The AUC for CXCL8 (0.8552, p < 0.001) was higher than the AUC for its receptor CXCR2 (AUC = 0.7773, p < 0.001) and classical tumor markers (CEA—AUC = 0.5159 and CA19-9—AUC = 0.6606), and also higher than the AUC for CRP levels (AUC = 0.8488, p < 0.001). The gene discussed is CEACAM5; the disease is neoplasm.