Study of Panitumumab Given First With Capecitabine and Oxaliplatin (CAPOX) and Then With Capecitabine and Radiation of the Pelvis for Treatment of Patients With Rectal Cancers That May or May Not Have Spread Beyond the Rectum

A Phase II Study to Determine the Efficacy and Safety of Panitumumab in Combination With Chemoradiotherapy for Unresectable or Locally Recurrent Adenocarcinoma of the Rectum With or Without Metastatic Disease