CSF3 and hepatitis C virus infection: Among preparations now in clinical use are PEG-asparaginase for treating leukemia, PEGylated interferons for hepatitis C, PEGylated granulocyte colony-stimulating factor for neutropenia, a PEGylated liposomal doxyrubicin for chemotherapy, and a PEGylated antisense oligonucleotide for macular degeneration.