What is leukaemia?
Normal healthy white blood cells are cells made in the bone marrow, which is the spongy tissue inside bones. They circulate in the blood and help protect the body from infection by foreign substances and disease. Leukaemia is abnormal and uncontrolled growth of immature white blood cells in the bone marrow, which then appear in the blood stream. 'Leuk' means white and 'aemia' means blood, which is why it is called leukaemia. These abnormal cells take up space in the bone marrow, which means the marrow can't make enough normal blood cells.