SCV-07 0.3mg/kg for Mouth sores

This is a phase 2b, double-blind, placebo-controlled, 4-arm, adaptive-design trial, initially stratified by cisplatin regimen, and then randomized 1:1:1:1. The study will be conducted in subjects receiving ChemoRT for the treatment of squamous cell carcinomas (SCCs) of the oral cavity, oropharynx, hypopharynx, or larynx. The study includes a treatment period of approximately 7 weeks, depending on the subject's prescribed radiation plan, and Week 1 and Week 4 post RT follow-up visits. It also includes a longer follow-up period of approximately 12 months to determine if there is an effect of SCV 07 on the tumor response to ChemoRT.