This edition of the Manual of Pediatric Hematology and Oncology is the fourth
edition and the sixth book written by the author on pediatric hematology and oncol-
ogy. The first book written by the author 25 years ago was exclusively on pediatric
hematology and its companion book, exclusively on pediatric oncology, was written
3 years later. The book reviewers at the time suggested that these two books be com-
bined into a single book on pediatric hematology and oncology and the first edition
of the Manual of Pediatric Hematology and Oncology was published by the author
in 1989.