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- W1978590976 abstract "Kaposi's sarcoma (KS), the most common malignancy associated with HIV infection, is caused by the Kaposi sarcoma herpesvirus (KSHV). Exacerbations of KSHV are associated with increased human interleukin-6 (HuIL-6), and elevated IL-6 could be related to the development of KS. IL-4, a cytokine with pleiotropic effects, suppresses IL-6 in vivo and modestly inhibits AIDS-KS-derived cells in vitro. Suppression of IL-6 by exogenous IL-4 could result in antitumor activity. We report the results of a clinical trial to test this hypothesis. A phase I/II dose escalation safety, tolerance, and efficacy trial was conducted in patients with biopsy-proven AIDS-related KS, at two university medical centers. Patients were scheduled to receive IL-4 (0.5, 1.5, 3.0, or 4.0 μg/kg/day) administered subcutaneously (s.c.) in sequential cohorts. Patients were continued on study as long as the drug was tolerated or the disease progressed. Patients were followed for antitumor activity, effects on viral replication, immune status, and clinical and laboratory toxicity. Seventeen patients were enrolled at two sites over a 21-month period. There were 15 males and 2 females, and 1 patient was Hispanic. All patients had a Karnofsky score >70. Patients enrolled only into the two lower dose cohorts (0.5 and 1.5 μg/kg/day). Both groups had similar baseline characteristics. The median time on treatment was only 7.4 and 8.4 weeks for the 0.5 and 1.5 μg/kg/day dose levels, respectively. There was significant neutropenia, with 6 patients having grade 3 or greater toxicity requiring granulocyte colony-stimulating factor (G-CSF). Three patients on a dose of 1.5 μg/kg/day stopped treatment due to protocol-defined toxicity. There were no appreciable effects on CD4/CD8 counts. HIV viral RNA did not significantly change over time. However, in several people, it appeared to decline with treatment and rebound with discontinuation of treatment. Corresponding changes were noted in the HIV immunocomplex dissociated (ICD) p24 antigen. One patient had a partial response, 11 patients had stable disease, and 5 patients had disease progression during the short period of treatment. The maximum tolerated dose for IL-4 in patients with advanced AIDS-related KS is 1.5 μg/kg/day. At this dose level, IL-4 is poorly tolerated and is not an effective KS treatment. Treatment of the majority of patients is discontinued because of drug-related toxicity or because of disease progression. Future studies of IL-4 should be confined to studies of cytokine manipulation of the underlying HIV infection, as there appears to be little antitumor activity." @default.
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- W1978590976 date "2002-11-01" @default.
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- W1978590976 title "Lack of Antitumor Activity and Intolerance of Interleukin-4 in Patients with Advanced HIV Disease and Kaposi's Sarcoma" @default.
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- W1978590976 doi "https://doi.org/10.1089/10799900260442575" @default.
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