Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Squamous cell carcinoma of the head and neck ?
    ### Response:
    Cancers that are known collectively as head and neck cancers usually begin in the squamous cells that line the moist, mucosal surfaces inside the head and neck (for example, inside the mouth, the nose, and the throat). These squamous cell cancers are often referred to as squamous cell carcinomas of the head and neck.
    