Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Adult Soft Tissue Sarcoma ?
    ### Response:
    Key Points
                    - Adult soft tissue sarcoma is a disease in which malignant (cancer) cells form in the soft tissues of the body.    - Having certain inherited disorders can increase the risk of adult soft tissue sarcoma.    - A sign of adult soft tissue sarcoma is a lump or swelling in soft tissue of the body.
    