CD8A and head and neck squamous cell carcinoma: We first explored the difference between cumulative survival between HNSCC, HNSCC-HPV-pos and HNSCC-HPV-neg tumors and found that HNSCC-HPV-pos group had a significantly higher infiltration of B cells, CD8+ T cells and neutrophil cells (P<0.05), which was positively related to CDCAs expression.