Cancer that starts in blood-forming tissue such as the bone marrow, and causes large numbers of blood cells to be produced and enter the bloodstream.

Abetalipoproteinemia (also known as Bassen-Kornzweig syndrome) is an inherited disorder that affects how fats are made and used in the body. The body needs fats for healthy nerves, muscles, and digestion. Like oil and water, fats can't travel in the blood around the body by themselves-they just don't mix in. Fats attach to special proteins called lipoproteins to travel to wherever they're needed.