Based on synonyms in MeSH and EMTREE databases and assuming hyphenated terms will retrieve hyphenated terms as well as those with spaces.
IL-8 OR IL8 OR Alveolar-Macrophage-Chemotactic-Factor-I
OR AMCF-I OR Anionic-Neutrophil-Activating-Peptide OR CXCL8 OR CXCL-8 OR CXC-chemokine-ligand-8
OR CXCL8 OR Granulocyte-Chemotactic-Peptide OR IL8 OR IL-8 OR Interleukin-8 OR Lymphocyte-Derived-Neutrophil-Activating-Peptide
OR lynap OR Macrophage-Derived-Chemotactic-Factor OR monap OR neutrophil-activating-factor
OR neutrophil-activating-peptide OR Neutrophil-Activation-Factor OR neutrophil-attracting-peptide
OR Neutrophil-Chemotactic-Factor OR granulocyte-activating-factor OR granulocyte-activation-factor
OR granulocyte-activating-peptide OR granulocyte-attracting-peptide