- Patients must have histologically or cytologically confirmed SCCHN that is recurrent and/or metastatic and not amendable to curative therapy by surgery or radiation; SCCHN originating from the following sites are eligible: oral cavity, oropharynx, larynx, hypopharynx and paranasal sinus; for patients with a diagnosis of SCCHN of unknown origin, their eligibility must be reviewed and approved by the principal investigator