KRAS抑制剂Adagrasib与Sotorasib治疗肺癌对比

2021-01-05 网络 网络

10月25日,Mirati Therapeutics在第32届国际分子靶标与癌症治疗学研讨会(EORTC-NCI-AACR)上发表两项关于其KRAS G12C选择性抑制剂Adagrasib(MRTX8

10月25日,Mirati Therapeutics在第32届国际分子靶标与癌症治疗学研讨会(EORTC-NCI-AACR)上发表两项关于其KRAS G12C选择性抑制剂Adagrasib(MRTX849)的最新临床数据,显示Adagrasib对携带KRAS G12C突变的晚期/转移性非小细胞肺癌,客观缓解率(ORR)达到45%,疾病控制率为96%;对携带KRAS G12C突变的结直肠癌ORR为17%,疾病控制率94%。
 
单纯从数据来看,Adagrasib确实优秀,毕竟Sotorasib(AMG510)在9月刚刚公布针对非小细胞肺癌和结直肠癌的最新数据,ORR分别为32.2%和7.1%,疾病控制率分别为88.1%和73.8%。不过Adagrasib是否具有优胜Sotorasib的潜力,还需分析一下这些数字背后的信息。后者详细见:NEJM:Sotorasib治疗KRAS突变晚期实体瘤效果显著但是,这种比较并不是头对头研究,因此,直接比较,仍然是不全面的,毕竟两个研究的人群之间存在差异。因此,下面仅供参考。
 
一、入组患者的基线情况
 
Adagrasib纳入的患者白人居多,中位年龄65岁,当前或此前吸烟以及接受过PD-1/L1治疗的患者达89%。在Sotorasib的临床研究中,共纳入59例NSCLC患者和42例结直肠癌患者,但患者处于不同的剂量队列研究中,并未全部接受推荐剂量(960mg)。中位年龄为60岁,当前或此前吸烟的比例与Adagrasib相当,NSCLC患者几乎全部接受过以铂类为基础的化疗和PD-1/L1治疗,这一比例要高于Adagrasib,在接受先前系统抗癌治疗的中位线级为3。
 
二、有效性数据
 
Adagrasib在NSCLC队列,评估了51位患者(14位来自Ⅰ/Ⅰb期;37位来自Ⅱ期,虽然来自不同研究,但给药剂量相同),45%的患者具有客观反应(23/51位患者,其中5例患者的部分反应未经证实且仍在接受治疗),70%(16/23)的应答者对肿瘤的最佳应答大于40%,患者的疾病控制率为96%(49/51)。在中位随访时间3.6个月内,65%(33/51)的患者仍在接受治疗,83%(19/23)的反应者尚未进展,仍在接受治疗。
 
但是,Adagrasib这一数据是针对具有临床活性且具有≥1可评估病灶的患者群体,而不是针对纳入研究的全部病例。如果按纳入研究的全部患者计算,Adagrasib在Ⅰ/Ⅰb中的ORR应为33.3%(6/18),疾病控制率为77.8%(14/18).在Ⅰ/Ⅰb和Ⅱ期研究中ORR应为29.1%(23/79),疾病控制率为62.0%(49/79)。这与Sotorasib数据相比,似乎并未显示优势。而Sotorasib在推荐剂量(960mg)队列中,35.3% (12 /34) 患者显示PR,疾病控制率为91.2% (31/34) 。
 
同样,在CRC中,Adagrasib 单药治疗携带KRAS G12C突变的结直肠癌:ORR 17%,疾病控制率94%。但是,若根据纳入研究的患者进行换算,ORR则为12.5%,疾病控制率70.8%。
 
三、安全性数据
 
在接受600mg BID的110名患者中,Adagrasib单药治疗的耐受性良好,任何级别的不良反应(TRAEs)发生率为85%,最常见(≥20%)不良反应为恶心(54%)、腹泻(51%)、呕吐(35%)、疲劳(32%)和ALT升高(20%),3级及以上不良反应发生比例为32%,分别发生1例复发性肺炎和心力衰竭的5级不良反应,4.5%的患者因治疗相关不良事件导致停药,不良反应导致停药的概率为7.5%。
 
相较而言,Sotorasib不良反应事件发生的比例更高了一些。125例患者报告了治疗期间发生的不良事件(96.9%),最常见的是腹泻(38例[29.5%])、疲劳(30例[23.3%])和恶心(27例[20.9%])。68例患者中报告了3级或更高级别的不良事件(52.7%)。共73名患者(56.6%)出现了与治疗相关的不良事件,2名患者(1.6%)出现严重不良事件,15位患者(11.6%)报告了3级或4级治疗相关的不良事件。与治疗相关的3级不良事件包括丙氨酸转氨酶(ALT)水平升高(4.7%)、腹泻(3.9%)、贫血(3.1%)、天冬氨酸转氨酶(AST)升高 (2.3%)、血碱性磷酸酶水平增加(1.6%)、肝炎(0.8%)、淋巴细胞计数减少(0.8%)、γ-谷氨酰转铁酶水平增加 (0.8%)和低钠血症(0.8%)。一名患者(0.8%)报告了与治疗相关的4级ALT升高,1名患者(0.8%)由于与治疗有关的3级ALT和AST水平升高而中断治疗 。
 
Adagrasib和Sotorasib均有5级不良事件的发生,但在因不良反应导致停药的概率上却相差不大(7.5% vs 7.0%)。
总之,有效性方面,NSCLC患者中,Adagrasib总的ORR为29.1%(23/79,以纳入研究的全部患者计,给药剂量相同),Sotorasib在推荐剂量(960mg)队列中,35.3%(12 /34) 患者显示PR,并且Sotorasib的疾病控制率要高于Adagrasib;在CRC患者群体中,Adagrasib的ORR高于Sotorasib,疾病控制率两者暂未显示出数值上的较大差异。当然,以上数据并不是两种药物的最终临床数据,临床样本量较少,更不是头对头的临床优劣对比,仅是在目前数据中窥探一下这两种KRAS G12C抑制剂的潜在临床有效性差异。
 
综上所述,从数据得出结论,一期和二期临床试验结果表明,在治疗效果中两者没有很大的差距,但是在不良反应中,抑制剂Adagrasib(MRTX849)的不良反应优于Sotorasib(AMG510)的不良反应。从三期结果能看出,抑制剂Adagrasib(MRTX849)治疗效果高于Sotorasib(AMG510)的疗效,MRTX849客观缓解率高于AMG510,疾病控制率也是超出很多。
 
原始出处:
Hong DS, Fakih MG, Strickler JH, Desai J, Durm GA, Shapiro GI, Falchook GS, Price TJ, Sacher A, Denlinger CS, Bang YJ, Dy GK, Krauss JC, Kuboki Y, Kuo JC, Coveler AL, Park K, Kim TW, Barlesi F, Munster PN, Ramalingam SS, Burns TF, Meric-Bernstam F, Henary H, Ngang J, Ngarmchamnanrith G, Kim J, Houk BE, Canon J, Lipford JR, Friberg G, Lito P, Govindan R, Li BT. KRAS(G12C) Inhibition with Sotorasib in Advanced Solid Tumors.N Engl J Med. 2020 Sep 24;383(13):1207-1217
 
Hallin J, Engstrom LD, Hargis L, Calinisan A, Aranda R, Briere DM, Sudhakar N, Bowcut V, Baer BR, Ballard JA, Burkard MR, Fell JB, Fischer JP, Vigers GP, Xue Y, Gatto S, Fernandez-Banet J, Pavlicek A, Velastagui K, Chao RC, Barton J, Pierobon M, Baldelli E, Patricoin EF 3rd, Cassidy DP, Marx MA, Rybkin II, Johnson ML, Ou SI, Lito P, Papadopoulos KP, Jänne PA, Olson P, Christensen JG. The KRASG12C Inhibitor MRTX849 Provides Insight toward Therapeutic Susceptibility of KRAS-Mutant Cancers in Mouse Models and Patients.Cancer Discov. 2020 Jan;10(1):54-71. doi: 10.1158/2159-8290.CD-19-1167

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    2021-09-10 jklm09
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    2021-01-12 ms5000000518166734

    已读

    0

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    2021-01-07 般若傻瓜
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    2021-01-07 yinhl1978
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