Lam Do holds his son Luke Do, 4, at their home in San Jose, Calif., on Thursday, Jan. 27, 2005. Luke Do was a lively 18-month-old awaiting the birth of his first sibling when he was diagnosed with a rare form of leukemia. The hopes of his parents, both doctors in San Jose, Calif., immediately turned to a bone marrow transplant, but they soon learned some distressing news - Luke's ethnic heritage made him a tough match. (AP Photo/Jakub Mosur)
