RATIONALE: Colony-stimulating factors such as sargramostim may increase the number of immune cells found in bone marrow or peripheral blood and may help a person's immune system recover from the side effects of chemotherapy or radiation therapy. Giving sargramostim to the stem cell donor and the patient may reduce the chance of developing graft-versus-host disease following stem cell transplantation. PURPOSE: Clinical trial to study the effectiveness of sargramostim in decreasing graft-versus-host disease in patients who are undergoing donor stem cell transplantation for hematologic cancer or aplastic anemia.
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