Where can I find statistics about childhood leukemia for the u.S?

Seer database or ACS. The seer database is available online and publishes all this data. The leukemia and lymphoma society and american cancer society.
Cancer Statistics. This journal article summarizes the statistics on most cancers in the United States. See link at http://onlinelibrary.Wiley.Com/doi/10.3322/caac.20138/full.