EGFRTKI耐药后治疗策略.ppt
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1、EGFR-TKI耐药后治疗策略,表皮生长因子信号通路,EGFR-TKI 获得性耐药机制,Major Mechanisms of Acquired Resistance Identified in Clinical Specimens Mechanism Estimated Frequency(%)EGFR TKI resistanceGenetic alterations in EGFRT790M mutations 50D761Y,T854A,and L747S mutations 5EGFR amplification 8Bypass signaling tractsMET amplifi
2、cation 5-22HER2 amplification 12PIK3CA mutations 5BRAF mutations 1 HGF overexpression 1 of 2 casesPhenotypic alterationsTransformation to small-cell lung cancer 3-14,ALK TKI 耐药机制,ALK TKI resistanceGenetic alterations in ALK 所占比例%ALK secondary mutations(eg,L1196M)22-36 ALK gene amplification 7-18 Byp
3、ass signaling tractsEGFR activation 44KIT gene amplification 15Abbreviations:EGFR,epidermal growth factor receptor;TKI,tyrosine kinase inhibitor;HER2,human epidermal growth factor receptor 2;HGF,hepatocyte growth factor;ALK,anaplastic lymphoma kinase.,酪氨酸激酶:单药用于晚期治疗无法根治,重复活检:观察越多,发现越多,Sequist et al.
4、Sci Transl Med 2011,Adapted;Sequist,ASCO 2012.,TKI获得性耐药的临床定义,EGFR TKI单药的治疗存在EGFR敏感突变或客观临床获益疾病进展(RECIST标准),Jackman DM et al;J Clin Oncol.2010;28(2):357-60.,Criteria for Acquired Resistance to EGFR Tyrosine Kinase Inhibitors1.Patient has received prior therapy with an EGFR TKI(monotherapy).2.Tumor gen
5、otyping confirms the presence of a typical EGFR mutationthat is associated with sensitivity to EGFR TKIs.Examples include exon19 deletions,L858R,and G719X.ORPatient achieves either a documented partial or complete response ORprolonged stable disease(6 months)based on RECIST or WHO criteria.3.Disease
6、 progression occurs despite uninterrupted exposure to an EGFRTKI within 30 days.4.Patient has not received additional systemic therapy sincediscontinuation of EGFR TKIs.Adapted from Jackman et al.26 Abbreviations:EGFR,epidermal growth factor receptor;TKI,tyrosine kinase inhibitor.,问题一:现有的治疗模式如何处理TKI
7、继发性耐药?(Continuous treatment beyond progression),61名EGFR M+获得性耐药患者准备参加MSKCC的临床试验,EGFR-TKI停药后的疾病“复燃”,EGFR TKI,PD,获得性耐药,721 天洗脱期,临床试验,mPFS19个月,Chaft,et al.Clin Cancer Res 2011,相关因素:TTP短(P=0.002),胸膜转移(P=0.03),CNS转移(P=0.01),与T790M无关,仍有依赖TKI控制的肿瘤,获得性耐药的局部治疗:MSKCC经验,184颅外PD患者(7+年)中,18例接受局部治疗排除CNS PD自局部治疗时间
8、中位TTP:10个月中位至新的全身治疗时间:22个月中位OS:41个月,Yu HA,et al.2012 ASCO Abstract 7527.,局部消融联合持续TKI治疗单个病灶进展患者,来自科罗拉多大学的65例致癌基因驱动癌症(EGFR突变或ALK阳性)所有患者接受EGFR TKI或克唑替尼PFS 1定义为进展4个部位所有侵犯部位均给予局部消融治疗和持续TKI治疗PFS 2定义为自局部治疗起至二次进展的时间,Weickhardt AJ,et al.JTO.2012 Dec;7(12):1807-14.,局部消融联合持续TKI治疗单个病灶进展患者,38例ALK+患者,28例(74%)进展中位
9、PFS1=9.0个月27例EGFR突变患者,23例(85%)进展中位PFS1=13.8个月所有患者中位PFS1=10.3个月51个进展患者中,25人适合局部治疗并继续原靶向治疗,Weickhardt AJ,et al.JTO.2012 Dec;7(12):1807-14.,接受局部消融治疗和持续TKI治疗患者的PFS,Weickhardt AJ,et al.JTO.2012 Dec;7(12):1807-14.,耐药后化疗+TKI和化疗的对比研究,EGFR突变状态:70例(90%)患者突变:TKI中位治疗时间15个月(范围4-51个月)8例患者突变状态未知:TKI中位治疗时间11个月(范围5-
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