Abstract:
BACKGROUND:In a placebo-controlled trial of the peptide-based therapeutic HIV-1 p24Gag vaccine candidate Vacc-4x, participants on combination antiretroviral therapy (cART) received six immunizations over 18weeks, followed by analytical treatment interruption (ATI) between weeks 28 and 52. Cell-mediated immune responses were investigated as predictors of Vacc-4x effect (VE) on viral load (VL) and CD4 count during ATI. METHODS:All analyses of week 28 responses and fold-changes relative to baseline considered per-protocol participants (Vacc-4x:placebo=72:32) resuming cART after week 40. Linear regression models with interaction tests were used. VE was estimated as the Vacc-4x-placebo difference in log10-transformed VL (VEVL) or CD4 count (VECD4). FINDINGS:A lower fold-change of CD4+ T-cell proliferation was associated with VECD4 at week 48 (p=0.036, multiplicity adjusted q=0.036) and week 52 (p=0.040, q=0.080). A higher fold-change of IFN-γ in proliferation supernatants was associated with VEVL at week 44 (p=0.047, q=0.07). A higher fold-change of TNF-α was associated with VEVL at week 44 (p=0.045, q=0.070), week 48 (p=0.028, q=0.070), and week 52 (p=0.037, q=0.074). A higher fold-change of IL-6 was associated with VEVL at week 48 (p=0.017, q=0.036). TNF-α levels (>median) were associated with VECD4 at week 48 (p=0.009, q=0.009). INTERPRETATION:These exploratory analyses highlight the potential value of investigating biomarkers in T-cell proliferation supernatants for VE in clinical studies.
journal_name
EBioMedicinejournal_title
EBioMedicineauthors
Huang Y,Pantaleo G,Tapia G,Sanchez B,Zhang L,Trondsen M,Hovden AO,Pollard R,Rockstroh J,Ökvist M,Sommerfelt MAdoi
10.1016/j.ebiom.2017.09.028subject
Has Abstractpub_date
2017-10-01 00:00:00pages
195-204issn
2352-3964pii
S2352-3964(17)30382-1journal_volume
24pub_type
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