Impact of NRTI backbone on renal, bone and cardiovascular markers in HIV-infected individuals receiving a boosted protease inhibitor

摘要

IntroductionWe have previously shown in the SSAT 044 study that unconjugated hyperbilirubinaemia in subjects receiving a boosted protease inhibitor (PI/r) has limited impact on renal, cardiovascular (CV) and bone biomarkers, as well as on neurocognitive performance, relative to those receiving PI/r with a normal bilirubin. We present here a secondary analysis comparing markers in those receiving abacavir- vs tenofovir- based antiretroviral therapy (ART).Materials and MethodsThis cross-sectional study included 101 HIV-1 infected individuals stable (HIV RNA6 months) on antiretroviral regimens including tenofovir (TDF)/emtricitabine or abacavir/lamivudine plus a ritonavir boosted PI.ResultsForty-three subjects had normal bilirubin (NBR) levels and 35 had high bilirubin (>2.5 times upper limit); the remaining 23 patients had intermediate bilirubin levels or violated the protocol. The mean age of participants was 48 years; 93% were male and 84% Caucasian; 22 received ABC-based therapy and 78 TDF. No differences were seen in cardiovascular markers: Framingham (10-year risk % median, IQR): ABC 8.1, 5.6–15.3; TDF 9.5, 4.8–13.4 (p=ns); pulse wave velocity and carotid intimal thickness also showed no significant differences. No differences were seen in bone parameters: Calcaneal Stiffness Index (median score, IQR): ABC ?0.5, ?0.8 to 0.8; TDF ?0.5, 1.4–0.4 (p=ns); 10 year FRAX score (% median, IQR): ABC 5.0, 2.4–6.2; TDF 3.6, 2.5–5.8 (p=ns). There were differences in renal parameters as shown in Table 1. We show statistically significant differences in urine protein/creatinine ratio (uPCR) (10 vs 7; p=0.004) and urine albumin/creatinine ratio (uACR) (15 vs 8; p=0.002), with both being higher in the TDF group.Table 1Differences in renal parameters