Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Leukemia ?
    ### Response:
    Myeloma and lymphoma are other types of blood cancers. Both are common among older adults and occur more often in men than women. Myeloma affects plasma cells, a type of white blood cells typically found in the bone marrow. Lymphoma starts in the lymphatic system, which is part of the body's immune system.
    