Erlotinib Completed Phase 1 Trials for Stage IIIB Rectal Cancer / Stage IIIC Rectal Cancer / Recurrent Colon Cancer / Mucinous Adenocarcinoma of the Colon / Recurrent Rectal Cancer / Stage IVB Rectal Cancer / Signet Ring Adenocarcinoma of the Rectum / Stage IIIA Colon Cancer / Stage IIIC Colon Cancer / Stage IVA Rectal Cancer / Mucinous Adenocarcinoma of the Rectum / Signet Ring Adenocarcinoma of the Colon / Stage IIIB Colon Cancer / Stage IVA Colon Cancer / Stage IVB Colon Cancer / Stage IIIA Rectal Cancer Treatment