<qa>  What is the name of the drug used in chemotherapy?RATIONALE: Drugs used in chemotherapy use different ways to stop cancer cells from dividing so they stop growing or die. Colony-stimulating factors such as filgrastim and sargramostim may increase the number of immune cells found in bone marrow or peripheral blood and may help a persons immune system recover from the side effects of chemotherapy. It is not yet known whether combination chemotherapy is more effective followed by filgrastim or sargramostim in treating leukemia. 