The collected Chapters in this volume describe the current status of poly(ethylene glycol) (PEG) modification of proteins, peptides, oligonucleotides and small molecule drugs, the recent advances in conjugation chemistry, and new clinical products. The book provides an excellent update in this rapidly evolving field, and the comprehensive collection of Chapters complements well past reviews/volumes that have documented the evolution of PEGylation. For example, a reader new to this field is encouraged to gain the historical perspective by reading the following reviews [1–8]. Only then is it possible to see just how far this field has come and understand that it has already established a new class of therapeutics as.
