MCT Photo/Chicago Tribune/William DeShazer
Cathy Risberg, right, a volunteer at Lutheran General, checks in on Grayson Cacal, 2, left, and his mother, Sara, of Chicago, with gifts from the "humor cart" at Lutheran General, Nov. 24, 2010. Cacal was being treated for leukemia.
MCT Photo/Los Angeles Times
This graphic shows how bone marrow is extracted to treat cancers.
MCT Photo/Dallas Morning News/Gary Payne
Brandy Chappell, center left, and Shirley Dupree embrace at the start of the 5th annual Leukemia & Lymphoma Society’s Light the Night Walk, Oct. 4, 2003, in Plano, Texas. Cancer survivors must deal with fears of recurrence, treatment side effects, long-term consequences and other challenges.