
For some patients, taking part in a clinical trial may be the best treatment choice. Clinical trials are part of the medical research process. Clinical trials are done to find out if new treatments are safe and effective or better than the standard treatment.
Many of today's standard treatments for disease are based on earlier clinical trials. Patients who take part in a clinical trial may receive the standard treatment or be among the first to receive a new treatment.
Patients who take part in clinical trials also help improve the way diseases will be treated in the future. Even when clinical trials do not lead to effective new treatments, they often answer important questions and help move research forward.
Patients can enter clinical trials before, during, or after starting their treatment.
Some clinical trials only include patients who have not yet received treatment. Other trials test treatments for patients whose disease has not gotten better. There are also clinical trials that test new ways to stop a disease from recurring (coming back) or reduce the side effects of treatment.
Clinical trials are taking place in many parts of the country. See the Treatment Options for Childhood LCH and the Treatment Options for Adult LCH sections for links to current treatment clinical trials. These have been retrieved from NCI's clinical trials database.
When treatment of LCH stops, new lesions may appear or old lesions may come back.
Many patients with LCH get better with treatment. However, when treatment stops, new lesions may appear or old lesions may come back. This is called reactivation (recurrence) and may occur within one year after stopping treatment. Patients with multisystem disease are more likely to have a reactivation. More common sites of reactivation are bone, ears, or skin, and diabetes insipidus also may develop. Less common sites of reactivation include lymph nodes, bone marrow, spleen, liver, or lung. Some patients may have more than one reactivation over a number of years.
Follow-up tests may be needed.
Some of the tests that were done to diagnose the disease may be repeated. This is to see how well the treatment is working and if there are any new lesions. These tests may include:
Other tests that may be needed include:
Decisions about whether to continue, change, or stop treatment may be based on the results of these tests.
Some of the tests will continue to be done from time to time after treatment has ended. The results of these tests can show if your condition has changed or if the disease has recurred (come back). These tests are sometimes called follow-up tests or check-ups.
Treatment of Low-Risk Disease
Treatment of childhood Langerhans cell histiocytosis (LCH) skin lesions may include the following:
Bone Lesions and Other Low-Risk Organ Lesions
Treatment of childhood LCH bone lesions in the front, sides, or back of the skull, or in any other single bone may include the following:
Treatment of childhood LCH lesions in bones around the ears or eyes may lower the risk of diabetes insipidus and other long-term problems. Treatment may include:
Treatment of spine or hip bone lesions that have weakened the bone and may lead to a broken bone in childhood LCH may include:
Treatment of two or more bone lesions may include:
Treatment of combinations of childhood LCH skin, lymph node, pituitary gland, and bone lesions may include:
Treatment of High-Risk Disease
Treatment of childhood LCH multisystem disease lesions in the spleen, liver, or bone marrow (with or without skin, bone, lymph node, lung, or pituitary gland lesions) may include:
Treatment of childhood LCH central nervous system lesions may include various combinations of the following:
Treatment Options for Recurrent, Refractory, and Progressive Childhood LCH
Recurrent LCH is disease that cannot be detected for some time after treatment and then comes back. Treatment of recurrent childhood LCH in the skin, bone, lymph nodes, gastrointestinal tract, pituitary gland, or central nervous system (low-risk organs) may include:
Refractory LCH is disease that does not get better with treatment. Treatment of refractory childhood LCH in high-risk organs and in multisystem low-risk organs may include high-dose chemotherapy. Treatment of childhood LCH in multisystem high-risk organs that did not respond to chemotherapy may include stem cell transplant.
Progressive LCH is disease that continues to grow during treatment. Treatment of progressive childhood LCH in patients with multisystem disease may include anticancer drugs that have not been given to the patient before.
Langerhans cell histiocytosis (LCH) in adults is a lot like LCH in children and can form in the same organs and systems as it does in children. These include the endocrine and central nervous systems, liver, spleen, bone marrow, and gastrointestinal tract. In adults, LCH is most commonly found in the lung as single-system disease. LCH in the lung occurs more often in young adults who smoke. Adult LCH is also commonly found in bone or skin.
As in children, the signs and symptoms of LCH depend on where it is found in the body. See the General Information section for the signs and symptoms of LCH.
Tests that examine the organs and body systems where LCH may occur are used to detect (find) and diagnose LCH. See the General information section for tests and procedures used to diagnose LCH.
In adults, there is not a lot of information about what treatment works best. Sometimes, information comes only from reports of the diagnosis, treatment, and follow-up of one adult or a small group of adults who were given the same type of treatment.
Treatment Options for LCH of the Lung
Treatment for LCH of the lung in adults may include:
Sometimes LCH of the lung will go away or not get worse even if it's not treated.
Treatment Options for LCH of the Bone
Treatment for LCH that affects only the bone in adults may include:
Treatment Options for LCH of the Skin
Treatment for LCH that affects only the skin in adults may include:
Treatment for LCH that affects the skin and other body systems may include:
Treatment Options for Single-System and Multisystem LCH
Treatment of single-system and multisystem disease in adults may include:
For more information about LCH trials for adults, see the Histiocyte Society website.
Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with adult Langerhans cell histiocytosis. For more specific results, refine the search by using other search features, such as the location of the trial, the type of treatment, or the name of the drug. General information about clinical trials is available from the NCI Web site.
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