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| 1 | NSCLC携带EGFR少见突变分析及EGFR-TKIs疗效初步观察显示文摘背景与目的表皮生长因子受体(epidermal growth factor receptor,EGFR)敏感性突变是EGFR酪氨酸激酶抑制剂(tyrosine kinase inhibitors,TKIs)的有效预测因子。85%-90%敏感性突变发生于19缺失突变及21外显子L858R突变。常见EGFR敏感性突变患者EGFR-TKIs治疗的客观缓解率(objective response rate,ORR)和无病进展生存时间(progression-free survival,PFS)显著延长,可分别达70%-80%和9个月-14个月。但EGFR-TKIs对于EGFR少见突变(uncommon mutations)的疗效尚不明确。本研究旨在探讨EGFR少见突变的临床病理特征及EGFR-TKIs治疗的远近期疗效。方法收集2010年4月-2015年4月北京大学肿瘤医院胸部肿瘤内科24例少见EGFR突变患者的临床资料,分析少见EGFR突变的临床病理特征及与TKIs疗效及PFS之间的关系。结果 24例携带少见突变的患者中,单突变者15例,双突变者9例。15例单突变中,S768I、L861Q、20外显子插入突变、G719X分别为4例、4例、3例、2例。双突变中以S768I合并G719X最为常见(3/9)。在接受EGFR-TKIs治疗的13例患者中,ORR为46.1%(6/13),疾病控制率(disease control rate,DCR)为76.9%(10/13),中位PFS为7.4个月。结论作为特殊类型的EGFR突变,EGFR少见突变对于一代EGFR-TKIs的敏感性介于EGFR敏感性突变和EGFR野生型之间。相对于一代EGFR-TKIs而言,二代EGFRTKIs可能更适用于EGFR少见突变的治疗。。 | 杨雪 陈含笑 张弘 段建春 安彤同 赵军 卓明磊 吴梅娜 王洁 | 2015 | 中国肺癌杂志2015，18，8： | 7 |
| 2 | JAK3 inhibitor Ⅵ is a mutant specific inhibitor for epidermal growth factor receptor with the gatekeeper mutation T790M显示文摘AIM:To identify non-quinazoline kinase inhibitors effective against drug resistant mutants of epidermal growth factor receptor(EGFR).METHODS:A kinase inhibitor library was subjected to screening for specific inhibition pertaining to the in vitro kinase activation of EGFR with the gatekeeper mutation T790 M,which is resistant to small molecular weight tyrosine kinase inhibitors(TKIs) for EGFR in nonsmall cell lung cancers(NSCLCs). This inhibitory effect was confirmed by measuring autophosphorylation of EGFR T790M/L858 R in NCI-H1975 cells,an NSCLC cell line harboring the gatekeeper mutation. The effects of a candidate compound,Janus kinase 3(JAK3) inhibitor Ⅵ,on cell proliferation were evaluated using the MTT assay and were compared between T790M-positive and-negative lung cancer cell lines. JAK3 inhibitor Ⅵ was modeled into the ATP-binding pocket of EGFR T790M/L858 R. Potential physical interactions between the compound and kinase domains of wild-type(WT) or mutant EGFRs or JAK3 were estimated by calculating binding energy. The gatekeeper residues of EGFRs and JAKs were aligned to discuss the similarities among EGFR T790 M and JAKs. RESULTS:We found that JAK3 inhibitor Ⅵ,a known inhibitor for JAK3 tyrosine kinase,selectively inhibits EGFR T790M/L858 R,but has weaker inhibitory effects on the WT EGFR in vitro. JAK3 inhibitor Ⅵ also specifically reduced autophosphorylation of EGFR T790M/L858 R in NCI-H1975 cells upon EGF stimulation,but did not show the inhibitory effect on WT EGFR in A431 cells. Furthermore,JAK3 inhibitor Ⅵ suppressed the proliferationof NCI-H1975 cells,but showed limited inhibitory effects on the WT EGFR-expressing cell lines A431 and A549.A docking simulation between JAK3 inhibitor Ⅵ and the ATP-binding pocket of EGFR T790M/L858 R predicted a potential binding status with hydrogen bonds. Estimated binding energy of JAK3 inhibitor Ⅵ to EGFR T790M/L858 R was more stable than its binding energy to the WT EGFR. Amino acid sequence alignments revealed that the gatekeeper residues of JAK family kinases are methionine in WT,similar to EGFR T790 M,suggesting that TKIs for JAKs may also be effective for EGFR T790 M. CONCLUSION:Our findings demonstrate that JAK3 inhibitor Ⅵ is a gatekeeper mutant selective TKI and offer a strategy to search for new EGFR T790 M inhibitors. | Naoyuki Nishiya Yasumitsu Sakamoto Yusuke Oku Takamasa Nonaka Yoshimasa Uehara | 2015 | World Journal of Biological Chemistry2015，6，4： | 1 |
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