Apart from CXCL12 and CXCR4 previously mentioned, other neutrophil chemoattractants include CXCL5 and CXCL1 which are detected in patient-derived mesothelial cell supernatants, and CXCL5 also reaches detectable levels in pleural effusion (37). This evidence concerns the gene CXCL5 and Pleural effusion.