Survival analysis of two controlled trials of rifabutin prophylaxis against Mycobacterium avium complex in AIDS

AIDS
R D Moore, R E Chaisson

Abstract

Rifabutin prophylaxis has been shown to significantly decrease the incidence of Mycobacterium avium complex (MAC) bacteremia in two randomized controlled clinical trials, but a survival benefit has not been observed. An analysis of complete follow-up of these patients through August 1992 was performed to assess subsequent survival, because although follow-up in the previous trials was limited at the time of initial analysis, the analysis did suggest that a survival benefit might be emerging. Data from 1146 AIDS patients with CD4+ counts < or = 200 x 10(6)/l enrolled at 73 US and Canadian sites in two clinical trials of MAC prophylaxis were analyzed using Cox proportional hazards analysis with rifabutin use modeled as a time-dependent covariate, taking into account the initial randomized double-blind phase of the trials and the subsequent open-label phase of follow-up of those patients. Survival from date of enrollment was analyzed. Other covariates adjusted for in the analysis were CD4+ lymphocytes count, Karnofsky performance score and hospitalization for opportunistic complications of AIDS. Patients who received open-label rifabutin may have had a better prognosis than those who did not, based on Karnofsky score and occurrenc...Continue Reading

Citations

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