Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Nasopharyngeal Cancer ?
    ### Response:
    Key Points
                    - Nasopharyngeal cancer is a disease in which malignant (cancer) cells form in the tissues of the nasopharynx.    - Ethnic background and being exposed to the Epstein-Barr virus can affect the risk of nasopharyngeal cancer.     - Signs of nasopharyngeal cancer include trouble breathing, speaking, or hearing.
    