TY - JOUR
T1 - Greater viral rebound and reduced time to resume antiretroviral therapy after therapeutic immunization with the ALVAC-HIV vaccine (vCP1452)
AU - Autran, Brigitte
AU - Murphy, Robert L.
AU - Costagliola, Dominique
AU - Tubiana, Roland
AU - Clotet, Bonaventura
AU - Gatell, Jose
AU - Staszewski, Schlomo
AU - Wincker, Norma
AU - Assoumou, Lambert
AU - El-Habib, Raphaelle
AU - Calvez, Vincent
AU - Walker, Bruce
AU - Katlama, Christine
PY - 2008/7/11
Y1 - 2008/7/11
N2 - Objective: Evaluate immunogenicity and clinical efficacy of two immunization strategies with the ALVAC-HIV-recombinant canarypox vaccine (vCP1452) in treated HIV-infected patients. DESIGN:: Randomized, double-blind, placebo-controlled, phase II study of vCP1452 immunization in chronically HIV-infected patients on therapy with CD4 T-cell count more than 350 cells/μl, CD4 nadir less than 400 cells/μl and pHIV-RNA less than 400 copies/ml. Patients were equally randomized to four injections at weeks 0, 4, 8, 20; three injections at weeks 4, 8, 20; and placebo. The primary endpoint was vaccine immunogenicity at week 24 measured by enzyme-linked immunospot- interferon-γ against the HIV-gag-reverse transcriptase-nef vaccine sequences. Secondary endpoints included time to treatment resumption and viral quantitation following treatment interruption at week 24. Criteria to resume therapy included CD4 T-cell count decline less than 250 cells/μl or 50% decrease from baseline or pHIV-RNA more than 50 000 copies/ml. Results: Sixty-five patients enrolled. Changes from baseline in HIV-specific T cells in the four injection arms (+480 spot-forming cells/M-peripheral blood mononuclear cell) were significant compared to placebo (+8; P ≤ 0.014), but not in the three injection arms (+322). The week 36 pHIV-RNA (log10 copies/ml) after treatment interruption was higher in the four (4.71; P ≤ 0.023) and three (4.82; P ≤ 0.009) injection arms compared to placebo (4.40). Percentages of patients reaching treatment resumption criteria by week 48 were 74, 55 and 23% in the three respective arms (P ≤ 0.013). Two independent factors influenced time to therapy resumption: immunization (hazards ratio ≤ 2.7, P ≤ 0.048 for three injections; hazards ratio ≤ 4.1, P ≤ 0.003 for four injections) and CD4 nadir (hazards ratio ≤ 0.4, P ≤ 0.002). Conclusions: Significant immunogenicity was induced by vCP1452; however, this strategy was independently associated with a shorter time to resume therapy and higher viral rebound.
AB - Objective: Evaluate immunogenicity and clinical efficacy of two immunization strategies with the ALVAC-HIV-recombinant canarypox vaccine (vCP1452) in treated HIV-infected patients. DESIGN:: Randomized, double-blind, placebo-controlled, phase II study of vCP1452 immunization in chronically HIV-infected patients on therapy with CD4 T-cell count more than 350 cells/μl, CD4 nadir less than 400 cells/μl and pHIV-RNA less than 400 copies/ml. Patients were equally randomized to four injections at weeks 0, 4, 8, 20; three injections at weeks 4, 8, 20; and placebo. The primary endpoint was vaccine immunogenicity at week 24 measured by enzyme-linked immunospot- interferon-γ against the HIV-gag-reverse transcriptase-nef vaccine sequences. Secondary endpoints included time to treatment resumption and viral quantitation following treatment interruption at week 24. Criteria to resume therapy included CD4 T-cell count decline less than 250 cells/μl or 50% decrease from baseline or pHIV-RNA more than 50 000 copies/ml. Results: Sixty-five patients enrolled. Changes from baseline in HIV-specific T cells in the four injection arms (+480 spot-forming cells/M-peripheral blood mononuclear cell) were significant compared to placebo (+8; P ≤ 0.014), but not in the three injection arms (+322). The week 36 pHIV-RNA (log10 copies/ml) after treatment interruption was higher in the four (4.71; P ≤ 0.023) and three (4.82; P ≤ 0.009) injection arms compared to placebo (4.40). Percentages of patients reaching treatment resumption criteria by week 48 were 74, 55 and 23% in the three respective arms (P ≤ 0.013). Two independent factors influenced time to therapy resumption: immunization (hazards ratio ≤ 2.7, P ≤ 0.048 for three injections; hazards ratio ≤ 4.1, P ≤ 0.003 for four injections) and CD4 nadir (hazards ratio ≤ 0.4, P ≤ 0.002). Conclusions: Significant immunogenicity was induced by vCP1452; however, this strategy was independently associated with a shorter time to resume therapy and higher viral rebound.
KW - Canarypox
KW - HIV
KW - Therapeutic vaccine
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U2 - 10.1097/QAD.0b013e3282fdce94
DO - 10.1097/QAD.0b013e3282fdce94
M3 - Article
C2 - 18580611
AN - SCOPUS:49849090609
SN - 0269-9370
VL - 22
SP - 1313
EP - 1322
JO - AIDS
JF - AIDS
IS - 11
ER -