Compassionate use: Their stories

When leukemia patient Christian Barker, center, received a bone marrow transplant, the donor cells attacked his body. By the time he was given permission to use an experimental drug, it was too late, his mother says. Christian died at age 14. "What haunts me is how my child suffered so much," says Sandy Barker.

When leukemia patient Christian Barker, center, received a bone marrow transplant, the donor cells attacked his body. By the time he was given permission to use an experimental drug, it was too late, his mother says. Christian died at age 14. "What haunts me is how my child suffered so much," says Sandy Barker.