Characteristics of B lymphocyte infiltration in HPV+ head and neck squamous cell carcinoma

Human papillomavirus (HPV) is an important etiological factor of head and neck squamous cell carcinoma (HNSCC). HPV+ HNSCC patients usually have a better prognosis, which probably results from the higher infiltration of B lymphocytes. This study was purposed to detect the infiltration of B lymphocyte subsets and the correlation between B lymphocyte subsets and the prognosis in HPV‐related HNSCC. In this study, 124 HPV+ and 513 HPV− HNSCC samples were obtained from the Gene Expression Omnibus (GEO) database and The Cancer Genome Atlas (TCGA) database for transcriptomic analysis. Infiltration of B lymphocytes subsets was detected with 7 HPV+ HNSCC and 13 HPV− HNSCC tissues through immunohistochemistry and immunofluorescence. One HPV− HNSCC sample was detected with single‐cell sequencing for chemokine analysis. In the results, the infiltration of plasma cells (CD19+CD38+) and memory B cells (MS4A1+CD27+) was higher in HPV+ HNSCC samples. High infiltration of plasma cells and memory B cells was related to a better prognosis. High density of B lymphocytes was positively correlated with high CXCL13 production mainly from CD4+ T lymphocytes in HNSCC. These results indicated that a high density of plasma cells and memory B cells could predict excellent prognosis. CD4+ T lymphocytes might affect B lymphocytes and their subsets through the CXCL13/CXCR5 axis in HNSCC. For the first time, we observed the infiltration and distribution of B lymphocyte subsets around HNSCC tissues by immunohistochemistry and immunofluorescence. We first discovered that the high infiltration of plasma cells (CD19+CD38+) and memory B cells (MS4A1+CD27+) in HPV+ HNSCC microenvironment was related to better prognosis, and CD4+ T cells could affect B lymphocyte infiltration through the CXCL13/CXCR5 axis.