Overview: Leukemia is a cancer that generally forms in blood cells or bone marrow. In most instances, leukemia form in white blood cells, which assist the body, fight infections. The disease usually takes place in older adults, but it also is the most common cancer in younger children. Leukemia has many kinds, and the disease can be acute, or rapid-growing, or chronic, or sluggish-growing. Exclusive forms of leukemia might also require distinctive treatments. Leukemia...