Abstract
We reported an 11-year-old boy with chronic myelogenous leukemia having t (2; 9) (p13; q34) who was admitted to our hospital with complaint of short stature. Breakpoint cluster region (BCR) rearrangement was shown to be negative by Southern blot hybridization, but chimeric BCR-ABL mRNA was detected. He achieved complete remission by α-interferon and hydroxyurea and allogeneic bone marrow transplantation successfully performed.