IL17A and Buschke-Ollendorff syndrome: In BALF from 36 BOS and 42 stable patients, Vanaudenaerde et al. highlighted the overexpression of genes encoding TGF- β, Il-17, Il-23, and Il-8, as well as Il-1B, Il-2, Il-6, and Il-8, but not TGF-β protein (58).