“Leukemia is a broad term for cancers of the blood cells. The type of leukemia depends on the type of blood cell that becomes cancer and whether it grows quickly or slowly. Leukemia occurs most often in adults older than 55, but it is also the most common cancer in children younger than 15.  There is Acute Lymphoblastic Leukemia, Acute Myeloid Leukemia, Chronic Lymphocytic Leukemia , Chronic Myelogenous Leukemia, Hairy Cell Leukemia, Childhood Acute Lymphoblastic Leukemia, and Childhood Acute Myeloid Leukemia.”

National Cancer Institute (https://www.cancer.gov/types/leukemia#: ~:text=Leukemia%20is%20a%20broad%20term,in%20children%20younger%20than%2015.)