NCIt definition : A covalent conjugate of human recombinant interferon (IFN) lambda-1 (IFN-L1; IL-29),
a type III IFN, and a linear polyethylene glycol (PEG) chain, with antiviral and immunomodulating
activities. Upon administration, peginterferon lambda-1A targets and binds to type
III IFN receptors, which activates the JAK-STAT signaling cascade and upregulates
IFN-stimulated genes (ISGs), leading to cell-mediated immune responses. The PEG chain
of peginterferon lambda-1A lowers the clearance of interferon lambda-1A, thereby extending
the duration of its therapeutic effects. Endogenous IFN-L1 is produced following viral
infection and it plays a key role in innate immune response against the viral pathogens.;