PPBP and head and neck squamous cell carcinoma: High levels (> third quartile) of CXCL1-8 except CXCL7 correlated with shorter DFS/PFS and OS for RCC patients whereas only CXCL1 and CXCL3 or CXCL1 and CXCL8 correlated with shorter DFS/PFS and OS, respectively for HNSCC patients (Table 1A, B).