Book excerpt: Leukemia is a hematologic malignancy arising from hematopoietic stem cells (HSCs) in the bone marrow. Starting with a detailed description of hematopoiesis and what goes wrong in leukemia, this concise guide covers all aspects of the four most common subtypes of the disease. Although the incidence and prevalence of leukemia are rising worldwide, survival rates are also increasing. However, both the effects of the disease and the adverse effects of treatment remain complex challenges. Yet, as our understanding of the molecular landscape increases, therapeutic options are becoming more personalized. This revised and updated second edition of 'Fast Facts: Leukemia' addresses the causes and risk factors for each subtype of leukemia, the initial and confirmatory diagnostic tests, and the latest treatment options. Designed as a comprehensive primer for physician assistants, nurse practitioners, primary care providers, oncology nurses, hematology/ oncology trainees and pharmacists, this resource will help the non-specialist and those in training to identify leukemia early and provide a thorough understanding of the pathology and genetic basis of the disease, treatment options, and effective approaches to emergency and supportive care. Table of Contents: • Understanding blood and its components • What is leukemia? • Epidemiology, etiology and risk factors • Diagnosis • Staging and general management • Supportive care • Emergencies in leukemia