Metabolic outcomes in a randomized trial of nucleoside, nonnucleoside and protease inhibitor-sparing regimens for initial HIV treatment.
BACKGROUND
The metabolic effects of initial therapy for HIV-1 infection are important determinants of regimen selection.


METHODS
Open-label study in 753 subjects randomized equally to efavirenz or lopinavir/ritonavir(r) plus two nucleoside reverse-transcriptase inhibitor (NRTI) vs. the NRTI-sparing regimen of lopinavir/r plus efavirenz. Zidovudine, stavudine, or tenofovir with lamivudine was selected prior to randomization. Metabolic outcomes through 96 weeks were lipoatrophy, defined as at least 20% loss in extremity fat, and fasting serum lipids.


RESULTS
Lipoatrophy by dual-energy X-ray absorptiometry at week 96 occurred in 32% [95% confidence interval (CI) 25-39%] of subjects in the efavirenz plus two NRTIs arm, 17% (95% CI 12-24) in the lopinavir/r plus two NRTIs arm, and 9% (95% CI 5-14) in the NRTI-sparing arm (P < or = 0.023 for all comparisons). Varying the definition of lipoatrophy (> or =10 to > or =40% fat loss) and correction for baseline risk factors did not affect the significant difference in lipoatrophy between the NRTI-containing regimens. Lipoatrophy was most frequent with stavudine-containing regimens and least frequent with tenofovir-containing regimens (P < 0.001), which were not significantly different from the NRTI-sparing regimen. Total cholesterol increases at week 96 were greatest in the NRTI-sparing arm (median +57 mg/dl) compared with the other two arms (+32-33 mg/dl; P < 0.001). Use of lipid-lowering agents was more common (25 vs. 11-13%) in the NRTI-sparing arm.


CONCLUSIONS
Lipoatrophy was more frequent with efavirenz than lopinavir/r when combined with stavudine or zidovudine, and less frequent when either drug was combined with tenofovir. Lipoatrophy was least frequent with the NRTI-sparing regimen, but this benefit was offset by greater cholesterol elevations and the need for lipid-lowering agents.
Haubrich
Richard H
RH
University of California San Diego, San Diego, California 92103, USA. rhaubrich@ucsd.edu
Riddler
Sharon A
SA
DiRienzo
A Gregory
AG
Komarow
Lauren
L
Powderly
William G
WG
Klingman
Karin
K
Garren
Kevin W
KW
Butcher
David L
DL
Rooney
James F
JF
Haas
David W
DW
Mellors
John W
JW
Havlir
Diane V
DV
D015502:Absorptiometry, Photon; D000328:Adult; D000480:Alkynes; D048588:Benzoxazines / Q000008:administration & dosage / Q000009:adverse effects; D003521:Cyclopropanes; D005260:Female; D015658:HIV Infections / Q000097:blood / Q000188:drug therapy*; D017320:HIV Protease Inhibitors / Q000008:administration & dosage* / Q000009:adverse effects; D015497:HIV-1; D039682:HIV-Associated Lipodystrophy Syndrome / Q000139:chemically induced* / Q000378:metabolism; D006801:Humans; D050356:Lipid Metabolism / Q000187:drug effects*; D061466:Lopinavir; D008297:Male; D011744:Pyrimidinones / Q000008:administration & dosage / Q000009:adverse effects; D019438:Ritonavir / Q000008:administration & dosage / Q000009:adverse effects
D000480:Alkynes; D048588:Benzoxazines; D003521:Cyclopropanes; D017320:HIV Protease Inhibitors; D011744:Pyrimidinones; D061466:Lopinavir; C098320:efavirenz; D019438:Ritonavir