What is acute lymphocytic leukemia (ALL)?

What is acute lymphocytic leukemia (ALL)?

Acute lymphocytic leukemia (ALL) is a fast-growing blood cancer that forms in immature white blood cells called lymphocytes. It starts in the bone marrow (soft, spongy tissue inside bones), which is where white blood cells form.

ALL usually spreads quickly to other areas of the body, such as the spleen, liver, lymph nodes, testicles, brain and spinal cord.