Myelodysplastic syndrome | |
---|---|
Other names | Preleukemia, myelodysplasia [1] [2] |
Blood smear from a person with myelodysplastic syndrome. A hypogranular neutrophil with a pseudo-Pelger-Huet nucleus is shown. There are also abnormally shaped red blood cells, in part related to removal of the spleen. | |
Specialty | Hematology, oncology |
Symptoms | None, feeling tired, shortness of breath, easy bleeding, frequent infections [3] |
Usual onset | ~ 70 years old [4] |
Risk factors | Previous chemotherapy, radiation therapy, certain chemicals such as tobacco smoke, pesticides, and benzene, exposure to mercury or lead [3] |
Diagnostic method | Blood test, bone marrow biopsy [3] |
Treatment | Supportive care, medications, stem cell transplantation [3] |
Medication | Lenalidomide, antithymocyte globulin, azacitidine [3] |
Prognosis | Typical survival time 2.5 years [3] |
A myelodysplastic syndrome (MDS) is one of a group of cancers in which immature blood cells in the bone marrow do not mature, and as a result, do not develop into healthy blood cells. [3] Early on, no symptoms typically are seen. [3] Later, symptoms may include fatigue, shortness of breath, bleeding disorders, anemia, or frequent infections. [3] Some types may develop into acute myeloid leukemia. [3]
Risk factors include previous chemotherapy or radiation therapy, exposure to certain chemicals such as tobacco smoke, pesticides, and benzene, and exposure to heavy metals such as mercury or lead. [3] Problems with blood cell formation result in some combination of low red blood cell, platelet, and white blood cell counts. [3] Some types of MDS cause an increase in the production of immature blood cells (called blasts), in the bone marrow or blood. [3] The different types of MDS are identified based on the specific characteristics of the changes in the blood cells and bone marrow. [3]
Treatments may include supportive care, drug therapy, and hematopoietic stem cell transplantation. [3] Supportive care may include blood transfusions, medications to increase the making of red blood cells, and antibiotics. [3] Drug therapy may include the medications lenalidomide, antithymocyte globulin, and azacitidine. [3] Some people can be cured by chemotherapy followed by a stem-cell transplant from a donor. [3]
About seven per 100,000 people are affected by MDS; about four per 100,000 people newly acquire the condition each year. [4] The typical age of onset is 70 years. [4] The prognosis depends on the type of cells affected, the number of blasts in the bone marrow or blood, and the changes present in the chromosomes of the affected cells. [3] The average survival time following diagnosis is 2.5 years. [4] MDS was first recognized in the early 1900s; [5] it came to be called myelodysplastic syndrome in 1976. [5]
Signs and symptoms are nonspecific and generally related to the blood cytopenias:
Many individuals are asymptomatic, and blood cytopenia or other problems are identified as a part of a routine blood count: [10]
Although some risk exists for developing acute myelogenous leukemia, about 50% of deaths occur as a result of bleeding or infection. However, leukemia that occurs as a result of myelodysplasia is notoriously resistant to treatment. Anemia dominates the early course. Most symptomatic patients complain of the gradual onset of fatigue and weakness, dyspnea, and pallor, but at least half the patients are asymptomatic and their MDS is discovered only incidentally on routine blood counts. Previous chemotherapy or radiation exposure is an important factor in the person's medical history. Fever, weight loss and splenomegaly should point to a myelodysplastic/myeloproliferative neoplasm (MDS/MPN) rather than pure myelodysplastic process. [11]
Some people have a history of exposure to chemotherapy (especially alkylating agents such as melphalan, cyclophosphamide, busulfan, and chlorambucil) or radiation (therapeutic or accidental), or both (e.g., at the time of stem cell transplantation for another disease). Workers in some industries with heavy exposure to hydrocarbons such as the petroleum industry have a slightly higher risk of contracting the disease than the general population. Xylene and benzene exposures have been associated with myelodysplasia. Vietnam veterans exposed to Agent Orange are at risk of developing MDS. A link may exist between the development of MDS "in atomic-bomb survivors 40 to 60 years after radiation exposure" (in this case, referring to people who were in close proximity to the dropping of the atomic bombs in Hiroshima and Nagasaki during World War II). [12] Children with Down syndrome are susceptible to MDS, and a family history may indicate a hereditary form of sideroblastic anemia or Fanconi anemia. [13]
MDS most often develops without an identifiable cause. Risk factors include exposure to an agent known to cause DNA damage, such as radiation, benzene, and certain chemotherapies; other risk factors have been inconsistently reported. Proving a connection between a suspected exposure and the development of MDS can be difficult, but the presence of genetic abnormalities may provide some supportive information. Secondary MDS can occur as a late toxicity of cancer therapy (therapy associated MDS, t-MDS). MDS after exposure to radiation or alkylating agents such as busulfan, nitrosourea, or procarbazine, typically occurs 3–7 years after exposure and frequently demonstrates loss of chromosome 5 or 7. MDS after exposure to DNA topoisomerase II inhibitors occurs after a shorter latency of only 1–3 years and can have a 11q23 translocation. Other pre-existing bone-marrow disorders such as acquired aplastic anemia following immunosuppressive treatment and Fanconi anemia can evolve into MDS. [13]
MDS is thought to arise from mutations in the multipotent bone-marrow stem cell, but the specific defects responsible for these diseases remain poorly understood. Differentiation of blood precursor cells is impaired, and a significant increase in levels of apoptotic cell death occurs in bone-marrow cells. Clonal expansion of the abnormal cells results in the production of cells that have lost the ability to differentiate. If the overall percentage of bone-marrow myeloblasts rises over a particular cutoff (20% for WHO and 30% for FAB), then transformation to acute myelogenous leukemia (AML) is said to have occurred. The progression of MDS to AML is a good example of the multistep theory of carcinogenesis in which a series of mutations occurs in an initially normal cell and transforms it into a cancer cell. [14]
Although recognition of leukemic transformation was historically important (see History), a significant proportion of the morbidity and mortality attributable to MDS results not from transformation to AML, but rather from the cytopenias seen in all MDS patients. While anemia is the most common cytopenia in MDS patients, given the ready availability of blood transfusion, MDS patients rarely experience injury from severe anemia. The two most serious complications in MDS patients resulting from their cytopenias are bleeding (due to lack of platelets) or infection (due to lack of white blood cells). Long-term transfusion of packed red blood cells leads to iron overload. [15]
The recognition of epigenetic changes in DNA structure in MDS has explained the success of two (namely the hypomethylating agents 5-azacytidine and decitabine) of three (the third is lenalidomide) commercially available medications approved by the U.S. Food and Drug Administration to treat MDS. Proper DNA methylation is critical in the regulation of proliferation genes, and the loss of DNA methylation control can lead to uncontrolled cell growth and cytopenias. The recently approved DNA methyltransferase inhibitors take advantage of this mechanism by creating a more orderly DNA methylation profile in the hematopoietic stem cell nucleus, thereby restoring normal blood counts and retarding the progression of MDS to acute leukemia. [16]
Some authors have proposed that the loss of mitochondrial function over time leads to the accumulation of DNA mutations in hematopoietic stem cells, and this accounts for the increased incidence of MDS in older patients. Researchers point to the accumulation of mitochondrial iron deposits in the ringed sideroblast as evidence of mitochondrial dysfunction in MDS. [17]
Hematopoietic stem cell aging is thought to be associated with the accrual of multiple genetic and epigenetic aberrations leading to the suggestion that MDS is, in part, related to an inability to adequately cope with DNA damage. [18] An emerging perspective is that the underlying mechanism of MDS could be a defect in one or more pathways that are involved in repairing damaged DNA. [19] In MDS an increased frequency of chromosomal breaks indicates defects in DNA repair processes. [20] Also elevated levels of 8-oxoguanine were found in the DNA of a significant proportion of MDS patients, indicating that the base excision repair pathway that is involved in handling oxidative DNA damages may be defective in these cases. [20]
Since at least 1974, the deletion in the long arm of chromosome 5 has been known to be associated with dysplastic abnormalities of hematopoietic stem cells. [21] [22] By 2005, lenalidomide, a chemotherapy drug, was recognized to be effective in MDS patients with the 5q- syndrome, [23] and in December 2005, the US FDA approved the drug for this indication. Patients with isolated 5q-, low IPSS risk, and transfusion dependence respond best to lenalidomide. Typically, prognosis for these patients is favorable, with a 63-month median survival. Lenalidomide has dual action, by lowering the malignant clone number in patients with 5q-, and by inducing better differentiation of healthy erythroid cells, as seen in patients without 5q deletion.[ citation needed ]
Mutations in splicing factors have been found in 40–80% of people with MDS, with a higher incidence of mutations detected in people who have more ring sideroblasts. [24]
Mutations in the genes encoding for isocitrate dehydrogenase 1 and 2 (IDH1 and IDH2) occur in 10–20% of patients with myelodysplastic syndrome, [25] and confer a worsened prognosis in low-risk MDS. [26] Because the incidence of IDH1/2 mutations increases as the disease malignancy increases, these findings together suggest that IDH1/2 mutations are important drivers of progression of MDS to a more malignant disease state. [26]
GATA2 deficiency is a group of disorders caused by a defect, familial, or sporadic inactivating mutations, in one of the two GATA2 genes. These autosomal dominant mutations cause a reduction in the cellular levels of the gene's product, GATA2. The GATA2 protein is a transcription factor critical for the embryonic development, maintenance, and functionality of blood-forming, lymph-forming, and other tissue-forming stem cells. In consequence of these mutations, cellular levels of GATA2 are low and individuals develop over time hematological, immunological, lymphatic, or other presentations. Prominent among these presentations is MDS that often progresses to acute myelocytic leukemia, or less commonly, chronic myelomonocytic leukemia. [27] [28]
Transient myeloproliferative disease is the abnormal proliferation of a clone of noncancerous megakaryoblasts in the liver and bone marrow. The disease is restricted to individuals with Down syndrome or genetic changes similar to those in Down syndrome, develops during pregnancy or shortly after birth, and resolves within 3 months, or in about 10% of cases, progresses to acute megakaryoblastic leukemia. [29] [27] [30]
The elimination of other causes of cytopenias, along with a dysplastic bone marrow, is required to diagnose a myelodysplastic syndrome, so differentiating MDS from anemia, thrombocytopenia, and leukopenia is important.[ citation needed ]
A typical diagnostic investigation includes:
The features generally used to define an MDS are blood cytopenias, ineffective hematopoiesis, dyserythropoiesis, dysgranulopoiesis, dysmegakaropoiesis, and increased myeloblasts.
Dysplasia can affect all three lineages seen in the bone marrow. The best way to diagnose dysplasia is by morphology and special stains (PAS) used on the bone marrow aspirate and peripheral blood smear. Dysplasia in the myeloid series is defined by:
Other stains can help in special cases (PAS and naphthol ASD chloroacetate esterase positivity) in eosinophils is a marker of abnormality seen in chronic eosinophilic leukemia and is a sign of aberrancy.
On the bone-marrow biopsy, high-grade dysplasia (RAEB-I and RAEB-II) may show atypical localization of immature precursors, which are islands of immature precursors cells (myeloblasts and promyelocytes) localized to the center of the intertrabecular space rather than adjacent to the trabeculae or surrounding arterioles. This morphology can be difficult to differentiate from treated leukemia and recovering immature normal marrow elements. Also, topographic alteration of the nucleated erythroid cells can be seen in early myelodysplasia (RA and RARS), where normoblasts are seen next to bony trabeculae instead of forming normal interstitially placed erythroid islands.[ citation needed ]
Myelodysplasia is a diagnosis of exclusion and must be made after proper determination of iron stores, vitamin deficiencies, and nutrient deficiencies are ruled out. Also, congenital diseases such as congenital dyserythropoietic anemia (CDA I through IV) have been recognized, Pearson's syndrome (sideroblastic anemia), Jordans anomaly – vacuolization in all cell lines may be seen in Chanarin-Dorfman syndrome, aminolevulinic acid enzyme deficiency and other more esoteric enzyme deficiencies are known to give a pseudomyelodysplastic picture in one of the cell lines; however, all three cell lines are never morphologically dysplastic in these entities with the exception of chloramphenicol, arsenic toxicity, and other poisons.[ citation needed ]
All of these conditions are characterized by abnormalities in the production of one or more of the cellular components of blood (red cells, white cells other than lymphocytes, and platelets or their progenitor cells, megakaryocytes).[ citation needed ]
In the late 1990s, a group of pathologists and clinicians working under the World Health Organization (WHO) modified this classification, introducing several new disease categories and eliminating others. In 2008, the WHO developed a new classification scheme that is based more on genetic findings, but morphology of the cells in the peripheral blood, bone marrow aspirate, and bone marrow biopsy are still the screening tests used to decide which classification is best and which cytogenetic aberrations may be related.[ citation needed ]
The list of dysplastic syndromes under the new WHO system includes:
Myelodysplastic syndrome | Description |
---|---|
Refractory cytopenia with unilineage dysplasia | Refractory anemia, Refractory neutropenia, and Refractory thrombocytopenia. |
Refractory anemia with ringed sideroblasts (RARS) | Thrombocytosis (RARS-t) (provisional entity) which is in essence a myelodysplastic/myeloproliferative disorder and usually has a JAK2 mutation (janus kinase) – New WHO classification 2008 |
Refractory cytopenia with multilineage dysplasia (RCMD) | Includes the subset Refractory cytopenia with multilineage dysplasia and ring sideroblasts (RCMD-RS). RCMD includes patients with pathological changes not restricted to red cells (i.e., prominent white cell precursor and platelet precursor (megakaryocyte) dysplasia. |
Refractory anemia with excess blasts I and II | RAEB was divided into RAEB-I (5–9% blasts) and RAEB-II (10–19%) blasts, which has a poorer prognosis than RAEB-I. Auer rods may be seen in RAEB-II which may be difficult to distinguish from acute myeloid leukemia. |
5q- syndrome | Typically seen in older women with normal or high platelet counts and isolated deletions of the long arm of chromosome 5 in bone marrow cells, was added to the classification. |
Myelodysplasia unclassifiable | Seen in those cases of megakaryocyte dysplasia with fibrosis and others. |
Refractory cytopenia of childhood (dysplasia in childhood) | – |
Note : not all physicians concur with this reclassification, because the underlying pathology of this disease is not well understood.
The WHO has proposed a criterion for diagnosis and classification of MDS that may apply to most cases. However, occasional cases are difficult to classify into defined categories because of one or more unusual features:[ citation needed ]
The goals of therapy are to control symptoms, improve quality of life, improve overall survival, and decrease progression to AML.
The IPSS scoring [34] system can help triage patients for more aggressive treatment (i.e. bone marrow transplant) as well as help determine the best timing of this therapy. [35] Supportive care with blood products and hematopoietic growth factors (e.g. erythropoietin) is the mainstay of therapy. The regulatory environment for the use of erythropoietins is evolving, according to a recent US Medicare National coverage determination. However, no comment on the use of hematopoietic growth factors for MDS was made in that document. [36]
Agents have been approved by the U.S. Food and Drug Administration (FDA) for the treatment of MDS:
Chemotherapy with the hypomethylating agents 5-azacytidine and decitabine has been shown to decrease blood transfusion requirements and to retard the progression of MDS to AML. Lenalidomide was approved by the FDA in December 2005 only for use in the 5q- syndrome. In the United States, treatment of MDS with lenalidomide costs about $9,200 per month. [47] The chemotherapy may be supported by other drugs like all-trans retinoic acid (ATRA), however the evidence of benefit is not clear. [48]
HLA-matched allogeneic stem cell transplantation, particularly in younger (i.e. less than 40 years of age) and more severely affected patients, offers the potential for curative therapy. The success of bone marrow transplantation has been found to correlate with severity of MDS as determined by the IPSS score, with patients having a more favorable IPSS score tend to have a more favorable outcome with transplantation. [49]
Iron overload can develop in MDS as a result of the RBC transfusions, which are a major part of the supportive care for anemic MDS patients. Although the specific therapies patients receive may alleviate the RBC transfusion need in some cases, many MDS patients may not respond to these treatments, thus may develop secondary hemochromatosis due to iron overload from repeated RBC transfusions. Patients requiring relatively large numbers of RBC transfusions can experience the adverse effect of chronic iron overload on their liver, heart, and endocrine functions.
For patients requiring many RBC transfusions, serum ferritin levels, number of RBC transfusions received, and associated organ dysfunction (heart, liver, and pancreas) should be monitored to determine iron levels. Monitoring serum ferritin may also be useful, aiming to decrease ferritin levels to < 1000 µg/L.Currently, two iron chelators are available in the US, deferoxamine for intravenous use and deferasirox for oral use. These options now provide potentially useful drugs for treating the iron overload problem. A third chelating agent is available in Europe, deferiprone, for oral use, but is not available in the US.[ citation needed ]
Clinical trials in MDS patients are ongoing, with iron chelating agents to address the question of whether iron chelation alters the natural history of patients with MDS who are transfusion dependent. Reversal of some of the consequences of iron overload in MDS by iron chelation therapy has been shown. Both the MDS Foundation and the National Comprehensive Cancer Network MDS Guidelines Panel have recommended that chelation therapy be considered to decrease iron overload in selected MDS patients. Evidence also suggests a potential value exists to iron chelation in patients who will undergo a stem-cell transplant. Although deferasirox is generally well tolerated (other than episodes of gastrointestinal distress and kidney dysfunction in some patients), recently a safety warning by the FDA and Novartis was added to deferasirox treatment guidelines. Following postmarketing use of deferasirox, rare cases of acute kidney failure or liver failure occurred, some resulting in death. Due to this, patients should be closely monitored on deferasirox therapy prior to the start of therapy and regularly thereafter.[ citation needed ]
The outlook in MDS is variable, with about 30% of patients progressing to refractory AML. The median survival time varies from years to months, depending on type. Stem-cell transplantation offers possible cure, with survival rates of 50% at 3 years, although older patients do poorly. [50]
Indicators of a good prognosis: Younger age; normal or moderately reduced neutrophil or platelet counts; low blast counts in the bone marrow (< 20%) and no blasts in the blood; no Auer rods; ringed sideroblasts; normal or mixed karyotypes without complex chromosome abnormalities; and in vitro marrow culture with a nonleukemic growth pattern
Indicators of a poor prognosis: Advanced age; severe neutropenia or thrombocytopenia; high blast count in the bone marrow (20–29%) or blasts in the blood; Auer rods; absence of ringed sideroblasts; abnormal localization or immature granulocyte precursors in bone marrow section; completely or mostly abnormal karyotypes, or complex marrow chromosome abnormalities and in vitro bone marrow culture with a leukemic growth pattern
Karyotype prognostic factors:
The IPSS is the most commonly used tool in MDS to predict long-term outcome. [52]
Cytogenetic abnormalities can be detected by conventional cytogenetics, a FISH panel for MDS, or virtual karyotype.
The best prognosis is seen with RA and RARS, where some nontransplant patients live more than a decade (typical is on the order of three to five years, although long-term remission is possible if a bone-marrow transplant is successful). The worst outlook is with RAEB-T, where the mean life expectancy is less than one year. About one-quarter of patients develop overt leukemia. The others die of complications of low blood count or unrelated diseases. The International Prognostic Scoring System is another tool for determining the prognosis of MDS, published in Blood in 1997. [52] This system takes into account the percentage of blasts in the marrow, cytogenetics, and number of cytopenias.
Although not yet formally incorporated in the generally accepted classification systems, molecular profiling of myelodysplastic syndrome genomes has increased the understanding of prognostic molecular factors for this disease. For example, in low-risk MDS, IDH1 and IDH2 mutations are associated with significantly worsened survival. [26]
The exact number of people with MDS is not known because it can go undiagnosed and no tracking of the syndrome is mandated. Some estimates are on the order of 10,000 to 20,000 new cases each year in the United States alone. The number of new cases each year is probably increasing as the average age of the population increases, and some authors propose that the number of new cases in those over 70 may be as high as 15 per 100,000 per year. [53]
The typical age at diagnosis of MDS is between 60 and 75 years; a few people are younger than 50, and diagnoses are rare in children. Males are slightly more commonly affected than females.[ citation needed ]
Since the early 20th century, some people with acute myelogenous leukemia were begun to be recognized to have a preceding period of anemia and abnormal blood cell production. These conditions were lumped together with other diseases under the term "refractory anemia". The first description of "preleukemia" as a specific entity was published in 1953 by Block et al. [54] The early identification, characterization and classification of this disorder were problematical, and the syndrome went by many names until the 1976 FAB classification was published and popularized the term MDS.[ citation needed ]
In 1974 and 1975, a group of pathologists from France, the US, and Britain produced the first widely used classification of these diseases. This French-American-British classification was published in 1976, [55] and revised in 1982. It was used by pathologists and clinicians for almost 20 years. Cases were classified into five categories:
ICD-O | Name | Description |
---|---|---|
M9980/3 | Refractory anemia (RA) | characterized by less than 5% primitive blood cells (myeloblasts) in the bone marrow and pathological abnormalities primarily seen in red cell precursors |
M9982/3 | Refractory anemia with ring sideroblasts (RARS) | also characterized by less than 5% myeloblasts in the bone marrow, but distinguished by the presence of 15% or greater of red cell precursors in the marrow being abnormal iron-stuffed cells called "ringed sideroblasts" |
M9983/3 | Refractory anemia with excess blasts (RAEB) | characterized by 5–19% myeloblasts in the marrow |
M9984/3 | Refractory anemia with excess blasts in transformation (RAEB-T) | characterized by 5–19% myeloblasts in the marrow (>20% blasts is defined as acute myeloid leukemia) |
M9945/3 | Chronic myelomonocytic leukemia (CMML), not to be confused with chronic myelogenous leukemia or CML | characterized by less than 20% myeloblasts in the bone marrow and greater than 1*109/L monocytes (a type of white blood cell) circulating in the peripheral blood. |
(A table comparing these is available from the Cleveland Clinic. [56] )
Fanconi anemia (FA) is a rare, AR, genetic disease resulting in impaired response to DNA damage in the FA/BRCA pathway. Although it is a very rare disorder, study of this and other bone marrow failure syndromes has improved scientific understanding of the mechanisms of normal bone marrow function and development of cancer. Among those affected, the majority develop cancer, most often acute myelogenous leukemia (AML), MDS, and liver tumors. 90% develop aplastic anemia by age 40. About 60–75% have congenital defects, commonly short stature, abnormalities of the skin, arms, head, eyes, kidneys, and ears, and developmental disabilities. Around 75% have some form of endocrine problem, with varying degrees of severity. 60% of FA is FANC-A, 16q24.3, which has later onset bone marrow failure.
Tumors of the hematopoietic and lymphoid tissues or tumours of the haematopoietic and lymphoid tissues are tumors that affect the blood, bone marrow, lymph, and lymphatic system. Because these tissues are all intimately connected through both the circulatory system and the immune system, a disease affecting one will often affect the others as well, making aplasia, myeloproliferation and lymphoproliferation closely related and often overlapping problems. While uncommon in solid tumors, chromosomal translocations are a common cause of these diseases. This commonly leads to a different approach in diagnosis and treatment of hematological malignancies. Hematological malignancies are malignant neoplasms ("cancer"), and they are generally treated by specialists in hematology and/or oncology. In some centers "hematology/oncology" is a single subspecialty of internal medicine while in others they are considered separate divisions. Not all hematological disorders are malignant ("cancerous"); these other blood conditions may also be managed by a hematologist.
Chromosome 5q deletion syndrome is an acquired, hematological disorder characterized by loss of part of the long arm of human chromosome 5 in bone marrow myelocyte cells. This chromosome abnormality is most commonly associated with the myelodysplastic syndrome.
Lenalidomide, sold under the brand name Revlimid among others, is a medication used to treat multiple myeloma, smoldering myeloma, and myelodysplastic syndromes (MDS). For multiple myeloma, it is a first line treatment, and is given with dexamethasone. It is taken by mouth.
Azacitidine, sold under the brand name Vidaza among others, is a medication used for the treatment of myelodysplastic syndrome, myeloid leukemia, and juvenile myelomonocytic leukemia. It is a chemical analog of cytidine, a nucleoside in DNA and RNA. Azacitidine and its deoxy derivative, decitabine were first synthesized in Czechoslovakia as potential chemotherapeutic agents for cancer.
Sideroblastic anemia, or sideroachrestic anemia, is a form of anemia in which the bone marrow produces ringed sideroblasts rather than healthy red blood cells (erythrocytes). In sideroblastic anemia, the body has iron available but cannot incorporate it into hemoglobin, which red blood cells need in order to transport oxygen efficiently. The disorder may be caused either by a genetic disorder or indirectly as part of myelodysplastic syndrome, which can develop into hematological malignancies.
Diamond–Blackfan anemia (DBA) is a congenital erythroid aplasia that usually presents in infancy. DBA causes low red blood cell counts (anemia), without substantially affecting the other blood components, which are usually normal. This is in contrast to Shwachman–Bodian–Diamond syndrome, in which the bone marrow defect results primarily in neutropenia, and Fanconi anemia, where all cell lines are affected resulting in pancytopenia. There is a risk to develop acute myelogenous leukemia (AML) and certain other cancers.
Acute myeloid leukemia (AML) is a cancer of the myeloid line of blood cells, characterized by the rapid growth of abnormal cells that build up in the bone marrow and blood and interfere with normal blood cell production. Symptoms may include feeling tired, shortness of breath, easy bruising and bleeding, and increased risk of infection. Occasionally, spread may occur to the brain, skin, or gums. As an acute leukemia, AML progresses rapidly, and is typically fatal within weeks or months if left untreated.
GATA-binding factor 1 or GATA-1 is the founding member of the GATA family of transcription factors. This protein is widely expressed throughout vertebrate species. In humans and mice, it is encoded by the GATA1 and Gata1 genes, respectively. These genes are located on the X chromosome in both species.
Chronic myelomonocytic leukemia (CMML) is a type of leukemia, which are cancers of the blood-forming cells of the bone marrow. In adults, blood cells are formed in the bone marrow, by a process that is known as haematopoiesis. In CMML, there are increased numbers of monocytes and immature blood cells (blasts) in the peripheral blood and bone marrow, as well as abnormal looking cells (dysplasia) in at least one type of blood cell.
Decitabine, sold under the brand name Dacogen among others, acts as a nucleic acid synthesis inhibitor. It is a medication for the treatment of myelodysplastic syndromes, a class of conditions where certain blood cells are dysfunctional, and for acute myeloid leukemia (AML). Chemically, it is a cytidine analog.
Juvenile myelomonocytic leukemia (JMML) is a rare form of chronic leukemia that affects children, commonly those aged four and younger. The name JMML now encompasses all diagnoses formerly referred to as juvenile chronic myeloid leukemia (JCML), chronic myelomonocytic leukemia of infancy, and infantile monosomy 7 syndrome. The average age of patients at diagnosis is two (2) years old. The World Health Organization has included JMML as a subcategory of myelodysplastic and myeloproliferative disorders.
Acute megakaryoblastic leukemia (AMKL) is life-threatening leukemia in which malignant megakaryoblasts proliferate abnormally and injure various tissues. Megakaryoblasts are the most immature precursor cells in a platelet-forming lineage; they mature to promegakaryocytes and, ultimately, megakaryocytes which cells shed membrane-enclosed particles, i.e. platelets, into the circulation. Platelets are critical for the normal clotting of blood. While malignant megakaryoblasts usually are the predominant proliferating and tissue-damaging cells, their similarly malignant descendants, promegakaryocytes and megakaryocytes, are variable contributors to the malignancy.
Acute myelomonocytic leukemia (AMML) is a form of acute myeloid leukemia that involves a proliferation of CFU-GM myeloblasts and monoblasts. AMML occurs with a rapid increase amount in white blood cell count and is defined by more than 20% of myeloblast in the bone marrow. It is classified under "M4" in the French-American-British classification (FAB). It is classified under "AML, not otherwise classified" in the WHO classification.
Bone marrow failure occurs in individuals who produce an insufficient amount of red blood cells, white blood cells or platelets. Red blood cells transport oxygen to be distributed throughout the body's tissue. White blood cells fight off infections that enter the body. Bone marrow also contains platelets, which trigger clotting, and thus help stop the blood flow when a wound occurs.
Refractory cytopenia of childhood is a subgroup of myelodysplastic syndrome (MDS), having been added to the World Health Organization classification in 2008. Before then, RCC cases were classified as childhood aplastic anemia. RCC is the most common form of MDS in children and adolescents, accounting for approximately half of all MDS cases.
The Emberger syndrome is a rare, autosomal dominant, genetic disorder caused by familial or sporadic inactivating mutations in one of the two parental GATA2 genes. The mutation results in a haploinsufficiency in the levels of the gene's product, the GATA2 transcription factor. This transcription factor is critical for the embryonic development, maintenance, and functionality of blood-forming, lympathic-forming, and other tissues. The syndrome includes as its primary symptoms: serious abnormalities of the blood such as the myelodysplastic syndrome and acute myeloid leukemia; lymphedema of the lower limbs, and sensorineural hearing loss. However, the anomalies caused by GATA2 mutations are highly variable with some individuals showing little or no such symptoms even in old age while others exhibit non-malignant types of hematological anomalies; lymphedema in areas besides the lower limbs, little or no hearing loss; or anomalies in other tissues. The syndrome may present with relatively benign signs and/or symptoms and then progress rapidly or slowly to the myelodysplastic syndrome and/or acute myeloid leukemia. Alternatively, it may present with one of the latter two life-threatening disorders.
GATA2 deficiency is a grouping of several disorders caused by common defect, namely, familial or sporadic inactivating mutations in one of the two parental GATA2 genes. Being the gene haploinsufficient, mutations that cause a reduction in the cellular levels of the gene's product, GATA2, are autosomal dominant. The GATA2 protein is a transcription factor critical for the embryonic development, maintenance, and functionality of blood-forming, lymphatic-forming, and other tissue-forming stem cells. In consequence of these mutations, cellular levels of GATA2 are deficient and individuals develop over time hematological, immunological, lymphatic, or other presentations that may begin as apparently benign abnormalities but commonly progress to severe organ failure, opportunistic infections, virus infection-induced cancers, the myelodysplastic syndrome, and/or leukemia. GATA2 deficiency is a life-threatening and precancerous condition.
Transfusion-dependent anemia is a form of anemia characterized by the need for continuous blood transfusion. It is a condition that results from various diseases, and is associated with decreased survival rates. Regular transfusion is required to reduce the symptoms of anemia by increasing functional red blood cells and hemoglobin count. Symptoms may vary based on the severity of the condition and the most common symptom is fatigue. Various diseases can lead to transfusion-dependent anemia, most notably myelodysplastic syndromes (MDS) and thalassemia. Due to the number of diseases that can cause transfusion-dependent anemia, diagnosing it is more complicated. Transfusion dependence occurs when an average of more than 2 units of blood transfused every 28 days is required over a period of at least 3 months. Myelodysplastic syndromes is often only diagnosed when patients become anemic, and transfusion-dependent thalassemia is diagnosed based on gene mutations. Screening for heterozygosity in the thalassemia gene is an option for early detection.
Decitabine/cedazuridine, sold under the brand name Inqovi among others, is a fixed-dose combination anticancer medication used for the treatment of adults with myelodysplastic syndromes and chronic myelomonocytic leukemia (CMML). It is a combination of decitabine, a nucleoside metabolic inhibitor, and cedazuridine, a cytidine deaminase inhibitor.