sentence: Most oral cancers look very similar under a microscope and are called squamous-cell carcinoma.
sentences_before: Oral cancer' is any cancerous tissue in the mouth. It can present as a primary lesion in any of the tissues, by metastasis from a distant site of origin, or by extension from a neighboring anatomic structure, such as the nasal cavity. Oral or mouth cancer most commonly involves the tongue.
concept_name: oral cancer
headings: Oral cancer
categories: Cancer Diseases and disorders of the mouth