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The incidence of leukemia has risen from 30.2 cases per million in 1975 to 42.2 cases per million – 34 percent of all childhood cancers – in 2010. The cancer begins in the bone marrow, where oxygen-carrying red blood cells and infection-fighting white blood cells are born. Acute lymphocytic leukemia, the most common childhood leukemia, develops when healthy white blood cells, or lymphocytes, multiply wildly and crowd out normal cells. Brain cancer, on the other hand, occurs when cancerous cells begin massing into a tumor that invades healthy brain tissue. This can cause headaches, nausea, vomiting, or a change in vision, hearing, memory or balance. A relatively rare cancer overall, the rate of brain cancer has remained steady since the mid-'80s when MRIs were introduced and used to diagnose the disease. Brain tumors are more common among adults, yet they still are found in about 4,100 kids each year in the U.S.
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