1. Acute lymphocytic leukemia (ALL) : Causes, incidence, and risk factors  (Trust Mark: Doctor-Reviewed)
ALL makes up 80% of childhood acute leukemias. Most cases occur in children ages 3 - 7. The disease may also occur in adults. In acute leukemia, cancerous cells multiply quickly and replace normal cells. Cancerous cells take over normal parts of t...• Reviewer: David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; and Yi-Bin Chen, MD, Leukemia/Bone Marrow Transplant Program, Massachusetts General Hospital. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.