Abstract:
:Concurrent chemoradiation therapy (CCRT) is the treatment of choice for locally advanced non-small cell lung cancer (LA-NSCLC). Several clinical trials that combine programmed cell death 1 (PD-1) axis inhibitors with radiotherapy are in development for patients with LA-NSCLC. However, the effect of CCRT on programmed cell death ligand-1 (PD-L1) expression on tumor cells is unknown. In this study, we analysed paired NSCLC specimens that had been obtained pre- and post-CCRT. PD-L1 expression on tumor cells was studied by immunohistochemistry. A total of 45 patients with LA-NSCLC were included, among which there were sufficient pre- and post-CCRT specimens in 35 patients. Overall, the percentage of tumor cells with PD-L1 expression significantly decreased between pre- and post-CCRT specimens (P = 0.024). Sixteen, 15, and 4 patients had decreased, unchanged, or increased PD-L1 expression after CCRT, respectively. Median OS of patients with decreased, unchanged, or increased PD-L1 expression was 85.1, 92.8, and 14.6 months, respectively (P < 0.001). In conclusion, the percentage of PD-L1-positive tumor cells significantly decreased after CCRT. Alteration of PD-L1 expression after neoadjuvant CCRT was associated with prognosis in patients with LA-NSCLC. These data should be considered when developing the optimal approach of integrating PD-1 axis inhibitors with CCRT.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Fujimoto D,Uehara K,Sato Y,Sakanoue I,Ito M,Teraoka S,Nagata K,Nakagawa A,Kosaka Y,Otsuka K,Imai Y,Hamakawa H,Takahashi Y,Kokubo M,Tomii Kdoi
10.1038/s41598-017-11949-9subject
Has Abstractpub_date
2017-09-12 00:00:00pages
11373issue
1issn
2045-2322pii
10.1038/s41598-017-11949-9journal_volume
7pub_type
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