CXCL8 and cancer: An initial literature search identified 451 potentially relevant articles, for which 175 were duplicates, 126 were excluded because they were unrelated to the association between CXCL8 polymorphisms and the risk of cancer (n = 32), clinical trials (n = 16), meta-analyses (n = 28), randomized controlled trials (n = 6), reviews (n = 31), systematic reviews (n = 13), or lacked sufficient data as case-control studies (n = 45).