Not enough new blood cells (mainly red blood cells) are produced and the cells that are formed are not healthy and do not function properly. AA is not a type of cancer.
These are a group of blood disorders (there are many types) that are related to leukaemia, but are not cancerous.
Too many blood cells are produced in the bone marrow, but is is not known why. These new blood cells are defective and cannot perform their functions properly. MDS is not a a type of cancer.