Leukemia

The term leukemia refers to cancers of the white blood cells (also called leukocytes or WBCs). Leukemias, as a group, make up about a quarter of all pediatric cancers. Luckily, with treatment, most children with leukemia will be free of the disease without it coming back.

Leukemias start in the bone marrow — the soft tissue found inside bones that produces blood cells. When a child is diagnosed with leukemia, it’s because the white blood cells in the body are producing abnormally. These cells (also known as blasts) start to crowd out the healthy cells in the bone marrow. Eventually, the healthy cells have no place to go, so they stop producing. When a child's body no longer produces enough healthy white blood cells it can cause anemia, swollen lymph nodes, and other symptoms of leukemia in children.

Leukemia is classified as being either acute (meaning it’s rapidly developing) or chronic (meaning it’s slowly developing). About 98% of pediatric leukemias are acute.

 
Types of Pediatric Leukemia
Types of leukemia in children include:
  • Acute lymphoblastic leukemia (ALL): This happens when too many lymphoblasts (a certain type of white blood cell) are produced.
    This is the most common type of leukemia, affecting nearly 60% of kids with leukemia.
  • Acute myelogenous leukemia (AML): This occurs when too many immature white blood cells (called myeloid blasts) are made.
    These leukemia cells are abnormal and can’t mature into normal white blood cells.
  • Chronic myelogenous leukemia (CML): This rare form of pediatric leukemia happens because there are too many mature white blood cells.

 
Signs and Symptoms of Leukemia in Children

Although the symptoms of leukemia in each individual child can vary, common symptoms of leukemia in children include:

  • anemia  (when the level of healthy red blood cells in the body becomes
    too low)
  • bleeding and/or bruising
  • frequent or reoccurring infections
  • bone and joint pain
  • abdominal pain
  • swollen lymph nodes (also called “swollen glands”)
  • difficulty breathing
  • excessive fatigue (more tired than usual)
  • poor appetite

IMPORTANT NOTE: Instances of the symptoms of leukemia in children listed above, either together or on their own, do not automatically mean that a child has leukemia or any other kind of cancer. Any or all of these symptoms could be a sign of something else.

 
Diagnosing Leukemia in Children

One of our Nemours pediatric hematologists-oncologists (doctors who treat blood disorders and cancers) will conduct a physical examination on your child to check for symptoms of leukemia in children such as signs of infection, anemia, abnormal bleeding, and swollen lymph nodes.

The doctor will also feel your child's abdomen to see if the liver or spleen is enlarged. We’ll also take a complete medical history by asking about your child’s symptoms, past health, your family's health history, any medications your child is taking, allergies, etc.

After this exam, the doctor will order a CBC (complete blood count) to measure the numbers of white cells, red cells, and platelets in your child's blood. Your child’s blood chemistries will also be checked.

Then, depending on what we find in the exam and blood tests, your child also may need a:

  • bone marrow biopsy and aspiration (when marrow samples are taken for testing, usually from the back of the hip)
  • lymph node biopsy (when lymph nodes are removed and examined under a microscope to look for abnormal cells)
  • lumbar puncture (also called a spinal tap, when a sample of spinal fluid is taken from the lower back and examined for evidence of abnormal cells. This test will show if the leukemia has spread to the brain and spinal cord.)

We know that tests can be scary – for you and your child. Whatever kind of tests your child might need, know that your Nemours pediatric leukemia care team will do everything we can to make the experience as comfortable as possible – physically and emotionally. We’ll give sedation or anesthesia as needed and offer support and guidance at every step.

Learn more about what to expect with certain medical tests »

 
Treating Leukemia in Children

Depending on your child’s age, overall health, extent of the disease, and other factors, treatment may include one or a combination of the following:

  • chemotherapy
  • radiation therapy   
  • blood or bone marrow transplant (also sometimes called a BMT, BBMT, stem cell transplant, or cord blood transplant)
  • medications/antibiotics
  • blood transfusions

At Nemours, we know that getting a cancer diagnosis can be very frightening and overwhelming for your whole family. That’s why Nemours’ board-certified pediatric hematologists-oncologists, specialty nurses, cancer researchers, and other cancer experts are focused on helping not only your child, but your family, as well.

From diagnosis to treatment (and beyond) we’ll be here to help guide your family through your pediatric leukemia journey – and to strive and hope, with you, for a better tomorrow.

Juvenile Myelomonocytic Leukemia (JMML)

About Leukemia

Leukemia is a type of cancer that affects the body's white blood cells (WBCs).

Normally, WBCs help fight infection and protect the body against disease. But in leukemia, WBCs turn cancerous and multiply when they shouldn't, resulting in too many abnormal WBCs, which then interfere with the body's ability to function normally.

Juvenile myelomonocytic leukemia (JMML) is a rare childhood cancer that usually occurs in children younger than 2 years old. In JMML, too many myelocytes and monocytes (two types of WBCs) are produced from immature blood stem cells called blasts. These myelocytes, monocytes, and blasts overwhelm the normal cells in the bone marrow and other organs, causing the symptoms of JMML.

Causes

The cause of JMML is unknown, but doctors do know that certain medical conditions — such as neurofibromatosis type 1 and Noonan syndrome — can make a child more likely to develop it.

Signs and Symptoms

JMML tends to progress slowly, so at first a child may have few if any symptoms. In fact, symptoms can take months or even years to develop.

The symptoms of all types of leukemia are generally the same and include:

  • fatigue and weakness
  • swollen lymph nodes
  • recurrent infections (such as bronchitis or tonsillitis)
  • fever
  • easy bruising
  • bone and joint pain
  • abdominal pain (caused by abnormal blood cells accumulating in organs like the kidneys, liver, and spleen)

Diagnosis

A doctor who suspects a child has leukemia may order tests that include:

  • Blood tests. Tests such as a complete blood count, liver and kidney function panels, and blood chemistries can give important information about the number of normal blood cells in the body and how well the organs are functioning. The blood cells will also be examined under a microscope to check for abnormal shapes or sizes.
  • Bone marrow aspiration. In this procedure, the doctor inserts a needle into a large bone, usually the hip, and removes a small amount of bone marrow to examine it for abnormal cells.
  • Imaging studies. These may include an X-ray, CT scan, MRI, or ultrasound to check for an enlarged spleen or liver, and also to rule out any other possible causes of a child's symptoms.
  • Lumbar puncture. Also called a spinal tap, this procedure uses a hollow needle to remove a small amount of cerebrospinal fluid (the fluid surrounding the brain and spinal cord) for examination in a lab.
  • Flow cytometry tests. By analyzing the properties of the cancer cells, doctors can determine the type of leukemia a child has. This is important because treatment varies among different types of leukemia.
  • Chromosomal tests. By analyzing DNA from the blood or bone marrow, doctors can determine the type of leukemia a child has. This is important because treatments may vary according to the type of leukemia.
  • Tissue typing or HLA (human leukocyte antigen) typing. If a child needs a stem cell transplant (also called a bone marrow transplant), this test helps doctors find a suitable stem cell donor. It works by comparing the proteins on the surface of a child's blood cells with the proteins on a potential donor's cells. The more "HLA markers" a child and donor share, the greater the chance that a transplant will be successful.

Treatment

Chemotherapy (the use of drugs to kill cancer cells) may be used to temporarily control JMML. However, effective treatment of JMML usually requires a stem cell (bone marrow) transplant.

This procedure involves destroying cancer cells and normal bone marrow and immune system cells with high-dose chemotherapy and then re-introducing healthy donor stem cells into the body. The new stem cells can rebuild a healthy blood supply and immune system.

Even though these therapies are the treatment of choice for kids with JMML, the disease remains difficult to cure. As a result, researchers are looking into the use of molecular-targeted therapies (medications that block the expansion of cancer cells by disrupting certain molecules or proteins needed for growth), which also may be an effective treatment.

Coping

Being told that your child has cancer can be a terrifying experience, and the stress of treating the disease can be overwhelming for any family.

Although you might feel like it at times, you're not alone. To find out about support that may be available to you or your child, talk to your doctor or a hospital social worker. Many resources are available that can help you get through this difficult time.

Reviewed by: Emi H. Caywood, MD
Date reviewed: March 2012