AML may be classified in 8 sub-types based on FAB Classification (French-American-British Classification). FAB Classification is based on morphology and cytogenetic. Sub-types are M0 to M7, based on the type of leukemia cells and their maturity. Other classification system used is the one of the World Health Organization (WHO) that classifies the types of leukemia based on genetic/molecular alteration or existence of other potential factors impacting clinical prognosis. The Hospital General de Mexico classifies the leukemia types based on morphologic, immunophenotype, genetic and sometimes in molecular criteria.