The Switch Study: The Role of Lamivudine/Emtricitabine (3TC/FTC) in Antiretroviral Regimens

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00152061
Recruitment Status : Completed
First Posted : September 9, 2005
Last Update Posted : June 19, 2013
Santa Clara Valley Health & Hospital System
University of California, Davis
Information provided by (Responsible Party):
Stanford University

Brief Summary:
In this study the researchers will be enrolling patients who are failing their current antiretroviral regimen who also have resistance to 3TC or FTC. Patients will have their current antiretroviral regimen changed based on resistance testing and also be randomly assigned to either include, or not include 3TC/FTC in this new regimen. The purpose of the research is to investigate whether the change in therapy results in a decrease in the amount of virus particles and an increase in the CD4 cell count. In addition the researchers are investigating the relationship between the existence of resistance and the rate of decrease in viral load, and also to determine if continuing 3TC/FTC (despite being resistant to the medications) has any effect on the rate of decrease of viral load, or effect on CD4 counts.

Condition or disease Intervention/treatment Phase
HIV Infections Drug: 3TC and FTC Not Applicable

Detailed Description:
In this randomized, open-label, controlled trial, HIV-infected patients who are failing 3TC/FTC-containing highly active antiretroviral therapy, (HAART), will be offered individual treatment selection based on best clinical judgment and genotypic HIV-RNA resistance analysis. Patients who meet entry criteria will first be randomized to either continue or discontinue 3TC/FTC while they remain on their current therapy. HIV-1 viral load will be measured 4 times over a period of 14 days to determine the virologic response to this change. At day 14, each patient's regimen will be optimized to a new combination based on a genotype test taken at study entry. Patients will then start on the new salvage regimen, including or not including 3TC/FTC based on their initial randomization. Additional HIV-1 viral load measurements will be obtained to determine the virologic response to the new salvage regimen over 24 weeks.

Study Type : Interventional  (Clinical Trial)
Enrollment : 40 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: The Role of 3TC/FTC in Partially Suppressive Antiretroviral Regimens: The Switch Study
Study Start Date : January 2005
Actual Study Completion Date : August 2005

Resource links provided by the National Library of Medicine

MedlinePlus related topics: HIV/AIDS
Drug Information available for: Lamivudine

Primary Outcome Measures :
  1. To evaluate the role of lamivudine, (3TC), and emtricitabine, (FTC), in salvage regimens in patients with prior 3TC/FTC use, documented resistance to 3TC/FTC, and ongoing viremia as assessed by:
  2. Impact on the initial rate of change in HIV-1 viral load after removing 3TC/FTC from the failing regimen, and
  3. Overall change from baseline in HIV-1 viral load at 24 weeks (HIV-VL AUC 24 wks).

Secondary Outcome Measures :
  1. To evaluate the impact of continued versus discontinued 3TC/FTC on the prevalence, frequency and dynamics of the M184V/I amino acid substitution over 24 weeks.
  2. To determine the proportion of patients failing and/or not responding to therapy after 24 weeks as defined by failure to achieve HIV-1 viral load less than 400 copies/ml and/or less than 50 copies/ml
  3. To assess the changes from baseline in absolute CD4 (and CD8) cell counts at 24 weeks.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • HIV-1 seropositive patients >= 18 years of age
  • Willingness and ability to understand and sign a written informed consent and comply with the protocol procedure
  • Prior treatment with nucleoside reverse transcriptase inhibitors (NRTI's), non-nucleoside reverse transcriptase inhibitors (NNRTI's) and protease inhibitor (PI)-containing regimens
  • On a stable PI and 3TC or FTC -containing regimen for >= 2 months
  • Plasma HIV-1 RNA >5000 copies/ml
  • CD4 >100
  • Documented M184V or I on genotype within 3 months of study entry
  • At least 3 PI-associated resistance mutations on genotype within 3 months of study entry, (including known resistance mutations at codons 10, 30, 46, 50, 54, 71, 82, 84, and 90)

Exclusion Criteria:

  • In the opinion of the investigator a patient that is either unwilling or unable to be adherent to antiretroviral drugs
  • Requirement for concomitant treatment with medicines that interfere with the therapy prescribed in the study
  • Patients who have never taken 3TC or FTC, or with no prior documentation of the M184V mutation
  • Active hepatitis B infection
  • Vaccination within 2 weeks of entering the study
  • An acute opportunistic illness within 4 weeks of entering the study; chronic infections will not be excluded
  • Use of immunomodulatory medications such as IL-2
  • Planned use of enfuvirtide, (T20) in salvage regimen, (in T20 naïve subjects)

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00152061

United States, California
Santa Clara Medical Center, PACE Clinic
San Jose, California, United States, 95128
Sponsors and Collaborators
Stanford University
Santa Clara Valley Health & Hospital System
University of California, Davis
Principal Investigator: Andrew Zolopa, MD Stanford University

Responsible Party: Stanford University Identifier: NCT00152061     History of Changes
Other Study ID Numbers: 74009
IRB protocol 74009
SPO number 25036
First Posted: September 9, 2005    Key Record Dates
Last Update Posted: June 19, 2013
Last Verified: June 2013

Keywords provided by Stanford University:
Antiretroviral Drug Resistance
Treatment Experienced

Additional relevant MeSH terms:
HIV Infections
Lentivirus Infections
Retroviridae Infections
RNA Virus Infections
Virus Diseases
Sexually Transmitted Diseases, Viral
Sexually Transmitted Diseases
Immunologic Deficiency Syndromes
Immune System Diseases