BMC Cancer:EGFR 19外显子缺失插入突变患者一代EGFR-TKI治疗应答较好,获得T790M突变后奥希替尼治疗同样应答较好

2021-12-19 yd2015 MedSci原创

研究表明,罕见EGFR 1919delins突变患者使用第一代EGFR-TKI治疗疗效与常见EGFR 19del突变患者相当,且耐药机制基本类似,获得T790M突变对奥希替尼应答类似。

在现有的下一代测序(NGS)中,表皮生长因子受体(EGFR) 19外显子缺失-插入(19delins)仍然被归类为EGFR 19外显子缺失(19del)然而,在非小细胞肺癌(non-small cell lung cancer, NSCLC)患者中,这两种突变类型对第一代EGFR酪氨酸激酶抑制剂(TKI)的应答和耐药机制是否相似仍存在争议。来自郑州大学附属第一医院的团队开展了回顾性研究,评估这两种突变类型患者对第一代EGFR-TKI的应答以及耐药机制后后线治疗疗效情况。相关结果发表在BMC Cancer杂志上。

研究先后回顾性分析了201711月-202093054例晚期NSCLC患者的NGS数据。最后,41EGFR 19delins突变患者和41EGFR 19del突变患者接受第一代EGFR-TKIs作为一线治疗纳入研究。

3054例诊断为晚期NSCLC的患者中,41例EGFR 19delins突变患者纳入本研究,其中41例EGFR 19del突变患者作为对照队列。EGFR 19delins患者多为女性(24/41)、非吸烟者(34/41)IV期疾病(41/41)和腺癌组织(40/41)基线时,8基因组(26.8%11/41)14基因组(36.6%15/41)56基因组(36.6%15/41)用于EGFR 19delins队列的NGS分析。在41EGFR 19del患者中,分别采用8基因组(24.4%10/41)14基因组(41.5%17/41)56基因组(31.1%14/ 41)进行NGS分析。

EGFR 19delins队列中发现了17种不同的突变类型。其中,L747_ K754delinsSR、A750_I759delinsPS和L747- T751delinsAI是新发现且未在文献和体细胞突变数据库(Catalogue of Som- atic mutation in Cancer, COSMIC)中发表的3个位点。EGFR 19delins队列中最常见的突变类型为L747_P753delinsS (n=10, 24.4%)、l747_a750delP (n= 9, 22.0%)、L747_ t751delP(n=6, 14.6%)和E746_S752delinsV (n= 3, 7.3%)。

          EGFR 19delins突变不同亚型

EGFR 19delin患者分别给予吉非替尼(n=24, 58.5%)、埃克替尼(n=15, 36.6%)和厄洛替尼(n=2, 4.9%)。同样,EGFR 19del患者分别给予吉非替尼 (n=25, 61.0%)、埃克替尼(n=14, 34.1%)和厄洛替尼(n=2, 4.9%)

两组患者的客观缓解率(ORR)和疾病控制率(DCR)相似(EGFR 19delins vs. EGFR 19del: ORR 75.6% vs. 78.0%;DCR 97.6% vs. 100%)。在EGFR 19delins患者中,一线EGFR-TKI治疗后,31例患者获得部分缓解(PR,75.6%);9例病情稳定(SD,22.0%); 1例患者病情进展(PD, 2.4%)。同样,在携带EGFR 19del的患者中,PR、SD和PD的发生率分别为78.0%(32/41)、22.0%(9/41)和0。

      EGFR 19delins和EGFR 19del一线TKI治疗疗效评估

EGFR 19delins患者和EGFR 19del患者的中位PFS (mPFS)类似,分别为10.4个月和13.1个月(HR: 0.6527; 95%CI:0.3885-1.0983;p = 0.108)。有趣的是,不同EGFR 19delins突变类型患者的预后并不完全相同。L747_T751delinsP患者的中位PFS较L747_P753delinsS, L747_A750delinsP, 和其他突变亚型患者(18.7months vs 13.1 months, HR: 0.3318; 95% CI: 0.1193-0.9232; p =0.035)明显延长。L747_A750delP和L747_T751 delP患者之间中位PFS无显著差异。尽管病例有限,我们也试图分析三个第一代EGFR TKIs对EGFR 19delins患者的影响。吉非替尼、埃克替尼和厄洛替尼组间差异无统计学意义,分别为14.7个月、10.9个月和13.1个月(p>0.05)。

         两组以及亚组预后分析

使用第一代EGFR-TKI后,携带EGFR 19delins34例患者和携带EGFR 19del32例患者出现PD。进展时,EGFR 19delins64.7%(22/34)EGFR 19del78.1%(25/32)进行了再活检和NGS检测。EGFR T790M是两组患者的主要耐药机制,差异无统计学意义,p = 0.706 (EGFR 19delins vs. EGFR 19del: 54.5% (12/22) vs. 60.0%(15/25)。EGFR 19delins和EGFR 19del患者中分别有22.7%(5/22)和24.0%(6/25)未发现耐药突变。此外,EGFR 19delins队列中,1例发生肉瘤样癌转化,2例发生腺癌鳞状转化。相比之下,在EGFR 19del队列中,各有1例发生小细胞肺癌转化和腺癌鳞状转化。MET扩增在(2/22)EGFR 19delins组中发生,ERBB2扩增在1/25EGFR 19del队列中发生。

          EGFR 19delins和EGFR 19del一线TKI治疗后耐药机制

接着,我们分析了奥希替尼作为二线治疗在发生T790M突变后的EGFR 19delins患者(n= 8)EGFR 19del患者(n=10)的临床效益。EGFR 19delins组和EGFR 19del组的治疗应答相似:ORR 62.5% vs 30.0%, p =0.34;DCR: 100.0% vs 80.0%, p =0.48。此外,EGFR 19delins组和EGFR 19del组的mPFS无显著差异(mPFS: 12个月vs 12.2个月;Log-rank检验,p =0.97)。

          EGFR 19delins和EGFR 19del二线奥希替尼治疗疗效评估

综上,研究表明,罕见EGFR 1919delins突变患者使用第一代EGFR-TKI治疗疗效与常见EGFR 19del突变患者相当,且耐药机制基本类似,获得T790M突变对奥希替尼应答类似。

 

原始出处:

Wang Y, Zheng R, Hu P, Zhang Z, Shen S, Li X. Patients harboring uncommon EGFR exon 19 deletion-insertion mutations respond well to first-generation EGFR inhibitors and osimeritinib upon acquisition of T790M. BMC Cancer. 2021 Nov 13;21(1):1215. doi: 10.1186/s12885-021-08942-x. PMID: 34774017; PMCID: PMC8590339.

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    2022-10-18 zhlpower
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    2021-12-19 ms7000000564356848

    好!

    0

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    2021-12-18 lsj628
  6. [GetPortalCommentsPageByObjectIdResponse(id=1975137, encodeId=68e719e513774, content=<a href='/topic/show?id=f145355379' target=_blank style='color:#2F92EE;'>#BMC#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=37, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=3553, encryptionId=f145355379, topicName=BMC)], attachment=null, authenticateStatus=null, createdAvatar=https://thirdqq.qlogo.cn/qqapp/101173734/363C99735735B7F4CB11D5F78F580525/100, createdBy=aab22500211, createdName=ms3025846204744509, createdTime=Mon Nov 28 08:10:49 CST 2022, time=2022-11-28, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1795269, encodeId=c8c41e9526950, content=<a href='/topic/show?id=98f91e05925' target=_blank style='color:#2F92EE;'>#T790M#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=44, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=17059, encryptionId=98f91e05925, topicName=T790M)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=c838337, createdName=zhlpower, createdTime=Tue Oct 18 17:10:49 CST 2022, time=2022-10-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1081878, encodeId=840310818e846, content=好!, beContent=null, objectType=article, channel=null, level=null, likeNumber=46, replyNumber=0, topicName=null, topicId=null, topicList=[], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=a6ea5684942, createdName=ms7000000564356848, createdTime=Sun Dec 19 20:11:31 CST 2021, time=2021-12-19, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1383099, encodeId=ecce1383099cf, content=<a href='/topic/show?id=0c8265e2b3' target=_blank style='color:#2F92EE;'>#EGFR-TKI#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=38, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=6572, encryptionId=0c8265e2b3, topicName=EGFR-TKI)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=6732482, createdName=w984445tii, createdTime=Sat Dec 18 04:10:49 CST 2021, time=2021-12-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1384244, encodeId=9b2513842446d, content=<a href='/topic/show?id=14bb1e503a0' target=_blank style='color:#2F92EE;'>#TKI#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=44, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=17503, encryptionId=14bb1e503a0, topicName=TKI)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=b73f484, createdName=lsj628, createdTime=Sat Dec 18 04:10:49 CST 2021, time=2021-12-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1534600, encodeId=de57153460082, content=<a href='/topic/show?id=22b3e9887e' target=_blank style='color:#2F92EE;'>#GFR#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=25, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=7988, encryptionId=22b3e9887e, topicName=GFR)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=f0a812532020, createdName=liuyiping, createdTime=Sat Dec 18 04:10:49 CST 2021, time=2021-12-18, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1619087, encodeId=268e161908ecd, content=<a href='/topic/show?id=492a42862bd' target=_blank style='color:#2F92EE;'>#外显子#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=37, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=42862, encryptionId=492a42862bd, topicName=外显子)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=a12645, createdName=docwu2019, createdTime=Sat Dec 18 04:10:49 CST 2021, time=2021-12-18, status=1, ipAttribution=)]
    2021-12-18 liuyiping
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