BACKGROUND The prognosis of adult patients with acute leukemia has continuously improved over the years due to the introduction of new diagnostic and therapeutic procedures and progress in the field of supportive therapy. METHODS This article gives an overview of the currently available options and the clinical approach to the diagnostics and therapy of acute leukemia. RESULTS The standardization as well as improvements in diagnostic procedures, in particular by immunocytological and genetic procedures, allow a more rapid determination of the exact diagnosis. In addition to age and performance status of patients, an established panel of cytogenetic and molecular markers allows an individual risk stratification for selecting the most appropriate therapeutic procedure for each patient. In acute myeloid leukemia (AML) younger patients with genetically determined intermediate and poor risk status benefit from allogeneic stem cell transplantation whereas patients in the low risk group are still primarily treated with conventional induction chemotherapy with anthracycline and cytarabine. The poor prognosis of elderly patients with AML has been improved by the development of stem cell transplantation procedures with reduced intensity conditioning and for patients not suitable for stem cell transplantation, the introduction of less toxic demethylating substances allows a substantial improvement in outcome and quality of life compared to cytoreductive therapy alone. The additional role of targeted therapies in AML is still under investigation. In adult patients with acute lymphoblastic leukemia (ALL), the standard systemic therapy still consists of complex cytotoxic regimens which have been modified from pediatric protocols. Biologically and genetically determined subgroups of ALL patients as well as poor responders, who can be identified by the detection of significant molecular determined residual disease (MRD) after standard therapy, benefit from allogeneic transplantation in first remission. In patients with bcr-abl positive ALL, the implementation of first and second generation tyrosine kinase inhibitors has led to rapidly rising response rates and less toxicity. Patients with relapsed ALL may benefit from new molecular options, e.g. bispecific antibodies. Additionally, improved standardization and supportive care, particularly due to the introduction of modern antimycotic agents, increase the treatment options and improve the prognosis of patients with acute leukemia. CONCLUSIONS The improved diagnostic and therapeutic options for patients with acute leukemia require a complex management. Currently only subgroups of patients benefit from molecular targeted therapeutic strategies. Due to this increasing complexity in the management, patients with acute leukemia should be treated in academic centers and within clinical trials.