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A Research Study to See if a Change in Therapy for HIV Infection Can Improve the Immune Response to Treatment

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The University of Chicago

Status and phase

Completed
Phase 4

Conditions

HIV Infections

Treatments

Drug: Kaletra + Current Dual NRTI Backbone
Drug: Current Regimen

Study type

Interventional

Funder types

Other
Industry

Identifiers

Details and patient eligibility

About

Our goal is to determine if a change in therapy to one containing Kaletra can improve the immune response in patients who have previously been immune partial responders or non-responders. We also are interested in knowing if this agent improves immune response by affecting cluster of differentiation 4 (CD4) + T cell death (apoptosis) or by further inhibiting (preventing) ongoing, low-level, viral replication to levels below detection by current viral load measurements. This will help us understand why immune responses to effective antiretroviral therapy are so different and help determine some possible guidelines for managing patients with poor immune responses.

Hypothesis: Patients with poor immune responses to HAART who receive Kaletra in place of their current PI or Non-Nucleoside Reverse Transcriptase Inhibitors (NNRTIs) while continuing their current 2 NRTI backbone will have improved immune response to therapy compared to patients who continue their current regimen.

Full description

To our knowledge our study is the first study showing persistent apoptosis in a subgroup of patients with complete viral suppression in association with poor immune recovery. Immune alterations independent of active viral replication may be responsible. Recent data suggests that immune responses to antiretroviral therapy depend on residual or restored thymic function. Improved CD4+ counts in patients despite virologic treatment failure are associated with greater thymic function, while poor T cell responses despite suppression of HIV are seen with decreased thymic function. Discordant immune responses may also be due to differential effects of particular antiretroviral agents on T cell apoptosis independent of viral suppression. For example, protease inhibitors have been shown to decrease rates of apoptosis of uninfected T cells. Viral replication is never completely suppressed with HAART, even when patients have undetectable plasma HIV RNA. Therefore, varying degrees of low level viral replication or replication in certain cellular compartments may continue to drive T cell apoptosis. Finally, our data suggests that ex vivo rates of Peripheral blood mononuclear cell (PBMC) apoptosis could potentially be used predict immune recovery or identify subgroups of patients who may benefit most from changes in HAART or adjunctive immunomodulatory therapies.

At this time, although there are excellent guidelines for how to evaluate and change therapy for patients with virologic failure, there are no recommendation and little data on approaches or strategies to change therapy for patients with poor immune responses. Kaletra (lopinavir/ritonavir) may be of benefit to patients with poor immune responses to HAART despite viral suppression. Kaletra may have greater potency and better suppression of viral replication that is below the level of detection by plasma polymerase chain reaction (PCR) for HIV-1 RNA. Kaletra also has an excellent pharmacokinetic profile which may result in superior inhibition of T cell apoptosis in vivo.

Enrollment

20 patients

Sex

All

Ages

18 to 75 years old

Volunteers

No Healthy Volunteers

Inclusion criteria

  • HIV Infection documented CD4+ count within the last 30 days (or drawn with screening labs)
  • Currently on a stable 3-drug HAART regimen including 2 NRTIs for > 6 month viral load (VL) < 50/mm3 for > 6 months, last within the last 30 days (or drawn with screening labs)
  • Partial immune responder or immune non-responder
  • Age > 18 years
  • Labs (drawn at screening)
  • Alanine transaminase (ALT) < 5 X the upper limit of normal (ULN)
  • Total bili < 2 X ULN
  • Creatinine < 2.0 mg/dL

Exclusion criteria

  • Prior therapy with Kaletra
  • Known hypersensitivity to Ritonavir
  • Therapy the drugs with potential serious drug interactions: flecainide, propafenone, astemizole, terfenadine, rifampin, dihydroergotamine, ergonovine, ergotamine, methylergonovine, cisapride, pimozide, lovastatin, simvastatin, midazolam, triazolam, and St. John's wart.
  • Pregnancy; breast feeding
  • Current malignancy requiring CT
  • Use of systemic corticosteroids, immunosuppressive, or cytotoxic agents within the last 45 days
  • Fever and/or evidence of an active infectious complication
  • Currently in another interventional clinical trial
  • Receiving Interleukin-2 (IL-2) or any other cytokine or growth factor
  • Enrollment in another interventional clinical trial

Trial design

Primary purpose

Treatment

Allocation

Randomized

Interventional model

Parallel Assignment

Masking

Single Blind

20 participants in 2 patient groups

Kaletra + Current Dual NRTI Backbone
Experimental group
Description:
Patients in this arm received Kaletra in addition to their current Dual NRTI Backbone.
Treatment:
Drug: Kaletra + Current Dual NRTI Backbone
Current Regimen
Active Comparator group
Description:
Patients in this study arm continued their current regimen.
Treatment:
Drug: Current Regimen

Trial contacts and locations

1

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Data sourced from clinicaltrials.gov

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