Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Bone Cancer ?
    ### Response:
    Cancer that starts in a bone is uncommon. Cancer that has spread to the bone from another part of the body is more common.     There are three types of bone cancer:       - Osteosarcoma - occurs most often between ages 10 and 19. It is more common in the knee and upper arm.
    