question: What is the chemical structure of Etanercept (ETN)?
answer: Etanercept (ETN) is a soluble fusion protein of the tumor necrosis factor receptor (TNFR) extracellular domain, linked to an Fc part of IgG1. It possesses three N- and 13 O-glycosylation sites, which form a complex with the plasma membrane protein Enbrel. Etanercept has been tested for treatment of solid cancers, including  glioblastoma and neuroblastoma, and liver fibrosis.