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1、胃癌靶向治疗,分子靶向治疗困惑的临床,理解分子靶点 理解疗效与特异性毒性反应 药物机理与临床研究结果的解读 分子靶向治疗药物的应用实践 做到真正的translational research指导临床研究设计指导临床指南,胃癌靶向治疗,近十年的晚期胃癌临床研究,MAGIC in NEJM(Cunningham,2006)TAX 325 in JCO（Eric Van Cutsem,2006）REAL-2 in NEJM(Cunningham,2008)ML-17032 in Ann Oncology（Kang,2009）FLAGS in ASCO GI（Ajani,2009）ToGA in AS
2、CO(Eric Van Cutsem&Bang,2009)AVAGAST in ASCO(Kang,2010)GRANIT-1(Eric Van Cutsem,2012）REAL-3(Waddell,2012),胃癌靶向治疗,目前正在研究中的胃癌治疗靶点与靶向药物,Wong H,Yau T.The Oncologist 2012;17:346-358.,胃癌靶向治疗,合理治疗靶点的标准,与肿瘤的恶性表型相关重要脏器与组织中很少表达分子特性与生物学行为相关能在临床较易获得的样本中重复检测与临床预后相关当该靶点被阻断、干扰或抑制时，对高度表达该靶点的患者应有一定的临床反应，对不表达该靶点者，应无或
3、产生较少临床反应,胃癌靶向治疗,胃癌的分子靶点寻找,KRAS MT40%)HER-2 过表达10-25%,胃癌靶向治疗,单药应用疗效有限（Phase 2）,胃癌靶向治疗,靶向化疗：成绩较好（Phase 2）,1.Shah et al.J Clin Oncol,2006;24;6201;2.DL Fabio et al.ESMO,2006,Abstract 1077PD;3.Pinto et al.Ann Oncol 2007;4.Lordick et al.Ann Oncol 2008,胃癌靶向治疗,铂类药物替换,氟尿嘧啶类药物替换,分子靶向药物,添加药物,替换药物,基于优效性检验的胃癌一线化
4、疗方案,晚期胃癌药物治疗的优化策略,序贯治疗,诱导化疗/维持化疗,其他策略,目标：延长生存,胃癌靶向治疗,ToGA（XP/FPH）,AVAGAST（XPBV）,07/23/2007,胃癌靶向治疗,胃癌 EGFR 表达,包括EGF家族在内的各类生长因子及其受体在胃癌中呈过度表达(Gastric Cancer 2004;7:61-77)免疫组化染色提示胃癌组织中EGFR表达率为59,5 86%(JCO2006;24:4922-4927;ASCO2007#4526)RT-PCR检测提示胃癌组织中EGFR基因扩增率约 62%(World J Gastroenterol 2007;13:3605-360
5、9)EGFR表达升高与以下临床病理因素相关:进展期胃癌淋巴结转移 生存期缩短(EJC 2001;37:S9-S15),胃癌靶向治疗,EGF receptor signaling pathway:A rationale for personalized therapy,Yarden Y,Sliwkowski MX.Nat Rev Mol Cell Biol 2001;2:127137;Chakravarti A,et al.Cancer Res 2002;62:43074315;Baselga J.Eur J Cancer 2001;37(Suppl.4):S16S22;Kawanaka H,e
6、t al.Life Sci 2001;69:30193033,胃癌靶向治疗,EGFR TKI in GC(Phase 2),Doi 2036,Proc ASCO 22,2003;Ferry Clin Can Res,132:5669,2007,Jarmaat,JCO,24,2008,07/23/2007,胃癌靶向治疗,西妥昔单抗一线治疗胃癌的尝试,胃癌靶向治疗,年龄18岁，KPS评分60分病理学和/或细胞学证实为胃腺癌，预计生存期3月局部晚期或转移性癌，无法手术切除一线治疗患者，接受辅助治疗至少间隔6月以上血常规检查正常：WBC3.0109/L，中性粒细胞 1.5109/L，PLT80109/
7、LECOG 评分为 2无严重心、肺、肝、肾功能障碍，未伴发急性感染,西妥昔单抗+FOLFOX4一线治疗晚期胃癌临床观察,Shi M,Zhang J,et al,Hepatogastroenterology,2011,胃癌靶向治疗,临床疗效评价,例数 百分比（%）,CR 0 0,PD 4 16.0,SD 12 48.0,PR 9 36.0,ORR=9/25=36.0%DCR=20/24=84.0%,Shi M,Zhang J,et al,Hepatogastroenterology,2011,胃癌靶向治疗,治疗前后CT,病例1：胃癌肝转移,Shi M,Zhang J,et al,Hepatoga
8、stroenterology,2011,胃癌靶向治疗,治疗前后CT,病例2：胃癌肝多发转移,Shi M,Zhang J,et al,Hepatogastroenterology,2011,胃癌靶向治疗,治疗前后CT,病例3：胃癌肝多发转移,Shi M,Zhang J,et al,Hepatogastroenterology,2011,胃癌靶向治疗,PFS&OS,mPFS=6.5个月,mOS=10.6个月,Shi M,Zhang J,et al,Hepatogastroenterology,2011,胃癌靶向治疗,胃癌 KRAS 突变率,KRAS recently identified as p
9、redictive marker for response to EGFR-inhibitor therapy in mCRC.Incidence of KRAS mutations in gastric cancer?,Current assumption:KRAS尚不能作为胃癌EGFR靶向抑制治疗的疗效预测标志物,胃癌靶向治疗,Cisplatin 80mg/m2 d1Capecitabine 1000mg/m2 twice daily;d1-14q3w,RANDOM,Until radiographically documented PD or unacceptable toxicity
10、Primary endpoint:PFS time(as assessed by Independent Review Committee),Cisplatin 80mg/m2 d1Capecitabine 1000mg/m2 twice daily;d1-14q3wCetuximab 400mg/m2 loading dose,then 250mg/m2 per week,EXPAND Phase III,胃癌靶向治疗,EGFR单克隆抗体的分类,-momab,-ximab,-mumab,-zumab,鼠源,嵌合,全人源化,人源化,胃癌靶向治疗,如何改进？,进行亲和力设计，实现最适亲和力,胃癌
11、靶向治疗,TITLE,胃癌靶向治疗,TITLE,胃癌靶向治疗,TITLE,胃癌靶向治疗,TITLE,胃癌靶向治疗,皮疹与疗效相关？,胃癌靶向治疗,ToGA研究中HER-2检测情况,HER2 with IHC&FISHResults2484 个进展期胃癌蜡块544 HER2+(21,9%)IHC-FISH一致率 87,3与胃癌临床病理因素的关系,胃癌靶向治疗,HER-2 在胃癌表达,Ann Oncol,2008,19:1523外科杂志1996,1:25,宫立群133中国18,1IHC,胃癌靶向治疗,ToGA 研究设计,HER2-阳性晚期胃癌患者(n=584),5-FU 或 卡培他滨a+顺铂(n=
12、290),R,a由研究者的判别来选择GEJ,胃食管连接部,5-FU 或 卡培他滨a+顺铂+赫赛汀(n=294),分层因素局部晚期或转移性 胃体部 vs 胃食管连接部可测量 vs 不可测量ECOG 评分 0-1 vs 2卡培他滨 vs 5-FU,全球、多中心、随机、开放III期临床研究,1Bang et al;Abstract 4556,ASCO 2009,3807 位患者接受筛选1 810 HER2-阳性(22.1%),胃癌靶向治疗,患者的人口统计学以及基线特征,入组最多的为韩国，日本，中国和俄罗斯F,氟尿嘧啶;C,顺铂 an=287;bn=293,胃癌靶向治疗,Primary end poi
13、nt:OS,Time(months),294290,277266,246223,209185,173143,147117,11390,9064,7147,5632,4324,3016,2114,137,126,65,40,10,00,No.at risk,11.1,13.8,0.0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1.0,0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,Event,FC+T,FC,Events167182,HR0.74,95%CI0.60,0.91,p value0.0046,Med
14、ianOS13.811.1,T,trastuzumab,胃癌靶向治疗,Secondary end point:PFS,0,2,4,6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,Event,294290,258238,201182,14199,9562,6033,4117,287,215,133,93,82,62,61,61,40,20,00,5.5,6.7,No.at risk,0.0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8,0.9,1.0,Time(months),FC+T,FC,Events226235,HR0.71,95%C
15、I0.59,0.85,p value0.0002,MedianPFS6.75.5,胃癌靶向治疗,Secondary end point:tumor response rate,2.4%,5.4%,32.1%,41.8%,34.5%,47.3%,Intent to treat,ORR=CR+PRCR,complete response;PR,partial response,p=0.0599,p=0.0145,F+C+trastuzumab,F+C,p=0.0017,Patients(%),CR,PR,ORR,胃癌靶向治疗,Cross-trial Comparation of 1st Tx of
16、 GC,张俊,中国医学论坛报,20090723,胃癌靶向治疗,The response rate of Herceptin+CT in HER-2 positive patients was 47.3%,which means the other half of the patients were no response to Herceptin treatmentThe underlying mechanism is still unclear,Comments(Response rate),胃癌靶向治疗,TITLE,胃癌靶向治疗,标本储藏条件对IHC 和 FISH结果的影响胃癌的异质性胃癌
17、细胞HER-2染色特征与乳腺癌的差异,Comments(Standard techniques for HER-2 detection),胃癌靶向治疗,Comments(Predictive marker),HER-2 与胃癌预后不良相关，HER-2作为Herceptin治疗胃癌的疗效预测标志物的价值？HER-2/neu 信号通路内的其他接头蛋白或转录因子作为潜在疗效预测标志物的价值？EGFR 单抗治疗中KRAS 的故事,胃癌靶向治疗,113,OS in IHC2+/FISH+or IHC3+(exploratory analysis),1.0,0.8,0.6,0.4,0.2,0.0,36,3
18、4,32,30,28,26,24,22,20,18,16,14,12,10,8,6,4,2,0,Time(months),11.8,16.0,FC+T,FC,Events120136,HR0.65,95%CI0.51,0.83,MedianOS16.011.8,Event,0.1,0.3,0.5,0.7,0.9,218 198,40,53,124,2011,228 218,196 170,170 141,142 112,12296,10075,8453,6539,5128,10,00,No.at risk,3920,2813,胃癌靶向治疗,研究设计:开放、单组、II期研究主要终点:ORR次要终
19、点:PFS,中国晚期胃癌患者HER2阳性率,OS,安全性,HER2+晚期胃癌之前未接受治疗,曲妥珠单抗8mg/kg 首剂,然后 6mg/kg 每3周卡培他滨1000 mg/m2 BID D1-14 每3周奥沙利铂130 mg/m2,D1 每3周,曲妥珠单抗6mg/kg 每3周卡培他滨1000 mg/m2 BID D1-14 每3周直到进展,6 cycles,第一阶段,CGOG1001（ML25578）:曲妥珠单抗联合XELOX方案用于HER2阳性晚期胃癌的一线治疗,HER2+晚期胃癌之前未接受治疗,曲妥珠单抗8mg/kg 首剂,然后 6mg/kg 每3周卡培他滨1000 mg/m2 BID D
20、1-14 每3周奥沙利铂130 mg/m2,D1 每3周,曲妥珠单抗6mg/kg 每3周卡培他滨1000 mg/m2 BID D1-14 每3周直到进展,6 cycles,第二阶段,如果16例患者中有7例以上患者缓解，研究进入第二阶段,全部 N=51,胃癌靶向治疗,43,mTOR,mTOR是细胞代谢、生长、增殖和血管生成的核心调控者1,2mTOR是肿瘤生长开关1,2胰岛素样生长因子-1（IGF-1）等激活mTOR通路 mTOR激活以下基因突变:PTEN,TSC2,NF1和VHL丢失抑制mTOR能抑制肿瘤的生长和增殖2,1.Yao JC,et al.Best Prac Clin Endocrin
21、ol Metab.2007;21:163-172.2.von Wichert G,et al.Cancer Res.2000;60:4573-4581.,mTOR:哺乳动物雷帕霉素靶蛋白,胃癌靶向治疗,GRANITE-1研究,N=656,靶向组(439):BSC+Everolimus,对照组(217):BSC+安慰剂,R,2012 ASCO GI,胃癌靶向治疗,Everolimus用于胃癌的思考,单药用于二线/三线并未显著延长OSmOS HR 0.90（N.S.）mPFS 1.44 1.68 mos，HR 0.66，P 0.001疾病控制率 22%43%III期研究未能重复II期数据(n=53
22、)OS 10.1 mos，PFS 2.7 mos，DCR 56%,胃癌靶向治疗,胃癌靶向治疗,AVAGAST:A Randomized Double-Blind Placebo-Controlled Phase III Study,Starting dose of bev/placebo:30 minutes,subsequent doses:15 minutes,Capecitabine*/Cisplatin(XP)+Placebo q3w,Capecitabine*/Cisplatin(XP)+Bevacizumab q3w,Locally advanced or metastatic g
23、astric cancer,R,*5-FU also allowed if cape contraindicatedCape 1000 mg/m2 oral bid,d114,1-week restCisplatin 80 mg/m2 d1Bevacizumab 7.5 mg/kg d1Maximum of 6 cycles of cisplatinCape and bevacizumab/placebo until PD,Stratification factors:1.Geographic region2.Fluoropirimidine backbone3.Disease status,
24、胃癌靶向治疗,病例特征(I),*1 additional patient had an ECOG PS of 4,胃癌靶向治疗,病例特征(II),胃癌靶向治疗,总生存,387387,343355,271291,204232,146178,98104,1519,XP+PlaceboXP+Bev,Number at risk,5450,00,胃癌靶向治疗,无进展生存,387387,279306,145201,86123,5571,3238,33,1511,00,XP+PlaceboXP+Bev,Number at risk,胃癌靶向治疗,最佳总体反应率,胃癌靶向治疗,总生存:亚组分析,Pan-Am
25、erica,*29 patients with locally advanced disease only,胃癌靶向治疗,不同地理区域的患者特征,*1 additional patient had an ECOG PS of 4,胃癌靶向治疗,不同地理区域患者接受二线治疗情况,胃癌靶向治疗,AVAGAST 分析,东西方的胃癌因发病机制、遗传背景、高发部位、人种差异 ToGA研究的干扰分子标志物的探索,胃癌靶向治疗,Resectable adenocarcinoma of the stomach or Type III OGJPlanned n=1100,Randomised,Pre-opera
26、tive ECX x3,Surgical resection 5-6/52 after last capecitabine,Post-operative ECX x3 within 6-10/52,Pre-operative ECX+bevacizumab x3,Surgical resection 8/52 after last bevacizumab,Post-operative ECX+bevacizumab x3 within 6-10/52,MAGIC-B(STO-3)III期临床:围手术期 ECX Avastin 用于可切除的GC,A.F.Okines,et al.ASCO 201
27、0(abstract no.4019),Primary endpoint:OS,胃癌靶向治疗,MAGIC-B研究初步安全性结果(n=200),Okines AFC,et al.ASCO 2011 Abstract 4092.,卡培他滨未被SFDA批准用于胃癌辅助治疗,胃癌靶向治疗,多靶点阻断的问题,多个通路的多点阻断（横向联合）同一通路的多点阻断（纵向联合）细胞内外/上下游的阻断分子标志物指导下的治疗,胃癌靶向治疗,正在进行的晚期/转移性胃癌靶向药物III期研究,，(accessed May 9th 2012),胃癌靶向治疗,结论,对HER-2阳性的食管-胃肿瘤，在铂类/氟尿嘧啶化疗的基础上，联合使用曲妥珠单抗，是一个新治疗方案在铂类/氟尿嘧啶化疗的基础上，联合贝伐珠单抗可明显降低晚期胃癌疾病进展风险西妥昔单抗联合化疗用于胃癌一线治疗显示较好前景热点：分子标志物指导下的个体化治疗与不同分子靶向治疗药物搭配的化疗伴侣序贯治疗与维持治疗,胃癌靶向治疗,谢 谢,
