|Other names: Non-Hodgkin disease|
|Micrograph of mantle cell lymphoma, a type of non-Hodgkin lymphoma. Terminal ileum. H&E stain.|
|Specialty||Hematology and oncology|
|Symptoms||Enlarged lymph nodes, fever, night sweats, weight loss, tiredness, itching|
|Usual onset||65–75 years old|
|Risk factors||Poor immune function, autoimmune diseases, Helicobacter pylori infection, hepatitis C, obesity, Epstein-Barr virus infection|
|Diagnostic method||Bone marrow or lymph node biopsy|
|Treatment||Chemotherapy, radiation, immunotherapy, targeted therapy, stem cell transplantation, surgery, watchful waiting|
|Prognosis||Five-year survival rate 71% (USA)|
|Frequency||4.3 million (affected during 2015)|
Non-Hodgkin lymphoma (NHL) is a group of blood cancers that includes all types of lymphomas except Hodgkin lymphomas. Symptoms include enlarged lymph nodes, fever, night sweats, weight loss and tiredness. Other symptoms may include bone pain, chest pain or itchiness. Some forms are slow-growing, while others are fast-growing.
Lymphomas are types of cancer that develop from lymphocytes, a type of white blood cell. Risk factors include poor immune function, autoimmune diseases, Helicobacter pylori infection, hepatitis C, obesity, and Epstein–Barr virus infection. The World Health Organization classifies lymphomas into five major groups, including one for Hodgkin lymphoma. Within the four groups for NHL are over 60 specific types of lymphoma. Diagnosis is by examination of a bone marrow or lymph node biopsy. Medical imaging is done to help with cancer staging.
Treatment depends on whether the lymphoma is slow- or fast-growing and if it is in one area or many areas. Treatments may include chemotherapy, radiation, immunotherapy, targeted therapy, stem-cell transplantation, surgery, or watchful waiting. If the blood becomes overly thick due to high numbers of antibodies, plasmapheresis may be used. Radiation and some chemotherapy, however, increase the risk of other cancers, heart disease, or nerve problems over the subsequent decades.
In 2015, about 4.3 million people had non-Hodgkin lymphoma, and 231,400 died. In the United States, 2.1% of people are affected at some point in their life. The most common age of diagnosis is between 65 and 75 years old. The five-year survival rate in the United States is 71%.
Signs and symptoms
The signs and symptoms of non-Hodgkin lymphoma vary depending upon its location within the body. Symptoms include enlarged lymph nodes, fever, night sweats, weight loss, and tiredness. Other symptoms may include bone pain, chest pain, or itchiness. Some forms are slow growing, while others are fast growing. Enlarged lymph nodes may cause lumps to be felt under the skin when they are close to the surface of the body. Lymphomas in the skin may also result in lumps, which are commonly itchy, red, or purple. Lymphomas in the brain can cause weakness, seizures, problems with thinking, and personality changes.[medical citation needed]
The many different forms of lymphoma probably have different causes. These possible causes and associations with at least some forms of NHL include:
- Infectious agents:
- Epstein–Barr virus: associated with Burkitt's lymphoma, Hodgkin lymphoma, follicular dendritic cell sarcoma, extranodal NK-T-cell lymphoma
- Human T-cell leukemia virus: associated with adult T-cell lymphoma
- Helicobacter pylori: associated with gastric lymphoma
- HHV-8: associated with primary effusion lymphoma, multicentric Castleman disease
- Hepatitis C virus: associated with splenic marginal zone lymphoma, lymphoplasmacytic lymphoma and diffuse large B-cell lymphoma
- HIV infection
- Some chemicals, like polychlorinated biphenyls (PCBs), diphenylhydantoin, dioxin, and phenoxy herbicides.
- Medical treatments, like radiation therapy and chemotherapy
- Genetic diseases, like Klinefelter syndrome, Chédiak–Higashi syndrome, ataxia–telangiectasia syndrome
- Autoimmune diseases, like Sjögren syndrome, celiac disease, rheumatoid arthritis, and systemic lupus erythematosus.
Familial lymphoid cancer is rare. The familial risk of lymphoma is elevated for multiple lymphoma subtypes, suggesting a shared genetic cause. However, a family history of a specific subtype is most strongly associated with risk for that subtype, indicating that these genetic factors are subtype-specific. Genome-wide association studies have successfully identified 67 single-nucleotide polymorphisms from 41 loci, most of which are subtype specific.
The Centers for Disease Control and Prevention (CDC) included certain types of non-Hodgkin lymphoma as AIDS-defining cancers in 1987. Immune suppression rather than HIV itself is implicated in the pathogenesis of this malignancy, with a clear correlation between the degree of immune suppression and the risk of developing NHL. Additionally, other retroviruses, such as HTLV, may be spread by the same mechanisms that spread HIV, leading to an increased rate of co-infection. The natural history of HIV infection has been greatly changed over time. As a consequence, rates of non-Hodgkin lymphoma (NHL) in people infected with HIV has significantly declined in recent years.
The traditional treatment of NHL includes chemotherapy, radiotherapy, and stem-cell transplants. There have also been developments in immunotherapy used in the treatment of NHL. The most common chemotherapy used for B-cell non-Hodgkin lymphoma is R-CHOP, which is a regimen of four drugs (cyclophosphamide, doxorubicin, vincristine, and prednisone) plus rituximab.
Prognosis depends on the subtype, the staging, a person's age, and other factors. Across all subtypes, 5-year survival for NHL is 71%, ranging from 81% for Stage 1 disease to 61% for Stage 4 disease.
Globally, as of 2010, there were 210,000 deaths, up from 143,000 in 1990.
With over 6,000 people being diagnosed yearly, NHL is the fifth most common cancer in Australia.
In Canada, NHL is the fifth most common cancer in males and sixth most common cancer in females. The lifetime probability of developing a lymphoid cancer is 1 in 44 for males, and 1 in 51 for females.
On average, according to data for the 2014–2016 period, around 13,900 people are diagnosed with NHL yearly. It is the sixth most common cancer in the UK, and is the eleventh most common cause of cancer death accounting for around 4,900 deaths per year.
Age adjusted data from 2012-2016 shows about 19.6 cases of NHL per 100,000 adults per year, 5.6 deaths per 100,000 adults per year, and around 694,704 people living with non-Hodgkin lymphoma. About 2.2 percent of men and women will be diagnosed with NHL at some point during their lifetime.
While consensus was rapidly reached on the classification of Hodgkin lymphoma, there remained a large group of very different diseases requiring further classification. The Rappaport classification, proposed by Henry Rappaport in 1956 and 1966, became the first widely accepted classification of lymphomas other than Hodgkin. Following its publication in 1982, the Working Formulation became the standard classification for this group of diseases. It introduced the term non-Hodgkin lymphoma or NHL and defined three grades of lymphoma.
NHL consists of many different conditions that have little in common with each other. They are grouped by their aggressiveness. Less aggressive non-Hodgkin lymphomas are compatible with a long survival while more aggressive non-Hodgkin lymphomas can be rapidly fatal without treatment. Without further narrowing, the label is of limited usefulness for people or doctors. The subtypes of lymphoma are listed there.
Nevertheless, the Working Formulation and the NHL category continue to be used by many. To this day, lymphoma statistics are compiled as Hodgkin's versus non-Hodgkin lymphomas by major cancer agencies, including the US National Cancer Institute in its SEER program, the Canadian Cancer Society and the IARC.
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