Correlation of programmed death-ligand 1 expression in tumour cells between diagnostic small biopsies performed by radial EBUS and surgical specimens of peripheral lung cancer.

IF 3.6 3区 医学 Q1 RESPIRATORY SYSTEM BMJ Open Respiratory Research Pub Date : 2024-10-15 DOI:10.1136/bmjresp-2024-002312
Samy Lachkar, Diane Gervereau, Perrot Loïc, Marielle De Marchi, Helene Morisse, Edouard Dantoing, Nicolas Piton, Luc Thiberville, Mathieu Salaün, Florian Guisier
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Abstract

Background and objective: Expression of programmed death-ligand 1 (PD-L1) in tumour cells (TCs) is predictive of immunotherapy efficacy in non-small cell lung cancer (NSCLC). Small biopsy samples collected by bronchoscopy are often used to diagnose peripheral lung cancer. It is questionable whether these small samples from radial endobronchial ultrasonography (r-EBUS) procedures are representative of PD-L1 expression in TCs.

Methods: We retrieved data of consecutive patients who had surgery for NSCLC and previous r-EBUS biopsy sampling, from 2017 to 2019 in our centre. PD-L1 expression in tumour cells was categorised as <1%, 1%-49% and ≥50%. PD-L1 expression was compared between r-EBUS samples and surgical specimens.

Results: Among 1026 patients who had r-EBUS, 521 had a diagnosis of lung cancer on r-EBUS sample. PD-L1 testing was indicated in 356 cases and results were considered contributive in 325 cases (91%). 82 patients with PD-L1 expression in r-EBUS samples had subsequent surgical resection of the nodule and were included in the study. PD-L1 expression was identical between r-EBUS samples and surgical specimens in 67% of cases, with kappa 0.44 (p<0.001). 82% of patients with PD-L1≥50% in surgical specimens were identified in r-EBUS samples. Nonetheless, 31% of patients with no PD-L1 expression in r-EBUS samples had some expression in surgical specimens.

Conclusion: Small samples obtained by r-EBUS are adequate for assessment of PD-L1 expression in tumour cells, with moderate concordance compared to surgical specimens. Reassessment of PD-L1 expression in larger samples may be useful to guide therapy in patients with no PD-L1 expression in r-EBUS samples.

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径向 EBUS 诊断性小活检与外周肺癌手术标本肿瘤细胞中程序性死亡配体 1 表达的相关性。
背景和目的:肿瘤细胞(TC)中程序性死亡配体 1(PD-L1)的表达可预测非小细胞肺癌(NSCLC)的免疫疗法疗效。支气管镜收集的小活检样本通常用于诊断外周肺癌。这些来自径向支气管内超声检查(r-EBUS)的小样本是否能代表肺癌细胞中 PD-L1 的表达还存在疑问:我们检索了本中心2017年至2019年连续接受NSCLC手术和既往r-EBUS活检取样的患者数据。肿瘤细胞中的 PD-L1 表达分为 结果:在1026名接受过r-EBUS检查的患者中,有521人通过r-EBUS样本确诊为肺癌。356例患者需要进行PD-L1检测,其中325例(91%)的检测结果被认为是有意义的。82例在r-EBUS样本中有PD-L1表达的患者随后进行了结节手术切除,并被纳入研究。在67%的病例中,r-EBUS样本和手术标本的PD-L1表达相同,卡帕值为0.44(p结论:通过r-EBUS获得的小样本足以评估肿瘤细胞中的PD-L1表达,与手术标本相比,两者的一致性适中。对于r-EBUS样本中没有PD-L1表达的患者,在较大样本中重新评估PD-L1表达可能有助于指导治疗。
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来源期刊
BMJ Open Respiratory Research
BMJ Open Respiratory Research RESPIRATORY SYSTEM-
CiteScore
6.60
自引率
2.40%
发文量
95
审稿时长
12 weeks
期刊介绍: BMJ Open Respiratory Research is a peer-reviewed, open access journal publishing respiratory and critical care medicine. It is the sister journal to Thorax and co-owned by the British Thoracic Society and BMJ. The journal focuses on robustness of methodology and scientific rigour with less emphasis on novelty or perceived impact. BMJ Open Respiratory Research operates a rapid review process, with continuous publication online, ensuring timely, up-to-date research is available worldwide. The journal publishes review articles and all research study types: Basic science including laboratory based experiments and animal models, Pilot studies or proof of concept, Observational studies, Study protocols, Registries, Clinical trials from phase I to multicentre randomised clinical trials, Systematic reviews and meta-analyses.
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