Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Salivary gland cancer, adult ?
    ### Response:
    Salivary gland cancer is a rare disease in which cancerous cells form in the tissues of the salivary glands. The salivary glands make saliva and release it into the mouth. Saliva has enzymes that help to digest food and antibodies that help protect against infections of the mouth and throat.
    