Leukemia refers to the group of cancers that arise in the bone marrow. It results in the production of a high number of abnormal white blood cells. There are four chief kinds of leukemia- acute lymphoblastic leukemia, chronic lymphocytic leukemia (CLL), acute myeloid leukemia and chronic myeloid leukemia. The risk factors for leukemia are ionizing radiation exposure, prior chemotherapy, Down syndrome and smoking. Leukemia manifests with symptoms such as bruising and bleeding, fever, frequent infections, and persistent tiredness. The diagnosis of leukemia is typically determined through a bone marrow biopsy and blood tests. Its treatment involves a combination of targeted therapy, radiation therapy, chemotherapy and bone marrow transplant. Besides these, supportive and palliative care may also be provided. This book explores all the important aspects of leukemia in the present day scenario. The various studies that are constantly contributing towards the management of leukemia are examined in detail. The readers would gain knowledge that would broaden their perspective about oncology and oncological medicine.