S100A9 and neoplasm: Of these nine Zn-binding proteins, six were found in both tumor samples (AZGP1, Serum albumin, S100A8/Calgranulin-A, S100A9/Calgranulin-B, S100A7/Psoriasin, and Ubiquitin-40S ribosomal protein S27a), one was found only in the HPV-positive tumor sample (Lipocalin-1) and two were found in the HPV-negative tumor sample (Collagen alpha-1(XVIII) chain and Carbonic anhydrase 1).