Acute lymphocytic leukemia (ALL) is a type of cancer that affects the blood and bone marrow. It is the most common type of leukemia in children, but it can also occur in adults. ALL is characterized by the rapid production of immature white blood cells, called lymphoblasts, which crowd out healthy blood cells.
The prevalence of ALL varies depending on age and geographical location. In the United States, ALL accounts for about 20% of all childhood cancers, with an estimated 3,100 new cases diagnosed each year. It is more common in children aged 2-5 years, and boys are slightly more affected than girls. In adults, ALL is relatively rare, accounting for about 0.4% of all cancers.
Worldwide, the prevalence of ALL differs across regions. It is more common in developed countries, such as the United States and Europe, compared to developing countries. The incidence rates also vary among different ethnic groups.
Early detection and advances in treatment have significantly improved the prognosis for ALL. The five-year survival rate for children with ALL is around 90%, while the rate for adults is lower, ranging from 30-50% depending on various factors.