OUTLINE: This is a randomized, double-blind, placebo-controlled, multicenter study. Patients are stratified according to disease stage (III vs IVA or IVB), tumor site (oral cavity or oropharynx vs hypopharynx or larynx), and radiotherapy technique used on study (intensity-modulated radiotherapy [IMRT] vs 3-dimensional conformal radiotherapy [3D-CRT]). Patients are randomized to 1 of 2 treatment arms.