CALGB/SWOG 80405:Phase Ⅲ trial of irinotecan / 5-FU/leucovorin(FOLFIRI)or oxaliplatin / 5-FU/leucovorin(mFOLFOX6)with bevacizumab(BV)or cetuximab(CET)for patients(pts)with KRAS wild-type(wt)untreated metastatic adenocarcinoma of the colon or rectum(MCRC). ......