 7. For patients that had been treated with one of the study medications will be allowed as long as the treatment did not contain more than 2 study medications at the same time. For example, irinotecan and capecitabine combination will be allowed but not irinotecan and cetuximab. Similarly, gemcitabine with cetuximab will be allowed but not gemcitabine, oxaliplatin and cetuximab. Treated with irinotecan alone followed by oxaliplatin will be allowed but not when irinotecan was in combination with oxaliplatin. 