Lipoprotein changes in HIV-infected antiretroviral-naïve individuals after starting antiretroviral therapy: ACTG Study A5152s

BackgroundDyslipidemia is a frequent complication of antiretroviral therapy (ART) for patients with human immunodeficiency virus infection (HIV). The effects of ART on lipoproteins are less well-understood, and have not been investigated in a prospective study where assignment to ART is randomized.ObjectiveTo evaluate the effects of three class-sparing ART regimens on lipids and lipoproteins.MethodsThis was a substudy of a prospective, multicenter study of treatment-naïve HIV-infected individuals randomly assigned to receive a regimen of nucleoside reverse transcriptase inhibitors (NRTIs) + the non-nucleoside reverse transcriptase inhibitor efavirenz, NRTIs + the protease inhibitor lopinavir/ritonavir, or a NRTI-sparing regimen of efavirenz + lopinavir/ritonavir. Lipoproteins were measured by nuclear magnetic resonance spectroscopy.ResultsAmong the 82 participants, total and small low-density lipoprotein concentrations increased by a median of 152 nmol/L (interquartile range, −49 to +407 nmol/L; P < 0.01) and 130 nmol/L (interquartile range, −98 to +417 nmol/L; P < 0.01), respectively, especially in the arms containing lopinavir/ritonavir (PKW < 0.04). Very-low-density lipoproteins also increased (P < 0.01), with a larger increase in the arms that contained lopinavir/ritonavir (P = 0.022). High-density lipoproteins increased by a median of 6.0 nmol/L (interquartile range, 2.8–10.4 nmol/L; P < 0.01), but differences between arms were not significant (PKW = 0.069). Changes were not related to changes in markers of insulin/glucose metabolism.ConclusionsTotal and small low-density lipoprotein concentrations increased, especially in the arms containing lopinavir/ritonavir, as did increases in total very-low-density lipoproteins. Adverse changes were especially prominent in the arm with efavirenz + lopinavir/ritonavir.