The purpose of this study is to estimate, with pre-specified precision, the difference in local-regional control (LRC) rate at 2 years in subjects receiving chemoradiotherapy (CRT) or panitumumab plus radiotherapy (PRT) as first line treatment for locally advanced squamous cell carcinoma for the head and neck (SCCHN). A formal hypothesis will not be tested in this trial; however, the treatment arm difference in LRC rates at 2 years will be estimated.