IL6 and cystic fibrosis: Inflammation is one of the most common complications of CF, mainly caused by recurrent opportunistic infections, the most common being Pseudomonas aeruginosa, Staphylococcus aureus, and Haemophilus influenza, leading to the production of several proinflammatory cytokines, such as IL-8, IL-6, IL-1β, IL-18, and TNF (5).