Putting the "h" and the "o" in hope. If we had one wish, it would be to make it so that no child would ever have to suffer from any kind of illness. Here at the Cook Children's Hematology and Oncology Center, we are working every day on medical treatments and research to help make the blood disorders and cancers that hurt children and teens, disappear. Learn more about our Hematology and Oncology team at Cook Children's.