Frequency of treatment failure during the first year after diagnosis and two-year, event-free survival in pediatric ALL at the IMIP in Recife, Brazil, both before (1980-1989) and after (1994-2002) establishment of a twinning program.From The New England Journal of Medicine, Raul C. Ribeiro and Ching-Hon Pui, Saving the Children — Improving Childhood Cancer Treatment in Developing Countries, 352, 2159. Copyright © (2005) Massachusetts Medical Society. Reprinted with permission from Massachusetts Medical Society.