易瑞沙（吉非替尼）是一种新型的小分子量肿瘤治疗药物，其作用机制主要是通过抑制EGFR自身磷酸化而阻滞传导，抑制肿瘤细胞的增殖，实现靶向治疗。临床主要用于治疗既往接受过化学治疗的局部晚期或转移性非小细胞肺癌，尤其对肺腺癌疗效确切，对鳞癌的疗效较腺癌和肺泡癌的低，但临床大量资料表明：根据肺癌患者的实际情况选用易瑞沙（吉非替尼）治疗后，仍有部分肺鳞癌和其它非小细胞肺癌的患者效果比较明显，且具有良好的耐受性。
Irea ( gefitinib ) is a novel small molecular weight drugs for the treatment of cancer, its mechanism is mainly through the inhibition of EGFR phosphorylation and block the conduction, inhibit the proliferation of tumor cells, for targeted therapy.Clinical mainly for the treatment of previously received chemotherapy for locally advanced or metastatic non-small cell lung cancer, especially the effect of the exact curative effect on lung adenocarcinoma, squamous cell carcinoma than in adenocarcinoma and bronchioloalveolar carcinoma is low, but a large number of clinical data show that : the Yi Rui sand according to the actual situation of patients with lung cancer ( than gefitinib ) after treatment, there are still some lung squamous cell carcinoma and other non small cell lung cancer patients with obvious effect, and has good tolerance.
