NCIt definition : A Fab fragment of a recombinant, humanized monoclonal antibody directed against the
proinflammatory cytokine tumor necrosis factor-alpha (TNF-alpha) and conjugated to
polyethylene glycol (PEG), with anti-inflammatory activity. Upon administration, certolizumab
binds to TNF-alpha and prevents the interaction of this cytokine with endogenous cell
surface receptors, thereby rendering TNF-alpha inactive and inhibiting TNF-mediated
inflammatory responses. TNF-alpha is a protein involved in inflammation, cell survival,
and apoptosis. Pegylation of certolizumab allows for an improved pharmacokinetic profile.;