Wei-Fa Yang1, May C M Wong2, Peter J Thomson1, Kar-Yan Li2, Yu-Xiong Su3. 1. Oral and Maxillofacial Surgery, Faculty of Dentistry, The University of Hong Kong, Hong Kong Special Administrative Region. 2. Dental Public Health, Faculty of Dentistry, The University of Hong Kong, Hong Kong Special Administrative Region. 3. Oral and Maxillofacial Surgery, Faculty of Dentistry, The University of Hong Kong, Hong Kong Special Administrative Region. Electronic address: richsu@hku.hk.
Abstract
BACKGROUND: Programmed death-ligand 1 (PD-L1) is an immune checkpoint that is primarily located on the surface of tumor cells. PD-L1 expression detected by immunohistochemistry (IHC) assays has been widely studied to predict survival outcomes in head and neck squamous cell carcinoma (HNSCC) recently. We aimed to review comprehensively the prognostic role of PD-L1 expression for survival in HNSCC. METHODS: We systematically searched PubMed, Embase, Web of Science, Cochrane Library and Scopus to identify studies investigating the prognostic role of PD-L1 expression in HNSCC. All studies published before March 31, 2018 were screened. Included studies were assessed using the Quality in Prognosis Studies (QUIPS) tool. Data were extracted and overall survival (OS), disease-free survival (DFS), progression-free survival (PFS), disease-specific survival (DSS) were combined and presented as hazard ratios (HR) with 95% confidence interval (CI) using the generic inverse-variance method. RESULTS: Twenty-three studies with 3105 patients were analysed. The overall positive rate of PD-L1 in HNSCC was 0.42 (95% CI: 0.36-0.48). There was no significant difference between PD-L1-positive and -negative HNSCC patients in OS (HR: 0.98; 95% CI: 0.71-1.37; p = 0.93), DFS (HR: 1.07; 95% CI: 0.68-1.70; p = 0.76), and DSS (HR: 0.90; 95% CI: 0.63-1.29; p = 0.56). An improved PFS was observed in patients with positive PD-L1 expression (HR: 0.71; 95% CI: 0.55-0.93; p = 0.01). In patients with low CD8+ tumor-infiltrating T cells, a poorer OS was detected in patients with positive PD-L1 expression (HR: 1.90; 95% CI: 1.07-3.36; p = 0.03). Patients with HPV-positive HNSCC were associated with increased PD-L1 expression (OR: 1.99; 95% CI: 1.50-2.64; p < 0.001). However, PD-L1 expression showed no significant benefit on OS in HPV-positive HNSCC (HR: 1.04; 95% CI: 0.65-1.65; p = 0.88). CONCLUSIONS: PD-L1 expression detected by IHC was not recommended to predict survival in HNSCC patients. However, the positive PD-L1 expression might predict better PFS in patients with advanced HNSCC. The combined effects of PD-L1 expression and CD8+ tumor-infiltrating T cells should be further elucidated.
BACKGROUND:Programmed death-ligand 1 (PD-L1) is an immune checkpoint that is primarily located on the surface of tumor cells. PD-L1 expression detected by immunohistochemistry (IHC) assays has been widely studied to predict survival outcomes in head and neck squamous cell carcinoma (HNSCC) recently. We aimed to review comprehensively the prognostic role of PD-L1 expression for survival in HNSCC. METHODS: We systematically searched PubMed, Embase, Web of Science, Cochrane Library and Scopus to identify studies investigating the prognostic role of PD-L1 expression in HNSCC. All studies published before March 31, 2018 were screened. Included studies were assessed using the Quality in Prognosis Studies (QUIPS) tool. Data were extracted and overall survival (OS), disease-free survival (DFS), progression-free survival (PFS), disease-specific survival (DSS) were combined and presented as hazard ratios (HR) with 95% confidence interval (CI) using the generic inverse-variance method. RESULTS: Twenty-three studies with 3105 patients were analysed. The overall positive rate of PD-L1 in HNSCC was 0.42 (95% CI: 0.36-0.48). There was no significant difference between PD-L1-positive and -negative HNSCC patients in OS (HR: 0.98; 95% CI: 0.71-1.37; p = 0.93), DFS (HR: 1.07; 95% CI: 0.68-1.70; p = 0.76), and DSS (HR: 0.90; 95% CI: 0.63-1.29; p = 0.56). An improved PFS was observed in patients with positive PD-L1 expression (HR: 0.71; 95% CI: 0.55-0.93; p = 0.01). In patients with low CD8+ tumor-infiltrating T cells, a poorer OS was detected in patients with positive PD-L1 expression (HR: 1.90; 95% CI: 1.07-3.36; p = 0.03). Patients with HPV-positive HNSCC were associated with increased PD-L1 expression (OR: 1.99; 95% CI: 1.50-2.64; p < 0.001). However, PD-L1 expression showed no significant benefit on OS in HPV-positive HNSCC (HR: 1.04; 95% CI: 0.65-1.65; p = 0.88). CONCLUSIONS:PD-L1 expression detected by IHC was not recommended to predict survival in HNSCC patients. However, the positive PD-L1 expression might predict better PFS in patients with advanced HNSCC. The combined effects of PD-L1 expression and CD8+ tumor-infiltrating T cells should be further elucidated.
Authors: Sun Min Lim; Min Hee Hong; Sang-Jun Ha; Daehee Hwang; Sehyun Chae; Yoon Woo Koh; Eun Chang Choi; Se-Heon Kim; Da-Hee Kim; Sun Och Yoon; Hye Ryun Kim Journal: J Cancer Res Clin Oncol Date: 2021-02-22 Impact factor: 4.553
Authors: Mario Sánchez-Canteli; Luis Juesas; Esther Redin; Alfonso Calvo; Fernando López; Aurora Astudillo; Luis M Montuenga; Juana M García-Pedrero; Juan P Rodrigo Journal: Cancers (Basel) Date: 2021-04-25 Impact factor: 6.639