Aaron Reid is lying in a hospital bed at the National Institutes of Health 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 ever since he was nine years old. He's been through chemotherapy and radiation twice, a bone marrow transplant and two other treatments.