A Phase 3, Multi-center, Randomized, Double-Blind, Placebo- Controlled Study to Assess the Efficacy and Safety of EN3285 for the Prevention or Delay to Onset of Severe Oral Mucositis in Patients With Head and Neck Cancer Receiving Chemoradiotherapy

Significant

Inclusion Criteria:

- 18 years and older

- newly diagnosed SCC of the oral cavity and/or oropharynx, and are intended for
treatment with ChemoRT.

- Have a clinical plan to receive a minimum of 60 Gy to the oral cavity and/or
oropharynx

- Chemotherapy: cisplatin

- Have a WBC ≥3500 per cubic millimeter

- Have a platelet count ≥100,000 per cubic millimeter

- Have adequate renal function as determined by the principal investigator prior to
enrollment

- Are willing and able to undergo oral assessments

- Have a Karnofsky Performance Status score ≥70

Significant Exclusion Criteria:

- Have OM or other oral conditions at study entry

- Plan to use Amifostine, Pilocarpine, Cevimeline or Bethanechol

- Are using a pre-existing feeding tube for nutritional support at study entry

- Plan to use any drug for the treatment or prevention of OM

- Have had any prior radiotherapy to the head and neck

- Have had prior chemotherapy within 6 months preceding enrollment

- Plan to have concurrent chemotherapy, other than those regimens specified under
inclusioncriteria

- Have received other investigational drugs in the 30 days preceding initiation of
study drug or during administration of study drug

- Have medical conditions that require the use of chronic steroid therapy

- Have the inability to undergo repeat treatments,