Leukemia is a type of cancer that affects the blood and bone marrow, , The bone marrow is the spongy tissue inside bones where blood cells are made, , The cancer mainly affects the white blood cells, , The body produces abnormal white blood cells that do not work properly, , The unhealthy cells grow and multiply very quickly, , The unhealthy cells crowd out the healthy red blood cells and platelets, , It makes it harder for the body to carry oxygen, , It also makes it difficult for blood to clot properly, , The body becomes weaker at fighting infections, .

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