Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the treatments for Hairy Cell Leukemia ?
    ### Response:
    Key Points
                    - There are different types of treatment for patients with hairy cell leukemia.     - Five types of standard treatment are used:         - Watchful waiting     - Chemotherapy      - Biologic therapy     - Surgery      - Targeted therapy        - New types of treatment are being tested in clinical trials.
    