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    Day Care May Lower Risk of Childhood Leukemia

    Exposure to More Children, More Infections Could Be Link

    WebMD Health News

    April 21, 2005 -- Kids in day care may have a lower risk of developing childhood leukemia, a blood cancer.

    A new study provides further support that social activity with other children during the first few months of life protects against later risk of leukemia, say C. Gilham and colleagues.

    What's Behind Day Care-Leukemia Link?

    What's the apparent link between day care and leukemia risk? It's thought to be infections, say the researchers.

    The idea that infections are behind the cause of childhood leukemia dates back to the 1940s.

    Leukemia is cancer of white blood cells, immune system cells that fight off infection. In leukemia the bone marrow produces abnormal white blood cells that do not work normally. As the number of abnormal cells grows, they crowd out other blood cells, including normal white blood cells, red blood cells, and platelets. This overcrowding is what leads to symptoms, such as fatigue and bleeding, and can lead to death.

    Cancer Success Story

    Survival from leukemia varies widely depending on the type. Most children with leukemia have ALL (acute lymphoblastic leukemia).

    The improvement in survival for children with ALL over the past 35 years is one of the great success stories of cancer treatment, according to the National Cancer Institute. Today, about 85% of children with ALL live five years or more. Five years is considered the cutoff by cancer experts that indicates likely long-term survival after cancer.

    In the current study, Gilham looked at 3,800 children with cancer. Some of the kids had leukemia -- either ALL or another type -- and some had other forms of cancer. They were between 2 and 5 years old when they were diagnosed. Social activity and day care habits were compared with 7,600 children without cancer.

    Formal Day Care Protects Most

    Interaction with an older infant at least once a week that did not live in the same home was associated with a 34% decreased risk of ALL. Protection from other types of leukemia was similar.

    When other types of cancer were taken together there was also a similar level of protection. However, when individual types of cancer were evaluated, risk was decreased only for central nervous system cancers, such as brain cancer.

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