T cells accounted for 78.8 ± 10.9% of CD45+ lymphocytes in tumor samples compared to 80.3 ± 8.1% in non-cancerous mucosa, 62.7 ± 5.9% in peripheral blood mononuclear cells (PBMC) of aged-matched healthy controls (PBMC HC, n = 15) and 66.6 ± 11.7% in peripheral blood samples of HNSCC patients (PBMC HNSCC; Figure 1B, left plot). Here, PTPRC is linked to head and neck squamous cell carcinoma.