"The clinical advantage of PEG-IFNa-2B results from the fact that it is very slowly cleared after administration, resulting in a longer terminal elimination half-life (t 1/2 ) and a higher systemic exposure (both AUC and C max ) in both preclinical and clinical studies conferring an increased efficacy compared to IFNa-2B. The pegylation of IFNa- 2B also renders the molecule less immunogenic; Pegasys ® (pegylated Interferon a) is less immunogenic than Roferon ® (native Interferon a). The toxicokinetic profile of PEG-IFNa-2B obtained in a GLP preclinical toxicology study involving the repeated administration of the biopharmaceutical for 13 weeks by the subcutaneous route in Macaca fascicularis. PrimeOA Publications International is one of the leading Open Access Publishers which is publishing 700+ peer-reviewed journals with the support of 50,000+ editorial board members as editorial team and aimed to disseminate the scholarly knowledge to the scientific society. PrimeOA Publications also organizing 3000+ International Scientific Conferences and events yearly all over the world with the support of 1000+ Scientific associations worldwide. Citation: Maraschiello C (2014) The Relevance of Immunogenicity in Preclinical development. J Bioanal Biomed 6: 001-004."