A comprehensive clinical study has been provided in this book regarding the disease of acute lymphoblastic leukemia. This book presents different aspects of acute lymphoblastic leukemia. It discusses facets of molecular epidemiology and molecular features that control the origin and diagnosis of the disease. The diagnostic approaches are explained in detail, emphasizing the utilization of molecular biology in identifying the complications at initial stage in the patients. The authors have shared their research experiences, conclusions and prospective ideas. An offhand paradigm is added in the book which hypothetically explains the genesis of acute lymphoblastic leukemia especially in children. This book provides the reader with various molecular facets associated with leukemia and relative progression of the disease.