SEER is an authoritative source of information on cancer incidence and survival in the United States. SEER currently collects and publishes cancer incidence and survival data from population-based cancer registries covering approximately 28 percent of the U.S. population.
A neoplasm of lymphoblasts committed to the B lineage whose blasts contain <46 chromosomes. A stricter definition of <45 chromosomes, and possibly even <44 chromosomes more accurately reflects the clinical pathologic entity.
This disease is seen in both children and adults, although near haploid ALL (23-29 chromosomes) appears limited to childhood.