结直肠癌是最常见的恶性肿瘤之一，近年来靶向治疗的成功应用为大肠癌病人带来了新的希望。针对血管内皮生长因子（VEGF）和表皮生长因子受体（EGFR）的单克隆抗体（贝伐单抗和西妥昔单抗）已在临床上广泛应用。靶向治疗药物可明显改善晚期病人的存活率和生存质量。各国学者的多项临床和实验研究表明:西妥昔单抗与细胞毒药物联合应用可明显提高疗效，且其疗效与病人的k?ras基因突变发生率明显相关。

Progression of targeted therapy for colorectal cancer        LIN Feng, LI Yong. Guangdong Provincial People's Hospital ， Guangdong Province Academy of Medical Sciences, Guangzhou 510080, China
Corresponding  author：LIN Feng，E-mail: liyong-lucky@21cn.com
Abstract    Colorectal cancer is one of the most common malignant tumors but the results of conventional chemotherapy have been discouraging. The recent successful development of targeted therapy has brought new hope for patients with colorectal cancer. Two monoclonal antibodies, bevacizumab and cetuximab, that block vascular endothelial growth factor and epithelial growth factor receptor are available widely in clinical practice. The addition of cetuximab or bevacizumab to the chemotherapy  for metastatic colorectal cancer  further improves the outcome.  The combination of chemotherapy with cetuximab or bevacizumab has become standard regimens in advanced colorectal cancer and makes a striking step to prolong the survival time in the past few years. The major achievement for the cetuximab targeted therapy of mCRC is the correlation between k-ras status and the efficacy of anti-EGFR therapy. Molecular targeted therapy plays a more important role in treatment for  colorectal  cancer.