Final answer:
Childhood leukemia is associated with excessive proliferation of white blood cells.
Step-by-step explanation:
Childhood leukemia is associated with excessive proliferation of white blood cells. Leukemia is a type of cancer that affects blood cells and usually starts in the bone marrow, where blood cells are produced. In childhood leukemia, abnormal blood cells, mostly white blood cells, are produced in large quantities, replacing normal blood cells over time. This excessive proliferation of white blood cells can lead to symptoms such as fatigue, frequent infections, and easy bruising or bleeding.