What Causes Childhood Leukemia?
Both major types of childhood leukemia—Acute lymphocytic (lymphoblastic) leukemia (ALL) and Acute myelogenous leukemia (AML)—begin in the bone marrow, the soft inner part of the bone where new blood cells are created. As the leukemia cells accumulate inside the bone marrow, they overwhelm the healthy cells, eventually spreading into the blood stream. Thus, leukemia is a blood-based cancer, and must not be confused with other types of childhood cancers that start in other parts of the body and eventually spread into the bone marrow.
Why do some blood cells in children grow into abnormal leukemia cells? In other words, what causes childhood leukemia? Unfortunately, we cannot yet answer that question. We do know that childhood leukemia, like most other childhood cancers, is not caused by environmental or lifestyle factors. Absent these factors, scientists and researchers do not know what causes certain cells within a child’s bone marrow to begin growing and functioning abnormally.
Increasingly, scientists are beginning to believe that many childhood cancers, including leukemia, are linked to mutations—or random, uncontrolled alterations—to the DNA found within normal bone marrow cells. Leukemia may be connected to a specific type of DNA mutation controlling the genes responsible for ensuring that cells divide, grow, replicate, and die properly. Another potential cause of childhood leukemia may be a form of genetic mutation called chromosome translocation, where DNA from one chromosome breaks off and becomes attached to a different chromosome. Again, if this mutation affects oncogenes and/or tumor suppressor genes, it may lead to the development of childhood leukemia or other types of childhood cancer.
What are the risk factors for childhood leukemia?
If it is true that genetic mutations are responsible for most cases of childhood leukemia, it is important to note that these genetic mutations are usually the result of random and unpredictable changes and are not linked to any known or inherited risk. However, there are a few inherited conditions which may result in a higher risk factor for some rare cases of childhood leukemia, such as:
- Inherited syndromes such as Down syndrome (trisomy 21) and Li-Fraumeni syndrome
- Inherited immune system problems such as Ataxia-telangiectasia, Wiskott-Aldrich syndrome, Bloom syndrome, and Schwachman-Diamond syndrome
- Having a sibling with leukemia, especially if the sibling is an identical twin
The one environmental factor that may pose an increased risk of childhood leukemia is exposure to extremely high levels of radiation (such as Japanese survivors of the 1945 atomic bombings). However, scientists are exploring any potential links between childhood leukemia and smaller dosages of radiation (like routine x-rays), as well as chemotherapy and exposure to toxic chemicals.
Can Childhood Leukemia Be Prevented?
Although we don’t yet know definitively what causes childhood cancer, we can say definitely that there is no way to prevent it, or as of right now, screen for it the way we can with many adult cancers. We can hope that as our understanding of the causes of leukemia and other childhood cancers improves, that knowledge brings with it a better understanding of how to detect the disease before it becomes the terrible threat that it poses today.
More about Childhood Leukemia Cancers:
- About Childhood Leukemia Cancer – Detection and Diagnosis
- Causes, Risk Factors, and Prevention of Childhood Leukemia Cancer
- What are the signs and symptoms of Childhood Leukemia Cancer?
- Childhood Leukemia Cancer Treatment
- What is the expected life span of Childhood Leukemia Cancer?
- After Treatment – Living as a Childhood Leukemia Cancer Survivor
Learn More About the Different Types of Childhood Cancers:
- Childhood Brain Tumor Cancer (Brain Stem Tumors)
- Spinal Cord Tumor Cancer
- Childhood Neuroblastoma Cancers
- Childhood Hodgkin Lymphoma Cancers
- Non-Hodgkin Lymphoma Cancers
- Wilms tumor (Kidney Tumors)
- Rhabdomyosarcoma
- Retinoblastoma
- Bone cancer (including osteosarcoma and Ewing sarcoma)
- Leukemia Cancers: Acute lymphocytic (lymphoblastic) leukemia (ALL) Acute myelogenous leukemia (AML); Juvenile myelomonocytic leukemia (JMML)
- Hepatoblastoma (Liver Cancer)
- Rhabdoid Tumors
About American Childhood Cancer Organization
American Childhood Cancer Organization (ACCO) is a non-profit charity dedicated to helping kids with cancer and their families navigate the difficult journey from cancer diagnosis through survivorship. Internationally, ACCO is the sole U.S. member of Childhood Cancer International (CCI), the largest patient-support organization for childhood cancer in the world. Here in the United States, ACCO promotes the critical importance of ensuring continued funding into new and better treatment protocols for childhood cancer. And most importantly, ACCO is focused on the children: developing and providing educational tools for children fighting cancer and their families, empowering them in their understanding of childhood cancer and the medical decisions they must make during this difficult journey. All of ACCO’s resources are available free of charge for families coping with childhood cancer.
For additional information about childhood cancer or on the ACCO, or to order resources for you or your child, please visit our website at www.acco.org , call 855.858.2226 or visit:
Leukemia is the most common form of childhood cancer today, accounting for nearly one-third of all childhood cancer diagnoses in the United States. A blood-based cancer that begins in the soft inner part of the bone called the bone marrow, childhood leukemia is classified into three different types. The most common type is Acute lymphocytic (lymphoblastic) leukemia (ALL), about 75% of all childhood leukemia diagnoses. ALL starts with abnormal cell growth among immature lymphocytes (white blood cells that help the body fight infection). About 25% of diagnoses are Acute myelogenous leukemia (AML), which begins with abnormal growth of myeloid cells (responsible for the growth of non-lymphocytic white blood cells, red blood cells, and platelets.) The third type of childhood leukemia—Juvenile myelomonocytic leukemia (JMML)—is extremely rare. Like AML, it develops in the myeloid cells and is acute (quickly growing) but it does not develop and spread as quickly as either AML or ALL.
Treatment for neuroblastoma can be long, difficult, and traumatic, not only for the patient but also for friends and family. Once treatment has ended and your child has been declared “cancer free”, it is very common for everyone—patient and family alike—to look forward to returning to “normal life.” And for the most part, it is possible to get back to a life that doesn’t revolve around childhood cancer. At the same time, however, it is important to recognize that childhood cancer has both short- and long-term consequences—both physical and emotional—that can continue to impact your child’s return to cancer-free normalcy.
Nearly one-third of all children and teens with cancer are diagnosed with childhood leukemia, making this form of childhood cancer by far the most common. Childhood leukemia is a cancer of the blood. It begins in the bone marrow, the soft interior of the bones responsible for the development of new blood cells. Leukemia cells in the bone marrow replicate more quickly than healthy cells, and do not die at the proper time, and eventually begin to crowd out healthy cells. As this happens, the cancerous cells enter the blood stream and quickly move around the body. As the leukemia cells invade other organs, they begin to impact the ability of those organs to function normally.
Any discussion of prognosis or outlook is usually based on five-year survival rates, or the percentage of children with a specific type of cancer who live at least five years after their initial diagnosis. These numbers are based on studies performed at least five years ago, and so may not reflect improvement in treatment options for some types of cancers. Moreover, these numbers are merely averages and do not indicate the outlook or prognosis for your specific child. Your child’s oncologist will be able to give you a better understanding of your child’s unique case based on his or her type of cancer, age, general health, and response to treatment.

In many cases, symptoms of neuroblastoma are caused by a tumor, or mass of cancerous cells, that becomes visible through the skin or begins to press on other organs of the body. The location of the primary tumor will impact the specific symptoms the child is experiencing. For instance:


