NEJM丨肺癌,KRAS新药adagrasib再显锋芒,ORR高达42.9%

2022-08-06 e药安全 网络

在所有KRAS突变中,KRAS p.G12C单核苷酸变异(密码子12处的甘氨酸被半胱氨酸取代)是NSCLC中最常见的变异,肺腺癌的这一突变携带率约为13% 。

患者招募丨MRTX849治疗KRAS G12C突变

RAS是人类肿瘤中最先被鉴定出来的致癌基因,也是存在最为广泛的致癌性突变基因之一,发现至今已超过30年。RAS基因家族目前已知的成员包括KRAS,NRAS和HRAS,其中KRAS突变最为常见,大约占85%。在所有KRAS突变中,KRAS p.G12C单核苷酸变异(密码子12处的甘氨酸被半胱氨酸取代)是NSCLC中最常见的变异,肺腺癌的这一突变携带率约为13% 。

不过长期以来,KRAS突变抑制剂却一直没有研发成功。首先,因为KRAS蛋白表面太过平滑,没有适合小分子结合的口袋;再加上细胞内GTP/GDP浓度较高并以高亲和力结合KRAS,所以无法像TKI那样设计与GTP/GDP竞争的小分子;而设计针对下游信号分子的抑制剂也不能完全阻断KRAS突变的信号。因此,科研人员在开发KRAS突变抑制剂的道路上频频碰壁。

可喜的是,近些年报道的KRAS G12C不可逆抑制剂(如AMG510、MRTX849)临床研究初步结果让整个医学界看到了抑制KRAS突变的曙光。

6月6日,顶级医学期刊NEJM杂志上公布了Adagrasib的完整II期试验结果。

 

研究方法
入排标准
KRYSTAL-1试验[1]:在1~2期研究KRYSTAL-1的1~1b期部分,Adagrasib表现出临床活性,并且不良事件特征可接受。2022年ASCO会议公布了KRYSTAL-1试验队列A结果(II期),评估了Adagrasib用于局部晚期或转移性KRAS p.G12C突变NSCLC患者的疗效和安全性。KRAS新药MRTX849初露峥嵘,疾病控制率高达96%(点击)
纳入标准:1. 年龄≥18岁;2. KRAS p.G12C突变的局部晚期或转移性NSCLC;3. 既往至少接受过一种含铂化疗和/或免疫治疗;4. ECOG评分0-1分;5. 有可测量病变(RECIST1.1版)。
排除标准:1. 活动性CNS转移(如果CNS转移经过充分治疗且稳定的,则符合纳入标准);2. 在Adagrasib治疗开始前2周内接受过全身治疗或放射治疗;3. 既往接受过KRAS G12C抑制剂治疗。
试验设计和终点
患者口服Adagrasib、600mg、每日两次。Adagrasib用药持续至发生疾病进展、出现无法接受的副作用、或者患者撤回知情同意。主要终点是客观缓解(BICR评估);次要终点包括疾病控制、缓解持续时间、无进展生存期、总生存期及安全性。
探索性生物标志物分析,对肿瘤组织样本、血液样本或两者进行分子水平分析候选生物标志物(PD-L1及STK11、KEAP1、TP53和CDKN2A突变状态),已确定它们与肿瘤应答情况之间的关系。
研究结果
实验人群

截至2021年10月15日,共计116例KRAS G12C突变的NSCLC患者接受了治疗(中位随访期,12.9个月);中位年龄64岁,美国东部肿瘤协作组(ECOG)体力状态评分(PS)0分和1分分别占比15.5%和83.6%;中位经治线数为二线,接受三线及以上患者达22%;全部患者接受过含铂化疗,98.3%(114例)的患者之前接受过免疫治疗和含铂化疗;基线存在脑转移的患者达20.7%。根据研究者的评估,4 名患者在基线时有可测量的疾病,但根据盲态独立评审委员会的评估则没有。

临床疗效

在112例基线时有可测量病变的患者中,48例(42.9%)达到经确认的客观缓解疾病控制率(DCR)达79.5%,6例5.4%疾病进展17例(15.2%)总体疗效无法进行临床估:14例在计划的首次评估之前已退出研究(5例主动要求,3例健康状况恶化,3例因不良事件而,2例死亡,1例因其他原因);其余3例患者基线后扫描时间过早,无法进行评估。

在达到患者的48例中,中位反应时间1.4个月,中位缓解持续时间为8.5个月(95%置信区间[CI],6.2-13.8),中位无进展生存期为6.5个月(95% CI,4.7-8.4)。更新数据截至2022年1月15日(中位随访期,15.6个月),中位总生存期为12.6个月(95% CI,9.2-19.2),估计 1 年总生存率为 50.8%(95% CI,40.9-60.0)。

基线特征
DOR、PFS、OS
整体疗效

颅内缓解

脑转移:使用改良的神经肿瘤学脑转移反应评估 (RANO-BM) 标准对颅内反应进行事后评估,确定了42例基线时有CNS转移的患者,中位随访时间为15.4个月。在可以进行放射影像学评估的33例患者中有27例在Adagrasib治疗前接受了放射治疗,59%在研究开始前3个月内、37%在研究开始前至少6个月接受放疗,独立委员会评估的颅内客观缓解率为 33.3%,颅内缓解的中位持续时间为11.2个月。在整个队列中(42例),中位颅内病灶无进展生存期可达5.4个月。这次公布的研究结果中关于颅内病灶的分析不属于前瞻性研究,且此队列排除了未经治疗具有活动性中枢转移灶的患者,因此其对于中枢病灶的治疗效果仍有待进一步证实

探索性分析

在伴随STK11、KEAP1、TP53和CDKN2A改变的患者中,确认的客观缓解率分别为40.5%、28.6%、51.4%和58.3%。对发生STK11、KEAP1或两者改变的患者所做的进一步分析表明,在根据基因组确定的各人群中均观察到缓解(35.7%~55.9%),但在发生KEAP1突变的STK11野生型人群中较低(14.3%)。在评估PD-L1表达情况的86例患者中,各PD-L1表达亚组的确认客观缓解率相似(41.7%~46.8%)。

 

安全性
最常见的事件是腹泻(82[70.7%])、恶心(81[69.8%])、疲劳(69[59.5%])、呕吐(66[56.9%])、贫血(42[36.2%])、呼吸困难 (41[35.3%])、血肌酐水平升高 (40[34.5%]) 和食欲下降 (37[31.9%])。共有52例患者(44.8%)出现 3 级或更高级别的治疗相关不良事件;最常见的是疲劳、恶心、ALT 水平升高(各占 4.3%)和 AST 水平升高(3.4%)。治疗相关的不良事件导致60例患者(51.7%)的剂量减少和71例患者(61.2%)的剂量中断;8例患者(6.9%)因治疗相关不良事件而停用。
不良反应1
不良反应2
小  结

1. 与sotorasib相似,adagrasib是KRASG12C的选择性共价抑制剂;目前已报道的上述两种分子的药理学差异包括:sotorasib的药物半衰期为5小时,而adagrasib为23小时;adagrasib能够以剂量依赖性方式延长暴露时间;以及adagrasib可能可以穿透CNS。

2. 本研究显示,adagrasib治疗KRAS G12C的ORR为42.9%,PFS为6.5个月、OS为12.6个月。并且对大多数亚组(包括CNS转移患者)和大多数分子相关特征显示出临床疗效证据。不过对于CNS转移患者的疗效属于回顾性分析,目前针对未经治疗的活动性CNS转移患者的前瞻性Ib期队列研究正在进行中。

3. 目前,一项比较adagrasib与多西他赛的3期试验正在进行中(KRYSTAL12,NCT04685135);另外,一项评估adagrasib±帕博利珠单抗治疗晚期KRASG12C突变NSCLC患者的一线治疗也在进行中(KRYSTAL7,NCT04613596)。

参考资料

Jänne PA, Riely GJ, Gadgeel SM, et al. Adagrasib in Non-Small-Cell Lung Cancer Harboring a KRASG12C Mutation. N Engl J Med. 2022 Jun 3. doi: 10.1056/NEJMoa2204619.

 

 
 
 

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    2022-08-08 仁心济世
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    2022-08-08 yinhl1978
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    2022-08-08 psybestwish
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    2022-08-07 1391f0107em

    学习了

    0

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    2022-08-06 小元

    NEJM上果然牛,感谢梅斯更新及时

    0