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- Childhood Acute Myeloid Leukemia
Leukemia is an umbrella term for cancers of the blood and the blood-forming tissues of the body. Though it is rare, pediatric acute myeloid leukemia (AML) is the second most common type of leukemia among children.
Leukemia is an umbrella term for cancers of the blood and the blood-forming tissues of the body. Though it is rare, pediatric acute myeloid leukemia (AML) is the second most common type of leukemia among children.
Blood cell creation
The body produces millions of blood cells each day. Most develop in the bone marrow, the spongy interior of bones that contains immature stem cells.?
In a healthy person, these immature stem cells first become either lymphoid stem cells or myeloid stem cells.
Lymphoid stem cells develop into white blood cells, which are immune system cells. They start by becoming immature white blood cells known as lymphoblasts, then mature into lymphocytes. The two types of lymphocytes that are usually involved in leukemia are B cells and T cells. B cells produce the antibodies responsible for attacking invading bacteria and viruses. T cells help alert other immune cells to the presence of infection or fight infection directly.
Myeloid stem cells also develop into white blood cells. The myeloid stem cells first become immature white blood cells known as myeloblasts. They then mature into monocytes and granulocytes, including neutrophils, all of which fight disease. Other myeloid stem cells develop into red blood cells, which carry oxygen throughout the body; and platelets, which help the blood clot.
Leukemia occurs when the DNA (the genetic instructions that control cell activity) of a bone marrow stem cell mutates at some point in its development. The cell becomes cancerous, begins multiplying rapidly and crowds out healthy cells in the blood and bone marrow. These diseased cells can also gather in specific parts of the body, including the liver, lymph nodes, spleen and skin.
How is leukemia classified?
The four most common types of leukemia are classified by the type of stem cell that has turned cancerous, either lymphoid or myeloid.
These diseases are also classified as either chronic or acute. Acute leukemia?impacts immature cells, preventing them from developing and carrying out their function. These cells tend to multiply rapidly, making acute leukemia more aggressive.?Almost all childhood leukemias are acute.
Chronic leukemia?involves mature or partially mature cells. These cells multiple more slowly, making chronic leukemia less aggressive than acute leukemia. Chronic leukemia is rare in children.
About childhood AML
AML develops from?myeloid stem cells, which produce red blood cells, platelets and?some types of?white blood cells.?
It occurs?after?a myeloid stem cell develops into?a?myeloblast. Myeloblasts should develop into?healthy?white blood cells, but in some?cases?they mutate?into leukemia cells?and cannot develop normally. These diseased cells?do not perform their job well.?They also multiply rapidly. As the disease progresses, the abnormal cells can crowd out healthy cells.
As a result, AML, like all leukemias, may cause patients to develop anemia or have a poor ability to clot blood.?It can severely weaken the patient¡¯s immune system, leading to frequent infections.?
There are several subtypes of AML. Many depend on different chromosome abnormalities of the cancer cells and the types of molecules these cells produce. These specific subtypes can impact a patient¡¯s treatment plan and outlook
While there are more than 20,000 AML diagnoses a year, less than 1,000 are in pediatric patients. Of these, most are made before age two. There is also a smaller spike in diagnoses among teenagers.
While AML is difficult to treat in adults, treatments are more successful for pediatric patients, with a five-year survival rate of approximately 68% for this patient group.
Childhood AML risk factors
A risk factor is anything that increases the chance of developing a disease. Knowing a disease¡¯s risk factors can be an important step towards catching it early. It's important to note that not everyone with risk factors will develop the disease.
Risk factors for childhood AML include:
- Family history: Having a sibling with leukemia, especially a twin, is a risk factor for developing AML.
- Myelodysplastic syndrome: In MDS, the bone marrow does not produce enough healthy blood cells. MDS can evolve into AML. Learn more about myelodysplastic syndrome.
- Genetic disorders: Individuals with certain genetic disorders are at a higher risk of developing AML. These include Down syndrome and hereditary cancer syndromes like Li Fraumini Syndrome. Learn more about hereditary cancer syndromes.
- Past treatment with chemotherapy or radiation therapy for a previous cancer. While these therapies are AML risk factors, their benefits as cancer treatments far outweigh their risks.
- Chemical exposure: Long-term exposure to benzene, a chemical used in the petroleum industry, can cause AML.
Some cases of leukemia can be passed down from one generation to the next. Genetic counseling may be right for you. Learn more about the risk to you and your family on our genetic testing page.
Learn more about childhood acute myeloid leukemia:
- Childhood acute myeloid leukemia symptoms
- Childhood acute myeloid leukemia diagnosis
- Childhood acute myeloid leukemia treatment
Learn more about pediatric clinical trials for childhood acute myeloid leukemia.
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Need a stem cell transplant? 4 tips to make your life easier
Cancer patients usually have to make some lifestyle adjustments to accommodate their treatment. That could mean anything from taking time off to recover from surgery to waking up early to get to chemotherapy infusions before heading in to work.?
Everyone¡¯s accommodations will look a little different, depending on the type of cancer they have, how advanced it is and their individual treatment plan.?
But what if you need a stem cell transplant to treat leukemia, lymphoma, myeloma or some other blood disorder??
Here are four suggestions to help you prepare for that procedure.
Know your stem cell transplants to manage your expectations
Stem cell transplants replace damaged or faulty blood cells with healthy cells. They do this by ¡°rebooting¡± the immune system with an infusion of new stem cells after the old ones have been destroyed (along with cancer cells) by chemotherapy. All stem cell transplants fall into one of two categories:?
- Allogeneic stem cell transplants use cells from a matched donor; these could come from a family member, umbilical cord blood or a completely unrelated individual.??
- Autologous stem cell transplants use your own cells.
Some patients think they can move forward with a transplant right away, even if they need a donor¡¯s cells. But that¡¯s not always the case.?
Even in the earliest stages of donor identification, there¡¯s a lot of waiting to find out if someone is a good match for you. Then, you have to find out if they are still willing and able to donate, as well as how soon they can have their stem cells extracted.
A lot of people who register for the are young college students with class schedules to work around. So, you might have to wait a few months until they get time off around the winter holidays, spring break or summer vacation.?
You¡¯ll need a place to stay
No matter which type of stem cell transplant you receive, you¡¯ll need to be isolated in the hospital for at least 30 days after the infusion. This is to protect you while the new cells engraft and start rebuilding your immune system.?
It can take a while for your immune system to bounce back completely after a stem cell transplant. So, you¡¯ll likely be asked to remain close to the hospital for at least a few more weeks ¡ª if not months ¡ª after you¡¯re discharged. This is so you can get back to the hospital quickly if you develop a fever, an infection or any other complication.?
If you¡¯re getting a stem cell transplant at MD Anderson, there are many lodging options in or near the Texas Medical Center, including hotels, apartments, and trailer parks. Some offer special or reduced rates for people seeking medical treatment.?
But if you¡¯re visiting Houston for the first time, you might need some help sorting through it all. Our social workers can help. You can request a referral through or contact Social Work directly for assistance.
Be prepared: Have a ¡®go bag¡¯ ready
There¡¯s a good chance you might be on ¡°stand-by¡± status if you¡¯re waiting for stem cells to be provided by someone else. So, the next time you hear from your care team could well be the minute the transplant is actually ready ¡ª and you¡¯ll need to get to the hospital ASAP.
That¡¯s why it¡¯s helpful to have a ¡°go bag¡± packed with the essentials: you can get to the hospital quickly. Recovery from a stem cell transplant could take a month or longer. So, pack a few meaningful personal items like photos and other keepsakes, to make your room feel homier and less like a hospital.
Get your house in order before you leave
Now that you know you¡¯ll need to be in a hospital for at least 30 days, what has to happen to make that possible? Do you need to set up automatic bill payments through your bank? Ask a neighbor to get the mail and mow your lawn? Make arrangements with friends or siblings for long-term child care?
Not everyone has the flexibility to work remotely, but if you do, now¡¯s the time to look into it. If not, at least make sure your application for job protection has been granted through the Family and Medical Leave Act.
Unfortunately, life doesn¡¯t stop just because you¡¯re getting a stem cell transplant. But if you plan ahead as much as possible, you can make your own life ¡ª and those of others¡¯ ¡ª much less stressful.
John Lugo is a social work counselor who leads a bi-monthly support group for stem cell transplant recipients and their caregivers.?
or call 1-877-632-6789.
Understanding allogeneic stem cell transplants: What you need to know
Stem cell transplants use healthy, immature cells to replace those that either aren¡¯t working properly in a person¡¯s bone marrow or have been destroyed by high-dose chemotherapy. They are often used to treat leukemia, lymphoma, myeloma and other blood disorders.??
There are two types of stem cell transplants:?
- Autologous stem cell transplants use a patient¡¯s own cells.??
- Allogeneic stem cell transplants use cells from a healthy donor.?
Why isn¡¯t everyone a candidate to use their own stem cells? Where do donor stem cells even come from? And, why is the risk of one particular side effect greater with allogeneic stem cell transplants than with autologous transplants??
Read on for the answers to these questions and more.?
Why isn¡¯t everyone a candidate to use their own stem cells for a transplant??
The type of stem cell transplant you¡¯re eligible for depends on:??
- your type of cancer?
- whether your bone marrow is healthy and cancer-free, and ?
- how your body responded to prior treatments, such as chemotherapy.??
Allogeneic transplants are the preferred type of transplant for blood cancers, such as leukemias, myelofibrosis, and sometimes lymphomas. If your bone marrow is also affected by the cancer and not healthy, we need the donor¡¯s immune cells to react against your cancer cells.??
Autologous transplants, on the other hand, are preferred when cancer is best treated with high-dose chemotherapy. This therapy often destroys the patient¡¯s bone marrow along with the cancer. We rebuild it by using your stem cells, which we collect beforehand.??
Where do donor stem cells come from?
Donor stem cells may come from one of three sources:?
- Blood relatives
- Unrelated adults (usually through the database) ?
- Umbilical cord blood??
But the goal is to try to find a fully matched donor, whether they¡¯re related to you or not.??
What makes someone a ¡®fully matched¡¯ donor?
A fully matched adult donor is someone whose human leukocyte antigens (HLA) are the same as yours. HLAs are two sets of proteins on the surface of our cells. We inherit them from our parents: one set from each. To be a ¡°perfect¡± match, an adult donor needs to have the exact same HLA proteins as you do. Their blood type doesn¡¯t matter.?
Umbilical cord blood, on the other hand, is still very ¡°na?ve,¡± in that it comes from a baby who was just born. So, its cells haven¡¯t been exposed to all of the same bacteria, viruses, fungi, allergens and other pathogens that adult immune systems have. The cord blood¡¯s HLA type does not need to fully match yours, though the more closely matched they are, the better.??
What are my chances of finding a fully matched adult donor?
That depends partially on the number of full siblings you have. There¡¯s a 25% likelihood of a full match between you and each one. But the odds of you finding a fully matched unrelated donor in the national donor registry depends on your ethnicity. Here is a breakdown of those figures:?
- White or European ancestry: 74%?
- Native American or Indigenous ancestry: 47%?
- Hispanic or Latino ancestry: <40%?
- Black or African American ancestry: 19%?
It is much harder for people of color to find a perfect match. That¡¯s why we urge members of those communities ¡ª especially younger people ¡ª to consider registering with the , formerly known as Be the Match.??
Are some people better candidates for allogeneic stem cell transplants than others?
Yes. But the criteria are complex. Important factors include whether your cancer is responding well to prior chemotherapy, how fit you are and the availability of a donor.??
The reason your body¡¯s response to chemotherapy is so important is that a donor¡¯s immune cells require several months to mount an attack against any residual cancer cells. So, if you still have too many at the time of transplant, they may overwhelm the donor¡¯s cells and not give them a fighting chance. This could cause the transplant to fail.?
What are the benefits of an allogeneic stem cell transplant?
An allogeneic stem cell transplant is what¡¯s known as a ¡°high-risk/high-reward¡± type of therapy.??
While the risk of developing a side effect known as graft vs. host disease (GVHD) is real and significant, an allogeneic stem cell transplant is also the only potential cure for diseases like acute lymphocytic leukemia, acute myeloid leukemia, myelodysplastic syndrome, and myelofibrosis and other myeloproliferative disorders.?
GVHD is extremely rare in autologous stem cell transplants because the donor stem cells are your own.?
What are the risks of an allogeneic stem cell transplant?
The biggest risks of allogeneic stem cell transplants are infections and GVHD.??
One of the most troublesome infections is caused by a pathogen called cytomegalovirus, or CMV. Just over half of all Americans have been exposed to it by age 40. But an anti-viral drug called letermovir has been available since 2017 to prevent its reactivation after a stem cell transplant.??
GVHD is when a donor¡¯s stem cells recognize the patient¡¯s normal body cells as ¡°other¡± and begin attacking it. We have a lot of good strategies available to prevent this, starting with finding the most well-matched donor. Another is the early use of a drug called cyclophosphamide, which targets the specific donor T cells that are more prone to reacting against the patient¡¯s normal cells and causing GVHD.??
How long does it take to fully recover from an allogeneic stem cell transplant?
That depends on several factors:? ?
- How long it takes a donor¡¯s cells to fully engraft, or establish themselves and start protecting you?
- How well you recover from the early side effects, and from GVHD, if it occurs?
- Whether other complications, such as infections, occur?
- Whether the cancer is still detectable early on, after a transplant??
But you should expect to stay in the hospital for at least 30 days after a transplant, and near the hospital for another two months. Data shows that acute GVHD or infections are most likely to happen within the first 90 days, so we want to be able to address them quickly if that happens.
Once you¡¯ve repeated all your childhood vaccinations, your immune system should be back to normal within about two years of a stem cell transplant.
What¡¯s the most important thing to know about allogeneic stem cell transplants?
One thing that surprises patients is how long it takes to recover. Some expect to feel normal again after just 30 days. But it can take six months or more for your energy levels, strength and even taste buds to bounce back.
, is a stem cell transplant specialist.
or by call 1-877-632-6789.
Acute myeloid leukemia: What to know
Acute myeloid leukemia (AML) is a cancer of the blood and bone marrow. ¡°Acute¡± means that this leukemia can progress rapidly if not treated, and ¡°myeloid¡± refers to the type of cell this leukemia starts from.
While AML typically occurs in adults with median age of 67, MD Anderson does treat many adolescent and young adult AML patients.?
If you or a loved one has been diagnosed with AML, you have many questions. We spoke with to get answers to some common questions he hears about AML.
What is leukemia?
Leukemia is the name for a very large, complex, diverse group of malignant tumors that arise from the bone marrow and involve the blood.?
Can you explain the different types of leukemia??
Leukemias are grouped by the type of cell affected and the rate of cell growth.
Acute leukemia involves an overgrowth of very immature blood cells. There are two main types of?acute leukemia:
- Acute lymphocyte leukemia (ALL)
- Acute myeloid (or myelogenous) leukemia (AML)
Chronic leukemia involves an overgrowth of mature blood cells. The main types of chronic leukemia are:
- Chronic lymphoblastic leukemia (CLL)
- Chronic myeloid (or myelogenous) leukemia (CML)?
We also treat many patients with other subtypes of leukemia, such as myelodysplastic syndrome (MDS), myeloproliferative neoplasms (MPN), aplastic anemia, blastic plasmacytoid dendritic cell neoplasm (BPDCN) and hairy cell leukemia.?
What are the symptoms of AML??
There is generally a wide range of symptoms and presentations. Some patients may not have many symptoms and may only be diagnosed through blood testing when presenting in the clinic, through the emergency room, or in the hospital.
Others may experience common symptoms, such as fatigue, fevers/infections, bleeding and easy bruising. Some patients may be so ill that they present directly through the emergency room to the intensive care unit.
Are some people more likely to develop AML?
The exact cause of AML is unknown.?Some associations/risk factors include:
- Exposure to ionizing radiation or specific chemical exposure
- Certain genetic/familial syndromes, such as familial platelet disorders with propensity to myeloid malignancies or inherited bone marrow failure syndromes
- Prior cancer treatment with either radiation or chemotherapy
- Patients with antecedent hematologic malignancy, such as MDS, MPN, aplastic anemia, BPDCN
How is AML typically treated?
Unfortunately, there¡¯s not yet a reliable, standard therapy for most patients with AML. Many patients undergo chemotherapy and/or a stem cell transplant, which is a procedure that replaces defective or damaged cells in patients whose normal blood cells have been affected by cancer.
But stem cell transplants often aren¡¯t an option for patients older than age 70, and some of the most common intensive chemotherapy regimens used for patients at younger ages may not work for all older patients. Often the best options may include a clinical trial.?
What clinical trials is MD Anderson offering for older AML patients?
At MD Anderson, we have a number of different AML clinical trials, some of which are part of our . Some of the frontline AML clinical trials we have for older patients include:
- A hypomethylator agent (such as Azacytidine, Decitabine or SGI-110) alone or with?another agent
- Novel clinical trial drugs alone or in combinations, including targeted therapies based on a particular patient¡¯s mutational profile (FLT3, IDH 1 or 2, or CD123, for example)
- Immunotherapy agents or immunotherapy in combination with chemotherapy
What other new research is on the horizon for AML??
Besides the clinical trials I just mentioned, we¡¯ll soon be looking at targeted therapy agents aimed at a particular molecular mutation or aberrant molecular pathways
Other approaches will soon include newer forms of immunotherapy, such as chimeric antigen receptor (CAR) T-cell therapy, bi-specific antibody therapies and others via upcoming clinical trials.
Why are patients with acute leukemia at increased risk of infection??
If the white blood cell count, specifically the neutrophil count, is very low, this can weaken the immune system¡¯s functioning and make it harder for a patient to fight off infections.
This can happen because of the leukemia itself or as a result of the cancer treatment. Generally, patients in active therapy may be placed on preventive antibiotics to help protect against some of the more common infections.
What¡¯s your advice for newly diagnosed AML patients??
Every patient is unique and each patient should have a serious conversation with their oncologist when diagnosed with AML. It¡¯s important that you receive treatment from someone with a lot of experience treating AML and who has access to the latest clinical trials. I encourage new AML patients to schedule an appointment with an experienced hematologist at a comprehensive cancer center such as?MD Anderson.
I also recommend finding out about your clinical trial options upfront, whether you have a new AML diagnosis or you have relapsed AML.
Why choose MD Anderson for childhood AML treatment?
Selecting a hospital is the first big choice a family makes after a cancer diagnosis. MD Anderson¡¯s Children¡¯s Cancer Hospital offers childhood leukemia patients the most advanced treatments from an expert team, along with support services designed to help the entire family through their cancer journey.
This journey starts with a highly detailed diagnosis of each patient¡¯s leukemia. Through the skills of our leading pathologists, MD Anderson is able to quickly pinpoint alterations in the cancer cells. This information can be used to develop treatment plans tailored to each individual patient.
These treatment plans are created by our multidisciplinary team of physicians working together to benefit each patient. Among these physicians are leading medical oncologists who focus exclusively on treating childhood leukemia and related conditions and specialists from one of the largest stem cell transplantation services in the country. Their expertise includes caring for the newly diagnosed, as well as patients whose leukemia has relapsed or not responded to treatment.
While here, pediatric leukemia patients have access to clinical trials for children, teens and even adults. In addition, the Children¡¯s Cancer Hospital offers supportive care services designed to improve your child¡¯s quality of life, such as counseling and symptom management.
Patients also have access to programs like our arts in medicine activities, summer camps and support groups. We even have an accredited, in-hospital school that helps patients meet their academic goals while in treatment.
If it weren¡¯t for MD Anderson, we never would have seen our child soar and become the outstanding young woman she is today.
Victoria Collins
Caregiver
Leukemia Treatment at MD Anderson
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