近年来随着疾病早期筛查以及靶向治疗、免疫治疗等多模式治疗的推进,肺癌疾病诊疗取得了重大进展,肺癌的5年生存率也随之提高。
对于早期非小细胞肺癌(NSCLC)患者,不同特征人群的疾病预后也有一定差异。通过对NSCLC患者的生物标志物动态监测,可及早提示耐药信息,以便进行早期干预,有利于患者获得更高的生存质量与更长的生存时间。今天小编给大家分享两篇2023欧洲肿瘤内科学会(ESMO)年会发布的前沿研究,这两项研究是关于早期NSCLC围手术期患者术前和术后多基因检测以及PD-L1表达检测一致性的比较,从而使早期肺癌生物标志物检测成为用药指导以及预后预测的工具。
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1.
通过多基因检测对早期NSCLC围手术期患者靶向治疗进行基因组筛选(摘要号:1276P)
[1]
最近有几项针对肿瘤基因驱动的NSCLC围手术期靶向治疗的临床试验正在进行中。作为日本一项多中心前瞻性基因组筛查研究(LC-SCRUM-Advantage/MRD)的一部分,本研究评估了通过术前活检肿瘤样本进行多基因检测的可行性,以检测早期可手术NSCLC患者中的驱动基因情况。
可手术且临床分期为I至III期的NSCLC患者均可纳入本研究,并在术前收集活检肿瘤样本,进行 AmoyDx Pan Lung Cancer PCR Panel(Multi-PCR 检测),检测基因包括EGFR、ALK、ROS1、KRAS、BRAF、HER2、RET、MET和NTRK基因在内的驱动基因。在手术后再次采集肿瘤样本,并使用新一代测序系统Oncomine Precision Assay (OPA)分析50种基因改变。
在2022年8月至2023年4月期间,共有193名患者参与LC-SCRUM-Advantage/MRD研究。最终有77例患者纳入研究分析中,其中40例(52%)为I期,23例(30%)为II期,14例(18%)为III期;57例(74%)患者的组织学分型为腺癌。
研究结果提示,术前样本的Multi-PCR检测的成功率为96%,中位周转时间(median turnaround time,TAT)为4天,检测到致癌驱动基因的频率为:29例(39%)为EGFR突变(16例,L858R;10例,ex19del;3例,不常见);9例为(12%)KRAS(4例,G12C;5例,non-G12C);2例(3%)为HER2 ex20ins;1例(2%)RET融合。在完成手术以及术后手术样本OPA分析的患者中,OPA的成功率为98%,并且中位TAT为6天。术前活检和手术样本中检测到的可采取靶向治疗驱动基因的一致率为98%(49/50),其中有一名患者仅在术后样本的OPA中检测到了KRAS G12D。
结论:通过术前活检肿瘤样本进行基因组筛查时,Multi-PCR检测组成功率很高,并且TAT时间很短。Multi-PCR检测组有助于更好地检测早期NSCLC患者的致癌驱动基因。
▌2.早期NSCLC术前组织活检与手术标本中PD-L1表达的一致性(摘要号:1282P)
[2]
确定程序性死亡配体1(PD-L1)的表达水平有助于辨认能从免疫检查点抑制剂治疗中获益的早期NSCLC围手术期患者。作为LC-SCRUM-Advantage/MRD多中心前瞻性基因组筛查研究的一部分,本研究评估了活检和匹配的手术标本之间PD-L1表达水平的一致性。
研究纳入了术前未经治疗的、可切除、临床分期I至III期的NSCLC 患者。采用22C-3免疫组化检测法,对可手术NSCLC患者的术前肺活检样本和匹配手术样本进行PD-L1肿瘤细胞阳性比例评分(tumor Proportion Score,TPS)分析。表达阳性的cutoff值判定为:TPS<1%、TPS≥1%~49%、TPS≥50%。
2022年8月至2023年4月期间,LC-SCRUM-Advantage/MRD共招募了181名患者。在本次研究分析的62例可评估患者中,有33例(53%)/17例(28%)/12例(19%)患者分别为I/II/IIA期,46例(74%)组织学提示腺癌,54例(85%)在术前通过支气管镜活检并确诊。活检标本中PD-L1 TPS分析的成功率为98%,TAT为7天(四分位数范围为3-13)。在活检标本中,PD-L1的TPS<1%的患者有34例(56%)、TPS≥ 1~49%有17例(28%)和TPS≥50%有9例(16%)。另一方面,对所有手术标本进行成功分析后,PD-L1 TPS<1%、TPS≥ 1~49%和TPS≥50%的患者分别为22例(48%)、15例(32%)和9例(20%)。
研究结果提示术前活检标本与匹配的手术标本PD-L1 TPS总吻合率为74%(35/47)。其中PD-L1 TPS<1%的吻合率为91%(20/22)、TPS≥ 1~49%吻合率为53%(8/15)和TPS≥50%吻合率为67%(6/9)。并将进一步细分活检标本和匹配的手术标本中不一致的TPS ≥1~49%患者,有86%(6/7)在活检标本中TPS评分<1%。
结论:在早期 NSCLC 患者中,术前活检标本与手术标本之间的 PD-L1 TPS评分吻合率较高。但PD-L1 TPS 评分1~49%的吻合率相对较低,可能是在活检标本中低估了TPS。
点评
总之,这些研究结果提示,早期肺癌术前的多基因检测以及PD-L1表达检测与术后的一致性较高,或对患者的治疗、预后有一定参考价值。其中一个研究术前组织活检与术后手术样本的吻合度,提示两者的PD-L1表达吻合率存在一定差异,这也提示不同时间节点的活检结果可能有所不同,因此患者在诊疗全程的动态检测对临床治疗具有重要的价值。此外,另一个研究探讨了术前驱动基因检测的意义,近些年来,随着靶向治疗在新辅助/辅助治疗的研究探索,在肺癌早期阶段进行基因检测或有助于围术期用药,当然,这还有待更多的研究探索进行揭晓。相信在未来,随着肺癌生物标志物检测的不断探索和优化,必将让治疗更“有迹可循”,从而让更多的患者生存获益。
参考文献:
[1]K. Yoh, Y. Zenke, S. Kitagawa, et al. Genomic screening by multi-gene assay for perioperative targeted therapy in patients with early-stage non-small cell lung cancer: LC-SCRUM-Advantage/MRD. 2023 ESMO abstracts. 1276P
[2]Y. Zenke, K. Yoh, S. Kitagawa,et al.Concordance of PD-L1 expression between biopsy and matched surgical specimen in early-stage non-small cell lung cancer: LC-SCRUM-Advantage/MRD.2023 ESMO abstracts. 1282P
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#259c5c;--weui-FG: #fff;--weui-BG: #000;--weui-TAG-TEXT-RED: rgba(250, 81, 81, .6);--weui-TAG-BACKGROUND-RED: rgba(250, 81, 81, .1);--weui-TAG-TEXT-ORANGE: rgba(250, 157, 59, .6);--weui-TAG-BACKGROUND-ORANGE: rgba(250, 157, 59, .1);--weui-TAG-TEXT-GREEN: rgba(6, 174, 86, .6);--weui-TAG-BACKGROUND-GREEN: rgba(6, 174, 86, .1);--weui-TAG-TEXT-BLUE: rgba(16, 174, 255, .6);--weui-TAG-BACKGROUND-BLUE: rgba(16, 174, 255, .1);--weui-TAG-TEXT-BLACK: rgba(255, 255, 255, .5);--weui-TAG-BACKGROUND-BLACK: rgba(255, 255, 255, .05)}}@media screen and (min-width:1024px) and (prefers-color-scheme:dark){body:not(.pages_skin_pc) .wx-root:not([data-weui-theme=light]),body:not(.pages_skin_pc) body:not([data-weui-theme=light]){--appmsgExtra-BG: #121212}}@media(prefers-color-scheme:dark){body:not([data-weui-theme=light]).my_comment_empty_data{background-color:#111}}body,.wx-root{--weui-BG-6: rgba(0, 0, 0, .05);--weui-ACTIVE-MASK: rgba(0, 0, 0, .05)}body,.wx-root{--weui-REDORANGE: #ff6146;--weui-BG-0: 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