The first step in this study is to examine the tumor biopsy (previously collected) and determine whether or not it is epidermal growth factor receptor (EGFR) positive or EGFR negative. Both EGFR positive and EGFR negative patients can participate in this study because at this time it is not known whether having a negative or positive receptor makes a difference in how the study drug works on the tumor. By knowing if the tumor is EGFR positive or negative, we will be able to see if there is a difference in the way the tumor responds to cetuximab.