Head and neck squamous cell carcinomas (HNSCCs) belong to a group of diverse tumors, which can be induced by infection with human papillomavirus (HPV) or tobacco and alcohol consumption. The viral etiology of HNSCC relates to better clinical outcomes reflecting a different immune system response. Here, we retrospectively analyzed 97 tissue samples from oral and oropharyngeal carcinomas associated and non-associated with HPV infection using multispectral fluorescent immunohistochemistry. To evaluate the immune cell infiltration in tumor and stroma compartments, we designed four panels of four to five antibodies. We detected more T lymphocytes in the stroma, compared to the tumor parenchyma. In HPV positive (HPV+) in comparison to HPV negative (HPV-) tumors, higher counts of CD3+CD4+, CD3+CD8+, PD1+CD4+, PD1+CD8+ T cells, and ICOS- Treg cells were detected while more ICOS+ Treg cells and CTLA4+CD4+ T cells were observed in HPV- than in HPV+ tumors. The results of the univariate and multivariate analyses confirmed the predominant impact of HPV status on prognosis. More importantly, the number of CD8+PD-1+ T cells was identified as an independent factor, influencing the overall and/or disease-specific survival of patients with oral cavity or oropharyngeal carcinomas.

Department of Genetics and Microbiology Faculty of Science Charles University BIOCEV 252 50 Vestec Czech Republic

Department of Mathematical Analysis and Applications of Mathematics Faculty of Science Palacky University in Olomouc 771 46 Olomouc Czech Republic

Department of Otorhinolaryngology and Head and Neck Surgery 1st Faculty of Medicine Charles University University Hospital Motol 150 06 Prague Czech Republic

Department of Pathology and Molecular Medicine 2nd Faculty of Medicine Charles University 150 06 Prague Czech Republic

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