Below is an instruction from Human. Write a response.
    ### Instruction:
    Who is at risk for Leukemia? ?
    ### Response:
    In many cases, no one knows why some people develop leukemia and others do not. However, scientists have identified some risk factors for the disease. A risk factor is anything that increases a person's chances of developing a disease. Most people who have known risk factors do not get leukemia, while many who do get the disease have none of these risk factors.
    