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Lymphoma is a type of blood cancer that occurs when B or T lymphocytes, the white blood cells that form a part of the immune system and help protect the body from infection and disease, divide faster than normal cells or live longer than they are supposed to. Lymphoma may develop in the lymph nodes, spleen, bone marrow, blood or other organs and eventually they form a tumor.
Typically, lymphoma presents as a solid tumor of lymphoid cells. Treatment might involve chemotherapy and in some cases radiotherapy and/or bone marrow transplantation, and lymphomas can be curable depending on the histology, type, and stage of the disease. These malignant cells often originate in lymph nodes, presenting as an enlargement of the node (a tumor). It can also affect other organs in which case it is referred to as extranodal lymphoma. Extranodal sites include the tonsils, skin, brain, bowels and bone. Lymphomas are closely related to lymphoid leukemias, which also originate in lymphocytes but typically involve only circulating blood and the bone marrow (where blood cells are generated in a process termed haematopoiesis) and do not usually form static tumors. There are many types of lymphomas, and in turn, lymphomas are a part of the broad group of diseases called hematological neoplasms.
Signs and symptoms
Lymphoma presents with certain non-specific symptoms. If symptoms are persistent, lymphoma needs to be excluded medically.
- Lymphadenopathy or swelling of lymph nodes – It is the primary presentation in lymphoma.
- B symptoms (systemic symptoms) – Can be associated with both Hodgkin's lymphoma and non-Hodgkin's lymphoma. They consist of:
- Other Symptoms :
Lymphoma is definitively diagnosed by a lymph node biopsy, meaning a partial or total excision of a lymph node that is then examined under the microscope. This examination reveals histopathological features that may indicate lymphoma. After lymphoma is diagnosed, a variety of tests may be carried out to look for specific features characteristic of different types of lymphoma. These include:
Several classification systems have existed for lymphoma. These systems use histological findings and other findings to divide lymphoma into different categories. The classification of lymphoma can affect treatment and prognosis. Classification systems generally classify lymphoma according to:
- Whether or not it is a Hodgkin lymphoma.
- Whether the cell that is replicating is a T cell or B cell.
- The site that the cell arises from.
Hodgkin lymphoma is one of the best-known types of lymphoma, and differs from other forms of lymphoma in its prognosis and several pathological characteristics. A division into Hodgkin and non-Hodgkin lymphomas is used in several formal classification systems. A Hodgkin lymphoma is marked by the presence of a type of cell called the Reed-Sternberg cell.
The current accepted definition is the WHO classification, published in 2001 and updated in 2008, is the latest classification of lymphoma and is based upon the foundations laid within the "Revised European-American Lymphoma classification" (REAL). This system attempts to group lymphomas by cell type (i.e. the normal cell type that most resembles the tumor) and defining phenotypic, molecular or cytogenetic characteristics. There are three large groups: the B cell, T cell, and natural killer cell tumors. Other less common groups, are also recognized. Hodgkin lymphoma, although considered separately within the World Health Organization (and preceding) classifications, is now recognized as being a tumor of, albeit markedly abnormal, lymphocytes of mature B cell lineage.
Subtypes according to the WHO classification
- Chronic lymphocytic leukemia/Small lymphocytic lymphoma
- B-cell prolymphocytic leukemia
- Lymphoplasmacytic lymphoma (such as Waldenström macroglobulinemia)
- Splenic marginal zone lymphoma
- Plasma cell neoplasms:
- Extranodal marginal zone B cell lymphoma, also called MALT lymphoma
- Nodal marginal zone B cell lymphoma (NMZL)
- Follicular lymphoma
- Mantle cell lymphoma
- Diffuse large B cell lymphoma
- Mediastinal (thymic) large B cell lymphoma
- Intravascular large B cell lymphoma
- Primary effusion lymphoma
- Burkitt lymphoma/leukemia
- T cell prolymphocytic leukemia
- T cell large granular lymphocytic leukemia
- Aggressive NK cell leukemia
- Adult T cell leukemia/lymphoma
- Extranodal NK/T cell lymphoma, nasal type
- Enteropathy-type T cell lymphoma
- Hepatosplenic T cell lymphoma
- Blastic NK cell lymphoma
- Mycosis fungoides / Sezary syndrome
- Primary cutaneous CD30-positive T cell lymphoproliferative disorders
- Primary cutaneous anaplastic large cell lymphoma
- Lymphomatoid papulosis
- Angioimmunoblastic T cell lymphoma
- Peripheral T cell lymphoma, unspecified
- Anaplastic large cell lymphoma
- Classical Hodgkin lymphomas:
- Nodular sclerosis
- Mixed cellularity
- Lymphocyte depleted or not depleted
- Nodular lymphocyte-predominant Hodgkin lymphoma
- Associated with a primary immune disorder
- Associated with the Human Immunodeficiency Virus (HIV)
- Associated with methotrexate therapy
- Primary central nervous system lymphoma occurs most often in immuno-compromised patients, in particular those with AIDS, but it can occur in the immunocompetent as well. It has a poor prognosis, particularly in those with AIDS. Treatment can consist of corticosteroids, radiotherapy, and chemotherapy, often with methotrexate.
The 1996 Working Formulation was a classification of non-Hodgkin lymphoma. It excluded the Hodgkin lymphomas and divided the remaining lymphomas into four grades (Low, Intermediate, High, and Miscellaneous) related to prognosis, with some further subdivisions based on the size and shape of affected cells. This purely histological classification included no information about cell surface markers, or genetics, and it made no distinction between T-cell lymphomas or B-cell lymphomas. It was widely accepted at the time of its publication but is now obsolete. It is still used by some cancer agencies for compilation of lymphoma statistics and historical rate comparisons.
- REAL. In the mid 1990s, the Revised European-American Lymphoma (REAL) Classification attempted to apply immunophenotypic and genetic features in identifying distinct clinicopathologic entities among all the lymphomas except Hodgkin's lymphoma.
- ICD-O (codes 9590–9999, details at Template:Wayback)
- ICD-10 (codes C81-C96, details at )
There are many forms of lymphoma. Some forms of lymphoma are categorized as indolent (e.g. small lymphocytic lymphoma), compatible with a long life even without treatment, whereas other forms are aggressive (e.g. Burkitt's lymphoma), causing rapid deterioration and death. However, most of the aggressive lymphomas respond well to treatment and are curable. The prognosis therefore depends on the correct diagnosis and classification of the disease, which is established after examination of a biopsy by a pathologist (usually a hematopathologist).
|Lymphoma type||Relative incidence ||Histopathology ||Immunophenotype||Overall
|Other comments |
|Precursor T-cell leukemia/lymphoma||40% of lymphomas in childhood.||Lymphoblasts with irregular nuclear contours, condensed chromatin, small nucleoli and scant cytoplasm without granules.||TdT, CD2, CD7||It often presents as a mediastinal mass because of involvement of the thymus. It is highly associated with NOTCH1 mutations. Most common in adolescent males.|
|Follicular lymphoma||40% of lymphomas in adults||Small "cleaved" cells (centrocytes) mixed with large activated cells (centroblasts). Usually nodular ("follicular") growth pattern||CD10, surface Ig||72–77%||Occurs in older adults. Usually involves lymph nodes, bone marrow and spleen. Associated with t(14;18) translocation overexpressing Bcl-2. Indolent|
|Diffuse large B cell lymphoma||40 to 50% of lymphomas in adults||Variable. Most resemble B cells of large germinal centers. Diffuse growth pattern.||Variable expression of CD10 and surface Ig||60%||Occurs in all ages, but most commonly in older adults. Often occurs outside lymph nodes. Aggressive.|
|Mantle cell lymphoma||3 to 4% of lymphomas in adults||Lymphocytes of small to intermediate size growing in diffuse pattern||CD5||50% to 70%||Occurs mainly in adult males. Usually involves lymph nodes, bone marrow, spleen and GI tract. Associated with t(11;14) translocation overexpressing cyclin D1. Moderately aggressive.|
|B-cell chronic lymphocytic leukemia/lymphoma||3 to 4% of lymphomas in adults||Small resting lymphocytes mixed with variable number of large activated cells. Lymph nodes are diffusely effaced||CD5, surface immunoglobulin||50%.||Occurs in older adults. Usually involves lymph nodes, bone marrow and spleen. Most patients have peripheral blood involvement. Indolent.|
|MALT lymphoma||~5% of lymphomas in adults||Variable cell size and differentiation. 40% show plasma cell differentiation. Homing of B cells to epithelium creates lymphoepithelial lesions.||CD5, CD10, surface Ig||Frequently occurs outside lymph nodes. Very indolent. May be cured by local excision.|
|Burkitt's lymphoma||< 1% of lymphomas in the United States||Round lymphoid cells of intermediate size with several nucleoli. Starry-sky appearance by diffuse spread with interspersed apoptosis.||CD10, surface Ig||50%||Endemic in Africa, sporadic elsewhere. More common in immunocompromised and in children. Often visceral involvement. Highly aggressive.|
|Mycosis fungoides||Most common cutaneous lymphoid malignancy||Usually small lymphoid cells with convoluted nuclei that often infiltrate the epidermis, creating Pautrier microabscesseses.||CD4||75%||Localized or more generalized skin symptoms. Generally indolent. In a more aggressive variant, Sézary's disease, there is skin erythema and peripheral blood involvement.|
|Peripheral T-cell lymphoma-Not-Otherwise-Specified||Most common T cell lymphoma||Variable. Usually a mix small to large lymphoid cells with irregular nuclear contours.||CD3||Probably consists of several rare tumor types. It is often disseminated and generally aggressive.|
|Nodular sclerosis form of Hodgkin lymphoma||Most common type of Hodgkin's lymphoma||Reed-Sternberg cell variants and inflammation. usually broad sclerotic bands that consists of collagen.||CD15, CD30||Most common in young adults. It often arises in the mediastinum or cervical lymph nodes.|
|Mixed-cellularity subtype of Hodgkin lymphoma||Second most common form of Hodgkin's lymphoma||Many classic Reed-Sternberg cells and inflammation||CD15, CD30||Most common in men. More likely to be diagnosed at advanced stages than the nodular sclerosis form. Epstein-Barr virus involved in 70% of cases.|
After a diagnosis and before treatment, a cancer is staged. This refers to deducing how far the cancer has spread, in local tissue and to other sites. Staging is reported as a grade between I (confined) and IV (spread). Staging is carried out because the stage of a cancer impacts its prognosis and treatment.
The Ann Arbor staging system is routinely used for staging of both HL and NHL. In this staging system, I represents a localized disease contained within a lymph node, II the presence of lymphoma in two or more lymph nodes, III spread of the lymphoma to both sides of the diaphragm, and IV to tissue outside a lymph node.
Prognosis and treatment is different for HL and between all the different forms of NHL, and also depends on the grade of tumour, referring to how quickly a cancer replicates. Paradoxically, high-grade lymphomas are more readily treated and have better prognoses . A well-known example of a high-grade tumour is that of Burkitt's lymphoma, which is a high-grade tumour that has been known to double within days, but is readily treated.
Many low-grade lymphomas remain indolent for many years. In these lymphomas, metastases are very likely. For this reason, treatment of the non-symptomatic patient is often avoided. In these forms of lymphoma ,Template:Which watchful waiting is often the initial course of action. This is carried out because the harms and risks of treatment outweigh the benefits. If a low-grade lymphoma is becoming symptomatic, radiotherapy or chemotherapy are the treatments of choice; although they do not cure the lymphoma, they can alleviate the symptoms, particularly painful lymphadenopathy. Patients with these types of lymphoma can live near-normal lifespans, but the disease is incurable.
Treatment of some other, more aggressive, forms of lymphoma Template:Which can result in a cure in the majority of cases, but the prognosis for patients with a poor response to therapy is worse. Treatment for these types of lymphoma typically consists of aggressive chemotherapy, including the CHOP or R-CHOP regimen.
Hodgkin lymphoma typically is treated with radiotherapy alone, as long as it is localized. Advanced Hodgkin disease requires systemic chemotherapy, sometimes combined with radiotherapy. Chemotherapy used includes the ABVD regimen.
|5-year relative survival by stage at diagnosis|
|Stage at diagnosis||5-year relative
of cases (%)
|Localized (confined to primary site)||82.1||27|
|Regional (spread to regional lymph nodes)||77.5||19|
|Distant (cancer has metastasized)||59.9||45|
Lymphoma is the most common form of hematological malignancy, or "blood cancer", in the developed world.
Taken together, lymphomas represent 5.3% of all cancers (excluding simple basal cell and squamous cell skin cancers) in the United States and 55.6% of all blood cancers.
According to the U.S. National Institutes of Health, lymphomas account for about five percent of all cases of cancer in the United States, and Hodgkin's lymphoma in particular accounts for less than one percent of all cases of cancer in the United States.
Because the whole system is part of the body's immune system, patients with a weakened immune system such as from HIV infection or from certain drugs or medication also have a higher incidence of lymphoma.
Thomas Hodgkin published the first description of lymphoma in 1832, specifically of the form named after him, Hodgkin's lymphoma. Since then, many other forms of lymphoma have been described, grouped under several proposed classifications. The 1982 Working formulation became very popular. It introduced the category non-Hodgkin lymphoma, divided into 16 diseases. However, because these lymphomas have little in common with each other, the NHL label is of limited usefulness for doctors or patients and is slowly being abandoned. The latest classification by the WHO (2008) lists 70 forms of lymphoma divided into four broad groups.
As an alternative to the American Lakes-Butler classification, in the early 1970s, Karl Lennert of Kiel, Germany, proposed a new system of classifying lymphomas based on cellular morphology and their relationship to cells of the normal peripheral lymphoid system.
Significant research into the causes, prevalence, diagnosis, treatment, and prognosis of lymphoma is being performed. Hundreds of clinical trials are being planned or conducted at any given time. Studies may focus on effective means of treatment, better ways of treating the disease, improving the quality of life for patients, or appropriate care in remission or after cures.
In general, there are two types of lymphoma research: clinical or translational research and basic research. Clinical/translational research focuses on studying the disease in a defined and generally immediately patient-applicable way, such as testing a new drug in patients. By contrast, basic science research studies the disease process at a distance, such as seeing whether a suspected carcinogen can cause healthy cells to turn into lymphoma cells in the laboratory or how the DNA changes inside lymphoma cells as the disease progresses. The results from basic research studies are generally less immediately useful to patients with the disease but can improve scientists' understanding of lymphoma and form the foundation for future, more effective treatments.
Affects one in three adults
Affecting about 35 percent of all adults in the United States according to the CDC, metabolic syndrome contributes to weight gain, by causing a state of internal starvation called metabolic starvation. This in turn leads to increases hunger, sugar cravings and increased portions leading to overeating and weight gain.
Cause and effect misunderstood
Since we traditionally thought that the portion control (which in turn was attributed wrongly to poor will power)is the cause of weight gain, rather than the effect of this metabolic starvation, all our traditional ideas about cause and effect of obesity were not only wrong but lead to the “blame the victim” attitude when it comes to obesity.
Secret of weight gain revealed
Secret of weight gain, and metabolic syndrome revealed - it has been recently proven that metabolic syndrome, and the weight gain itself are caused by a process called insulin resistance. Check your metabolic syndrome risk using the free Metabolic syndrome meter. Watch this amazing Ted Med video that reveals the secret of weight loss - Stop blaming the victim for obesity
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- Cyberbullying see bullying
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- Dental health in children
- Down syndrome
- Driving risk
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- Ear infections in children
- Early labor and birth (see preterm labor and birth)
- Early learning
- Early puberty (see puberty and precocious puberty)
- Eczema and atopic dermatitis
- Fertility problems (see infertility and fertility)
- Fibroids (see uterine fibroids)
- Fragile x syndrome
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- Fragile x-associated tremor and ataxia syndrome (fxtas)
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- HIV and AIDS]]
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- Maternal mortality
- Mccune-albright syndrome (mas)
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- Menkes disease
- Menstruation and menstrual problems
- Miscarriage (see pregnancy loss (before 20 weeks of pregnancy))
- Monosomy x (see turner syndrome)
- Muscular dystrophy
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- Pediatric injury
- Pelvic floor disorders
- Pelvic pain
- Pheochromocytoma and paraganglioma
- Pituitary tumors
- Polycystic ovary syndrome
- Prader-willi syndrome
- Preconception care and prenatal care
- Preeclampsia and eclampsia
- Pregnancy loss (before 20 weeks of pregnancy)
- Preterm labor and birth
- Primary ovarian insufficiency
- Puberty and precocious puberty
- Reading and reading disorders
- Rehabilitation medicine
- Rehabilitative and assistive technology
- Rett syndrome
- Rh incompatibility
- Sexually transmitted diseases
- Shaken baby syndrome
- Skipped or no menstrual periods (see amenorrhea
- Spina bifida
- Spinal cord injury
- Spinal muscular atrophy
- Sudden infant death syndrome
- Toxemia (see preeclampsia and eclampsia)
- Traumatic brain injury
- Trisomy 21 (see down syndrome)
- Turner syndrome
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- "What is lymphoma?". Medical News Today. Retrieved 28 February 2013.
- "About Lymphoma". Lymphoma Research Foundation. Retrieved 22 December 2012.
- "Warning Signs of Lymphoma — First Signs of Lymphoma". Lymphoma.about.com. Retrieved 2012-12-01.
- Mallick, Indranil. "How Is Lymphoma Diagnosed?". lymphoma.about.com. Retrieved 22 December 2012.
- National Cancer Institute, "Hodgkin Lymphoma", http://www.cancer.gov/cancertopics/types/hodgkin, accessed on 2013-08-05
- National Cancer Institute. "What You Need To Know About Hodgkin Lymphoma". U.S. Dept of Health and Human Services, (online at http://www.cancer.gov/cancertopics/wyntk/hodgkin.pdf), pg 4.
- 50% for limited stage, according to:
- 70% for advanced stage, according to most recent values in:
- "Chronic Leukemias". The Merck Manual of Geriatrics.
-  Data from the USA 1999–2006, All Races, Both Sexes: Altekruse SF, Kosary CL, Krapcho M, Neyman N, Aminou R, Waldron W, Ruhl J, Howlader N, Tatalovich Z, Cho H, Mariotto A, Eisner MP, Lewis DR, Cronin K, Chen HS, Feuer EJ, Stinchcomb DG, Edwards BK (eds). SEER Cancer Statistics Review, 1975–2007, National Cancer Institute. Bethesda, MD, http://seer.cancer.gov/csr/1975_2007/, based on November 2009 SEER data submission, posted to the SEER web site, 2010.
- Horner MJ, Ries LAG, Krapcho M, Neyman N, et al. (eds). "SEER Cancer Statistics Review, 1975–2006". Surveillance Epidemiology and End Results (SEER). Bethesda, MD: National Cancer Institute. Retrieved 3 November 2009.
Table 1.4: Age-Adjusted SEER Incidence and U.S. Death Rates and 5-Year Relative Survival Rates By Primary Cancer Site, Sex and Time PeriodCS1 maint: Multiple names: authors list (link)
- "Understanding Clinical Trials for Blood Cancers" (PDF). Leukemia and Lymphoma Society. Retrieved 19 May 2010.