Current status: Children oncology is a field which has become an important part of medicine and thanks to its development it is possible to heal up to 80% of children oncological patients. In the children oncology, we can meet many kinds of cancer such as Hematopoietic Tissue tumors, Lymphomas and Central nervous system tumors. Children are usually cured using chemotherapy which has not only therapeutically effects, but also unwanted symptoms which decrease the quality of patient lives and can be even dangerous for children. Main aim of my bachelor thesis is to describe the core principles of the nursing childcare during chemotherapy and to set the basic rules concerning the right vein entry care as well as the principles of the right appl...