CXCL8 and cancer: In our current investigation, a comprehensive meta‐analysis was executed to elucidate the potential correlation between six IL‐8 polymorphisms and the susceptibility to various types of cancer, which had two advantages: on one hand, current study included the most largest samples than previous meta‐analysis, on the other hand, serum IL‐8 expression was added, and was analyzed the relationship between different genotypes and IL‐8 expression, which was the novel exploration.