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  • Title: Safety and efficacy of polyethylene glycol-modified interleukin-2 and zidovudine in human immunodeficiency virus type 1 infection: a phase I/II study.
    Author: Wood R, Montoya JG, Kundu SK, Schwartz DH, Merigan TC.
    Journal: J Infect Dis; 1993 Mar; 167(3):519-25. PubMed ID: 8095058.
    Abstract:
    The safety and efficacy of combined therapy with polyethylene glycolated (PEG) interleukin (IL)-2 and zidovudine was assessed in 19 human immunodeficiency virus type 1 (HIV-1)-seropositive subjects in a phase I/II open-label dose-ranging study. During courses of three weekly infusions of PEG IL-2, dose-limiting side effects were seen at 5 x 10(6) IU/m2 and reversible encephalopathy in 1 subject at 3 x 10(6) IU/m2. Significant increases were seen in CD4 cell counts (P < .01), NK cell activity (P < .05), and HIV-specific cytotoxicity (P < .01). Virologic monitoring (quantitative DNA polymerase chain reaction and p24 antigen assay) showed no evidence of increased HIV activation. Patients with CD4 cells < 200/mm3 were entered into a chronic dosing phase. PEG IL-2 was given at 14-day intervals at doses of 10(6) IU/m2 for 8 weeks and 3 x 10(6) IU/m2 for up to 16 weeks, resulting in mean CD4 cell count elevations of 16% and 33%, respectively. PEG IL-2 appears to warrant further investigation, especially in subjects with CD4 cell counts < 200/mm3, to determine whether increased lymphocyte numbers will translate into improved clinical outcome.
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