Abstract
Head and neck cancer (HNC), which includes cancers of the oral cavity, pharynx and larynx, is the sixth most common type of tumor and comprises about 6% of all cancers. More than 500,000 new cases and 300,000 deaths from HNC are expected per year all over the world. In Brazil, about 14,000 new cases are estimated for 2014, considering only tumors of the oral cavity. The risks of HNC are a…