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HIV-1 DNA Testing in Viremic Patients Identifies More Drug Resistance Than HIV-1 RNA Testing. | LitMetric
Background : The Department of Health and Human Services HIV-1 Treatment Guidelines recommend drug resistance testing in HIV-1 RNA to guide the selection of antiretroviral therapy in patients with viremia. However, resistance-associated mutations (RAMs) in HIV-1 RNA may reflect only the patient's current regimen and can be lost during prolonged absence of therapy. We determined if HIV-1 DNA testing can provide drug resistance information beyond that identified in contemporaneous plasma virus.Methods : This was a retrospective database review of results obtained for patients with viremia for whom commercial HIV-1 RNA and HIV-1 DNA drug resistance testing was ordered on the same day. Resistance-associated mutations and drug susceptibility calls were compared between paired tests, and the effect of HIV-1 viral load (VL) on test concordance was assessed using Spearmen's rho correlation.Results : Among 124 paired tests, more RAMs were identified in HIV-1 DNA in 63 (50.8%) cases, and in HIV-1 RNA in 11 (8.87%) cases. HIV-1 DNA testing captured all contemporaneous plasma virus RAMs in 101/117 (86.3%) cases and identified additional RAMs in 63/117 (53.8%) cases. There was a significant positive correlation between the viral load at the time of resistance testing and the percentage of plasma virus RAMs detected in HIV-1 DNA (r = 0.317; < .001). In 67 test pairs demonstrating pan-sensitive plasma virus, resistance in HIV-1 DNA was seen in 13 (19.4%) cases.Conclusions : HIV-1 DNA testing identified more resistance than HIV-1 RNA testing in most patients with viremia and may be informative in patients whose plasma virus reverts to wild-type following therapy discontinuation.
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