Leukaemia is commonly known as blood cancer with fatal characteristics. The age standardize rate of cancer in India is 60 to 90%. Epidemiology played an imperative role to understand the causes of diseases and its geographical prevalence which provides the opportunity to draft the policy and treatment strategies. In this book, an attempt is made to identify an epidemiological characteristic of leukemia patients of Gujarat state. This is the endeavor to describe the age-specific occurrence, deviation of hematological and biochemical parameter and genetic mutation of four main types of leukaemia (Chronic myeloid leukaemia CML; Chronic lymphoid leukaemia, CLL; Acute lymphoid leukaemia, ALL and Acute myeloid leukaemia, AML).