Characterization of tumour mutation burden in patients with non‐small cell lung cancer and interstitial lung disease. Issue 8 (6th November 2019)

• Record Type: Journal Article
• Authors: Kobayashi, Haruki; Serizawa, Masakuni; Naito, Tateaki; Konno, Hayato; Kojima, Hideaki; Mizuno, Tetsuya; Isaka, Mitsuhiro; Endo, Masahiro; Nagashima, Takeshi; Kusuhara, Masatoshi; Urakami, Kenichi; Ohshima, Keiichi; Yamaguchi, Ken; Ohde, Yasuhisa; Takahashi, Toshiaki
• Is Part Of: Respirology. Volume 25:Issue 8(2020)
• Page Start: 850
• Page End: 854
• Publication Date: 2019-11-06
• Subjects: interstitial lung diseases -- lung cancer -- non‐small cell lung cancer -- tumour mutation burden; Respiratory organs -- Diseases -- Periodicals; Respiratory organs -- Periodicals; 612.2
• DOI: 10.1111/resp.13726
• Languages: English
• ISSNs: 1323-7799

Abstract

ABSTRACT: Background and objective: The efficacy expectation of immune checkpoint inhibitors against NSCLC in patients with ILD seems to be high because these populations are supposed to have high TMB. However, information about the characterization of TMB in patients with NSCLC and ILD is limited. Therefore, this study aimed to evaluate TMB in samples of NSCLC with ILD and clarify factors that influence TMB values. Methods: The medical records of patients with NSCLC who underwent thoracic surgery at our institution between January 2014 and January 2017 were retrospectively reviewed. Whole‐exome sequencing with an Ion Proton system and gene expression profiling of fresh surgical specimens were performed. Results: Among 367 patients with NSCLC, 62 (16.9%) were diagnosed with ILD. All samples were collected from primary tumours with a median TMB of approximately 2.1 (range: 0.1–64.4) mutation/Mb. Among 81 squamous cell carcinomas, we compared 27 tumours with concomitant ILD and 54 tumours without ILD. Univariate analyses revealed that tumours with concomitant ILD showed lower TMB values than those without ILD. Multivariate analysis revealed that concomitant ILD was significantly associated with low TMB values. Conversely, no difference was noted in the TMB value of adenocarcinoma between patients with and without ILD. Conclusion: Squamous cell carcinoma and adenocarcinoma with ILD do not have high TMB values. Therefore, considering the risk of severe pneumonitis, immune checkpoint inhibitors should not be used routinely against patients with NSCLC and ILD based on the expectation of high TMB values. Abstract : Patients with NSCLC and ILD did not have high TMB and could develop severe pneumonitis if immune checkpoint inhibitors are used. Therefore, immune checkpoint inhibitors should not be used based on expectations of high TMB in patients with NSCLC and ILD. See related Editorial