Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the stages of Hairy Cell Leukemia ?
    ### Response:
    Key Points
                    - There is no standard staging system for hairy cell leukemia.
                
                
                    There is no standard staging system for hairy cell leukemia.
                    Staging is the process used to find out how far the cancer has spread.
    