TY - JOUR AU - Cunningham, D TI - Cetuximab monotherapy and cetuximab plus irinotecan in irinotecan-refractory metastatic colorectal cancer JO - N Engl J Med IS - 04 VL - 351 PY - 2004 DO - 10.1056/NEJMoa033025 SP - 337 EP - 345 N1 - et al. ER -