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Treatments for Thalassemia

Increased understanding of thalassemia and careful medical management have transformed a disease that once was usually fatal into a chronic illness that requires varying degrees of medical care.
Treatments for thalassemia range for each form of the illness. Milder versions of the disorder may call for no treatment except medical monitoring and perhaps genetic counseling as patients approach adulthood. More serious forms of thalassemia may require occasional or regular blood transfusions and chelation therapy to remove excess iron. Sometimes removal of the spleen is indicated.
Careful monitoring of thalassemia patients, particularly those who have significant anemia or who require regular transfusions, is essential to preserve health and well-being. In addition to hematologists, thalassemia patients may require the care of a number of medical specialists who understand the disease and its particular implications. Specialists may include: cardiologists, endocrinologists, gastroenterologists, audiologists, ophthalmologists, infectious disease specialists, bone marrow transplant physicians and genetic counselors.
Treatments for thalassemia may include:

Transfusion
Chelation therapy
Genetic counseling
Stem cell transplantation

Transfusion

Patients with thalassemia major receive regular blood transfusions in our outpatient transfusion unit. They are seen at these visits by the nurse practitioner who works full-time with our team and by Dr. Cunningham, the Director of the Thalassemia Program.

Chelation therapy

Blood transfusions, essential for the survival of some people with thalassemia, can cause an excess of iron in the body. Chelation, a treatment to remove this extra iron, is necessary to prevent the significant complications that can result from iron overload. Presently, chelation with subcutaneous (under the skin) deferoxamine is the only approved chelation or iron-binding therapy in this country. A promising new oral iron chelator, deferasirox (Exjade®), has been studied at many centers, including Children's Hospital Boston, and the data have been submitted to the FDA for approval. If this is approved, it would allow patients to take a medication by mouth to get rid of the extra iron.

Genetic counseling

The Thalassemia Program offers genetic counseling to patients and families with thalassemia syndromes who are planning to have children. This helps clarify the possible genetic combinations and the likelihood of having a child with a severe form of the disease. We also work closely with the geneticists and in vitro fertilization experts at Brigham and Women's Hospital to provide pre-implantation genetic diagnosis (determining the genetics of the fertilized embryo) or standard prenatal diagnosis, to parents who choose this service.

Stem Cell Transplantation

Patients who have severe forms of thalassemia and a sibling who is a bone marrow match can be treated and cured with a hematopoietic stem cell transplant (HSCT). Many people have heard of bone marrow transplant (BMT), which is a form of HSCT. HSCT is a very complex treatment, and not all children with thalassemia are candidates for this therapy. This treatment requires a genetically-matched sibling donor and carries the typical risks associated with stem cell transplantation. We recommend that all patients with thalassemia major and siblings have testing to determine if there is a match, and then evaluate the risks and benefits to make an informed decision.

If families decide to pursue stem cell transplantation, we will arrange a meeting with the Dana-Farber/Children's Hospital Cancer Care Pediatric Stem Cell Transplantation Program. Its stem cell transplantation team, which includes pediatric specialists from Dana-Farber Cancer Institute and Children's Hospital Boston, performs approximately 80 transplants each year.

Stem cell transplantations are performed in the 13-bed pediatric stem cell transplantation unit at Children's Hospital Boston, while new patient, consultative services and post-transplant care appointments take place at Dana-Farber Cancer Institute's Jimmy Fund Clinic.

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Thalassemia Minor: Understanding the Silent Carrier

Introduction: Thalassemia is a genetic blood disorder characterized by abnormal hemoglobin production, leading to anemia. Thalassemia minor, also known as thalassemia trait or carrier state, is the mildest form of thalassemia. Individuals with thalassemia minor typically have one normal hemoglobin gene and one mutated hemoglobin gene. Although it is considered a mild condition, understanding thalassemia minor is crucial due to its implications for genetic counseling and potential complications during pregnancy. Genetic Basis and Inheritance: Thalassemia minor is inherited in an autosomal recessive manner, meaning that both parents must carry the gene mutation for their child to have thalassemia minor. The mutated genes affect the production of either the alpha or beta globin chains that make up hemoglobin, the protein responsible for carrying oxygen in the blood. The severity of thalassemia is influenced by the specific gene mutation and the extent to which the normal gene is affected.

Diagnosis

Thalassemia can be diagnosed in different ways. Some types can be found on routine blood tests that show that the red blood cells are small or the patient is anemic. Testing of parents can be done before pregnancy to determine whether there is a risk of having a child with a severe form of thalassemia. The illness can be seen in sophisticated genetic testing, and can be found prenatally through amniocentesis or chorionic villus sampling (CVS).

Alpha Thalassemias

Four genes (two from each parent) are needed to make enough alpha globin protein chains. If one or more of the genes is missing, you will have alpha thalassemia trait or disease. This means that you don't make enough alpha globin protein. * If you have only one missing gene, you're a silent carrier and won't have any signs of illness. * If you have two missing genes, you have alpha thalassemia trait (also called alpha thalassemia minor). You may have mild anemia. * If you have three missing genes, you likely will have hemoglobin H disease (which a blood test can detect). This form of thalassemia causes moderate to severe anemia. Very rarely, a baby will have all four genes missing. This condition is called alpha thalassemia major or hydrops fetalis. Babies with hydrops fetalis usually die before or shortly after birth.