Richard D. Gelber, PhD; William R. Lenderking, PhD; Deborah J. Cotton, MD, MPH; Bernard F. Cole, PhD; Margaret A. Fischl, MD; Aron Goldhirsch, MD; Marcia A. Testa, PhD
▪ Objective: To evaluate the effects of zidovudine therapy in patients with mildly symptomatic HIV infection using Q-TWiST (quality-adjusted: Time Without Symptoms and Toxicity).
▪ Design: Analysis of a previously reported multicenter, randomized, placebo-controlled clinical trial.
▪ Setting: Thirty-two AIDS Clinical Trial units.
▪ Patients: A total of 351 patients with mildly symptomatic HIV infection were assigned to placebo, and 360 patients were assigned to zidovudine, 1200 mg/d.
▪ Measurements: A modified Q-TWiST method for comparing treatments based on time spent without severe symptomatic adverse events and without disease progression. Zidovudine and placebo were compared in a threshold utility analysis considering reduction in quality of life associated with adverse events and disease progression. Adverse events defined by laboratory findings were distinguished from findings representing symptomatic events.
▪ Results: The incidence of severe symptomatic adverse events was 22.8% for the zidovudine group and 15.1% for the placebo group (P = 0.01), but, as previously reported, zidovudine improved progression-free survival relative to placebo (at 18 months, 91% compared with 81%; P = 0.001). In an 18-month period, patients receiving zidovudine went an average of 14.5 months without disease progression or a severe symptomatic adverse event compared with 14.7 months for placebo. The zidovudine group gained 0.9 months without disease progression but lost 1.1 months due to adverse events. Within the 18-month observation period, treatment provided more Q-TWiST than placebo if the quality of life after HIV disease progression was assumed to be 10% to 20% worse than the quality of life after a severe symptomatic adverse event.
▪ Conclusions: The Q-TWiST analysis projects that quality-of-life reductions due to severe symptomatic adverse events might be balanced by the quality-of-life benefits of delayed HIV disease progression for patients who receive zidovudine for mildly symptomatic HIV infection. At currently recommended doses (500 to 600 mg/d, half the dose used in this study) zidovudine therapy is likely to yield a more favorable result.
Gelber RD, Lenderking WR, Cotton DJ, Cole BF, Fischl MA, Goldhirsch A, et al. Quality-of-Life Evaluation in a Clinical Trial of Zidovudine Therapy in Patients with Mildly Symptomatic HIV Infection. Ann Intern Med. 1992;116:961–966. doi: 10.7326/0003-4819-116-12-961
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Published: Ann Intern Med. 1992;116(12_Part_1):961-966.
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