Stopping and Restarting Anti-HIV Drugs in Children and Adolescents With Low Blood Levels of HIV
- Conditions
- HIV Infections
- Registration Number
- NCT00016783
- Brief Summary
Some patients taking anti-HIV drugs as part of highly active antiretroviral therapy (HAART) do not show any HIV in the blood; however, some HIV will remain hidden in the body and, if the drugs are stopped, will return to the blood. The purpose of this study is to determine if short periods of stopping HAART increase the activity of CD8 and CD4 cells (cells of the immune system that fight infection), if repeated stopping of these drugs for longer periods of time and restarting them will increase effectiveness of HAART, and if the increased immune system activity as a result of stopping treatment leads to lower levels of HIV over time.
- Detailed Description
Some HIV infected patients taking HAART have been able to achieve prolonged suppression of HIV viral load for extended periods of time. However, discontinuing HAART has consistently resulted in HIV's return to plasma. Both CD8 and CD4 cells are markedly reduced in individuals with prolonged HIV suppression; control of and response to cell-associated HIV is dependent on immune-mediated mechanisms involving these cells. It is hypothesized that a brief and low-level increase in HIV levels resulting from HAART interruption might boost HIV-specific CD8 and CD4 T-cell counts. After suppression of viral load with the reintroduction of HAART, the expanded CD8 population might be able to better control viral replication and better respond to cell-associated HIV. Future treatment interruption may lead to longer periods of undetectable viral loads.
Patients are divided into 2 age cohorts, with Cohort 1 consisting of children and adolescents 4 years and older up to 21 years of age, and Cohort 2 consisting of children and adolescents 2 years and older up to 4 years of age. Patients will be assigned to one of 2 groups. Group A patients will participate in drug holiday cycles from HAART and then back to HAART; Group B is a control group that remains on continuous HAART throughout the study. Cycle 1 for Group A patients begins with 18 days of HAART and a 3-day drug holiday. At the end of the drug holiday, viral load is measured and HAART is resumed for 28 days (detectable virus cycle) if viral load is detectable after the drug holiday. If viral load remains below the level of detection, the patient begins the next drug holiday cycle. With each subsequent drug holiday cycle, time off HAART will increase by 2 days. Patients failing 4 repeated detectable virus (28-day treatment) cycles will be taken off study.
Patients will be enrolled in this study for a minimum of 142 weeks. For Group A, HIV viral load and CD4 cell count are measured at the end of each drug holiday and each HAART resumption; HIV-specific CD4 and CD8 responses are measured every 3 cycles; and cell-associated HIV is assessed at entry, at 12-week intervals, and at the end of the study. For Group B, physical exams are conducted and HIV viral load and other blood work are measured every 12 weeks.
Recruitment & Eligibility
- Status
- COMPLETED
- Sex
- All
- Target Recruitment
- 39
- HIV infected
- For Cohort 1, CD4 T-cell percent greater than 20
- For Cohort 2, CD4 T-cell percent greater than 25
- Viral load less than 400 copies/ml in the year prior to study entry and less than 50 copies/ml at screening
- Taking anti-HIV drugs (including at least 1 protease inhibitor) and have been on anti-HIV drugs for at least 1 year prior to study entry
- Have been on their current drug regimen for at least 4 months
- Willing to follow study procedures
- Parental or guardian consent if under 18 years old
- Acceptable forms of contraception
- Taking abacavir, nevirapine, efavirenz, or delavirdine
- AIDS-related or other infections needing drug treatment at study entry
- Pregnant or breastfeeding
- Have, or have had in the past, diseases (other than HIV infection) or other conditions that, in the doctor's opinion, would interfere with the study
- Taking experimental drugs without the consent of the protocol team
Study & Design
- Study Type
- OBSERVATIONAL
- Study Design
- Not specified
- Primary Outcome Measures
Name Time Method
- Secondary Outcome Measures
Name Time Method
Trial Locations
- Locations (17)
Chicago Children's Memorial Hosp
🇺🇸Chicago, Illinois, United States
State Univ of New York at Stony Brook
🇺🇸Stony Brook, New York, United States
SUNY Health Sciences Ctr at Syracuse / Pediatrics
🇺🇸Syracuse, New York, United States
Texas Children's Hosp / Baylor Univ
🇺🇸Houston, Texas, United States
Los Angeles County - USC Med Ctr
🇺🇸Los Angeles, California, United States
Univ of Medicine & Dentistry of New Jersey / Univ Hosp
🇺🇸Newark, New Jersey, United States
St. Lukes/Roosevelt Hosp Ctr
🇺🇸New York, New York, United States
Univ of Miami (Pediatric)
🇺🇸Miami, Florida, United States
Johns Hopkins Hosp - Pediatric
🇺🇸Baltimore, Maryland, United States
Children's Hosp of Boston
🇺🇸Boston, Massachusetts, United States
Columbia Presbyterian Med Ctr
🇺🇸New York, New York, United States
San Juan City Hosp
🇵🇷San Juan, Puerto Rico
Harlem Hosp Ctr
🇺🇸New York, New York, United States
University of Rochester Medical Center
🇺🇸Rochester, New York, United States
Children's Hosp of Denver
🇺🇸Denver, Colorado, United States
Howard Univ Hosp
🇺🇸Washington, District of Columbia, United States
Bronx Lebanon Hosp Ctr
🇺🇸Bronx, New York, United States