Aaron Reid is lying in a hospital bed at the National Institutes of Health Clinical Center when doctors arrive to make sure he's ready for his experimental treatment.
"How's your night? Any issues?" asks Dr. Katherine Barnett, a pediatric oncologist, as they begin to examine Reid.
Reid, 20, of Lucedale, Miss., has been fighting leukemia since he was 9 years old. He has been through chemotherapy and radiation twice, a bone marrow transplant and two other treatments.