CXCL8 and neoplasm: We also analyzed the relationship between the expression level of plasma IL-8 and ALDH1A1 expression in tumor tissues and found that 14 cases in the IL-8 high expression group (N=15) were ALDH1A1 positive expression, while only 1 case in the IL-8 low expression group (N=15) was ALDH1A1 positive (p=0.014).