- Biopsy and/or fine needle aspirate of the tumor is required prior to registration. Pathologically confirmed primary squamous cell cancer of the oral cavity, oropharynx, hypopharynx, larynx, or unknown primary confined to the head and neck; histological variants such as spindle cell carcinoma, poorly differentiated keratin-positive carcinoma, and lymphoepithelioma are included. Patients with nasopharyngeal and salivary gland tumors are ineligible.