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A risk factor is something that increases your chance of getting a disease such as cancer. Some risk factors, like smoking, can be controlled. Others, like a person’s age or family history, can’t be changed.
But having a risk factor, or even several risk factors, does not mean that you will definitely get the disease. And many people who get the disease may have few or no known risk factors.
There are only a handful of known risk factors for acute lymphocytic leukemia (ALL).
Being exposed to high levels of radiation is a risk factor for both ALL and acute myeloid leukemia (AML). For example, Japanese atomic bomb survivors had a greatly increased risk of developing acute leukemia.
Treating cancer with radiation therapy also increases the risk of leukemia, although more for AML than ALL. The risk seems to be higher if chemotherapy and radiation are both used in treatment.
The possible risks of leukemia from being exposed to lower levels of radiation, such as from medical imaging tests like x-rays or CT scans, are not well understood. Exposure to such radiation, especially very early in life, may carry an increased risk of leukemia, but this is not clear. If there is an increased risk it is likely to be small, but to be safe, most doctors try to limit radiation exposure from these tests as much as possible, especially in children and pregnant women.
The risk of ALL may be increased by exposure to certain chemotherapy drugs and certain other chemicals, including benzene. Benzene is used in many industries to make other products, and is also in cigarette smoke, as well as some glues, cleaning products, detergents, art supplies, and paint strippers.
Chemical exposure is more strongly linked to an increased risk of AML than to ALL.
Infection with the human T-cell lymphoma/leukemia virus-1 (HTLV-1) can cause a rare type of T-cell ALL. Most cases occur in Japan and the Caribbean area. This disease is not common in the United States.
In Africa, the Epstein-Barr virus (EBV) has been linked to Burkitt lymphoma, as well as to a form of ALL. In the United States, EBV most often causes infectious mononucleosis (“mono”).It has also been linked with a type of lymphoma that can occur after a stem cell transplant (known as post-transplant lymphoproliferative disorder, or PTLD).
ALL itself doesn't appear to have a strong inherited component. That is, it doesn't seem to run in families, so a person’s risk is not increased if a family member (other than an identical twin - see below) has the disease.But there are some genetic syndromes (some of which can be inherited from a parent) that seem to raise the risk of ALL. These include:
ALL is more likely to occur in children and in adults over the age of 50.
ALL is more common in White individuals than in African Americans, but the reasons for this are not clear.
ALL is slightly more common in males than in females. The reason for this is unknown.
Someone who has an identical twin who develops ALL in the first year of life has an increased risk of getting ALL.
Other factors that have been studied for a possible link to ALL include:
So far, none of these factors has been linked conclusively to ALL, but research in these areas continues.
Our team is made up of doctors and oncology certified nurses with deep knowledge of cancer care as well as journalists, editors, and translators with extensive experience in medical writing.
Appelbaum FR. Chapter 98: Acute Leukemias in Adults. In: Niederhuber JE, Armitage JO, Dorshow JH, Kastan MB, Tepper JE, eds. Abeloff’s Clinical Oncology. 5th ed. Philadelphia, Pa. Elsevier: 2014.
Jain N, Gurbuxani S, Rhee C, Stock W. Chapter 65: Acute Lymphoblastic Leukemia in Adults. In: Hoffman R, Benz EJ, Silberstein LE, Heslop H, Weitz J, Anastasi J, eds. Hematology: Basic Principles and Practice. 6th ed. Philadelphia, Pa: Elsevier; 2013.
National Cancer Institute. Childhood Acute Lymphoblastic Leukemia Treatment (PDQ®). Accessed at www.cancer.gov/types/leukemia/patient/child-all-treatment-pdq on July 19, 2018.
National Cancer Institute. SEER Cancer Stat Facts: Acute Lymphocytic Leukemia (ALL). Accessed at https://seer.cancer.gov/statfacts/html/alyl.html on July 18, 2018.
Last Revised: October 17, 2018