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Here, a multiple modes metamaterial absorber with four peaks was proposed and verified. All absorption peaks were excited by the multiple modes coupling between adjacent unit cells. By increasing the structural parameter D, absorption peaks were strengthened and shifteded to the low-frequency region. When the lattice constant P was increased, these peaks were decreased and shifteded to the high-frequency region. Similarly, when the dielectric layer thickness t3 was gradually increased, these absorption peaks were weakened. Temperature was gradually increased, these absorption peaks were gradually reduced and shifteded to the high-frequency region. The multi-mode coupling effetct between unit cells was important to the performance of the metamaterial absorber. [ABSTRACT FROM AUTHOR]

Background: Lymphoepithelioma-like carcinoma (LELC) of the lung is a rare type of non-small cell lung cancer (NSCLC), and researches of it are still not enough., Methods: In this study, we retrospectively analyzed 36 patients with LELC diagnosed in the Fifth Affiliated Hospital of Sun Yat-sen University and Zhaoqing First People's Hospital from January 2014 to June 2021, to investigate the clinical manifestations, tumor markers, treatment, and prognosis of LELC. Clinical data including age, gender, smoking history, family history of cancers, Epstein-Barr virus (EBV) encoding RNA (EBER) status, gene mutations, programmed death-ligand 1 (PD-L1) expression, treatment, and prognosis., Results: There was a total of 36 participants in this study, 16 males and 20 females, the median age was 57 years (37-76 years). A total of 22 cases (61.1%) were advanced (stage III and IV), and EBER was 94.4% positive. Most patients were treated with surgery, platinum chemotherapy, or radiotherapy. At the time of 31 June 2021, 33 participants had survived, and the longest survival time was 72 months. Lung LELC was more common in old participants (≥59 years) and was not associated with smoking history. Expression of PD-L1 was positive in the majority (27 cases, 75%) and participants with positive PD-L1 expression tended to have longer progression-free survival (PFS) and overall survival (OS) time than those with negative PD-L1 expression., Conclusions: Pulmonary LELC usually occurs in non-smoking patients and is associated with EBV infection. Common treatments for tumors include multimodal therapy. The expression of PD-1 may be related to the prognosis of LELC, but more studies are needed to support further optimization of the treatment of LELC., Competing Interests: Conflicts of Interest: All authors have completed the ICMJE uniform disclosure form (available at https://dx.doi.org/10.21037/jtd-21-1369). The authors have no conflicts of interest to declare., (2021 Journal of Thoracic Disease. All rights reserved.)