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October 17, 2019
Source: J Immunother Cancer. 2019 Oct 17;7(1):261. doi: 10.1186/s40425-019-0726-6.
Authors: K. Hladíková, V. Koucký, J. Bouček, J. Laco, M. Grega, M. Hodek, M. Zábrodský, M. Vošmik, K. Rozkošová, H. Vošmiková, P. Čelakovský, V. Chrobok, A. Ryška, R. Špíšek, A. Fialová
Standard treatment of oropharyngeal squamous cell carcinoma (OPSCC) is associated with high morbidity, whereas immunotherapeutic approaches using PD-1:PD-L1 checkpoint blockade only show moderate response rates in OPSCC patients. Therefore, a better stratification of patients and the development of novel therapeutic protocols are crucially needed. The importance of tumor-infiltrating B cells (TIL-Bs) in shaping antitumor immunity remains unclear; therefore, we analyzed frequency, phenotype, prognostic value and possible roles of TIL-Bs in OPSCC.
We utilized transcriptomic analysis of immune response-related genes in 18 OPSCC samples with respect to human papillomavirus (HPV) status. The density and localization of CD20+, CD8+ and DC-LAMP+ cells were subsequently analyzed in 72 tissue sections of primary OPSCC samples in relation to patients' prognosis. The immunohistochemical approach was supplemented by flow cytometry-based analysis of phenotype and functionality of TIL-Bs in freshly resected primary OPSCC tissues.
We observed significantly higher expression of B cell-related genes and higher densities of CD20+ B cells in HPV-associated OPSCC samples. Interestingly, CD20+ TIL-Bs and CD8+ T cells formed non-organized aggregates with interacting cells within the tumor tissue. The densities of both intraepithelial CD20+ B cells and B cell/CD8+ T cell interactions showed prognostic significance, which surpassed HPV positivity and CD8+ TIL density in stratification of OPSCC patients. High density of TIL-Bs was associated with an activated B cell phenotype, high CXCL9 production and high levels of tumor-infiltrating CD8+ T cells. Importantly, the abundance of direct B cell/CD8+ T cell interactions positively correlated with the frequency of HPV16-specific CD8+ T cells, whereas the absence of B cells in tumor-derived cell cultures markedly reduced CD8+ T cell survival.
Our results indicate that high abundance of TIL-Bs and high density of direct B cell/CD8+ T cell interactions can predict patients with excellent prognosis, who would benefit from less invasive treatment. We propose that in extensively infiltrated tumors, TIL-Bs might recruit CD8+ T cells via CXCL9 and due to a highly activated phenotype contribute by secondary costimulation to the maintenance of CD8+ T cells in the tumor microenvironment.