我刚看论坛得知憨豆叔走了,虽然憨豆叔用靶向药轮换顺利地“延长了耐药”时间,但是从这篇论文的实验数据上来说,并不支持憨豆叔的换靶理论。
现在截取中间一段:
We compared low-dose (15 mg/kg) gefitinib therapy
with high-dose (50 mg/kg) therapy using an EGFR-mutated lung cancer xenograft model. Both gefitinib doses
induced tumor shrinkage, but tumors regrew in the low-dose group within 1 month, whereas tumors in the high-dose
group did not. Neitherthe T790M mutation nor MET amplification was apparent in regrown tumors. We also
compared outcomes after administration of two doses of gefitinib (5 and 25 mg/kg) in a transgenic EGFR-mutated
lung cancer mouse model. In line with the results obtained using the xenograft model, both gefitinib doses completely
inhibited tumor growth, but tumors treated with the lower dose of gefitinib developed earlier drug resistance.
翻译一下:
我们使用低剂量 (15 mg/kg)的易瑞沙疗法和高剂量(50 mg/kg)疗法用于EGFR突变的肺癌异种种植模型上。两种治疗方案都可以导致肿瘤缩小,但是在低剂量观察组中发现肿瘤在1个月内又重新生长,而在高剂量组下肿瘤并没有生长。并且发现在重长的肿瘤里面没有发现T790M突变或者MET扩增。(这句话是关键)。我们也比较了两组易瑞沙(5 和 25mg/kg在EGFR突变基因移植的肺癌老鼠模型。结果与先前在异种种植模型上的结论一致,易瑞沙完全抑制了肿瘤的生长,但是低剂量下肿瘤显示较早的抗性。