Isotretinoin, Interferon Alfa, and Vitamin E in Treating Patients With Stage III or Stage IV Head and Neck Cancer
['Isotretinoin, Interferon Alfa, and Vitamin E in Treating Patients With Stage III or Stage IV Head and Neck Cancer', 120, 'Puerto Rico', 'Phase III Randomized Study of Adjuvant Biologic Therapy in Patients With Stages III/IV Head and Neck Squamous Cell Carcinoma']