CXCL8 and Keratoconjunctivitis sicca: For example, Interleukin-8 (IL-8) which has been reported to be elevated in tears of dry eye patients range in concentrations between 74+55pg/ml to 6518+4510 pg/ml when compared to 176+72pg/ml to 1150+50pg/ml in normal tears (57–61).