The electronic textbook "Pediatric oncology for medical students” provides a comprehensive overview of the age-specific differences between pediatric tumors and tumors of the adult age, importance of the age for diagnosis of cancer in childhood, factors influencing treatment decisions and the risks of anticancer therapy.. General section of the textbook provides a concise overview of the fundamental differences between pediatric and adult oncology, age specific clinical presentation of of the most common pediatric tumors, basic diagnostic procedures and treatment modalities of malignant diseases and last but not least the importance of organisation and centralisation of pediatric oncology on national and international level. Special section of the textbook offers an overview of the common and rare malignant tumors in children from epidemiology, etiology, clinical presentation, diagnostic procedures, differential diagnosis to treatment modalities and prognosis. The third section is devoted to emergencies and acute toxicity of anticancer treatment in pediatric oncology. The last section of the textbook offers the review of the most common late consequences and late effects in childhood cancer survivors. The textbook is designed as a basic information of principles and practices in pediatric oncology for pregradual students of medical faculty. The main goal of textbook is the understanding and basic knowledges of the pediatric tumors. Another aim of the textbook is to learn students how to work with literature and literature database search.