Clinical Trials


Effect of Vicriviroc on HIV Ribonucleic Acid (RNA) Levels in Cerebrospinal Fluid (Study P05241)

This study has been completed
Merck Sharp & Dohme Corp.

Information provided by (Responsible Party)
Merck Sharp & Dohme Corp. Identifier

First received: January 24, 2008
Last updated: February 20, 2015
Last Verified: February 2015
History of Changes


Vicriviroc (vye-kri-VYE-rock) is an investigational drug (not yet approved by Government Regulatory Authorities for commercial use) that belongs to a new class of drugs, called CCR5 receptor blockers. This group of drugs blocks one of the ways HIV enters T-cells (the cells that fight infection). Previous studies in HIV treatment-experienced patients have shown that vicriviroc is safe and effective. The purpose of this study is to determine the effect of vicriviroc on HIV RNA levels in cerebrospinal fluid (CSF).

Condition Intervention Phase
HIV Infections

Drug : Vicriviroc
Phase 1

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Effect of Vicriviroc on HIV RNA Levels in Cerebrospinal Fluid

Further study details as provided by Merck Sharp & Dohme Corp.:

Primary Outcome Measures

  • Change in HIV RNA levels in CSF [ Time Frame: Pretreatment and Week 2 visits ]
Secondary Outcome Measures:
  • Proportion of subjects achieving CSF HIV RNA <50 copies/mL [ Time Frame: Week 2 ]

Enrollment: 13
Study Start Date: March 2008
Study Completion Date: March 2010
Primary Completion Date: July 2009 (Final data collection date for primary outcome measure)

Arms Assigned Interventions
Experimental: VCV + Failing HAART
Vicriviroc plus failing highly-active antiretroviral therapy
Drug: Vicriviroc

One tablet of vicriviroc maleate 30 mg once daily for 24 weeks (added to the subject's failing antiretroviral background regimen for 2 weeks, and then administered with optimized background therapy).

Other Name: Vicriviroc maleate, SCH-D, SCH 417690, VCV

Detailed Description:

This is a nonrandomized, open-label, multicenter study to investigate the HIV antiviral response in CSF when vicriviroc is added for 2 weeks to the subject's failing antiretroviral background regimen. The primary efficacy endpoint of this study is the mean change in log10 CSF HIV RNA from baseline at Week 2. The secondary efficacy endpoint is the proportion of subjects achieving CSF HIV RNA <50 copies/mL at Week 2. At Week 2, the subject's background regimen will be optimized and vicriviroc continued up to Week 24. After completing Week 24 of the study, subjects will be offered the option to continue on open-label VCV 30 mg once daily, if appropriate, until commercially available or until the sponsor terminates the clinical development of VCV. Subjects who discontinue vicriviroc for any reason will be requested to participate in long-term follow up.



Ages Eligible for Study: 18 Years and older  
Sexes Eligible for Study: All  
Accepts Healthy Volunteers: No  


Inclusion Criteria:

  • A subject must be at least 18 years of age at the time of study entry, of either sex, and of any race.
  • A subject must be infected with HIV-1 virus, as documented by a positive assay for HIV-1 RNA in plasma, prior to Screening.
  • A subject's HIV isolate must be solely CCR5-tropic at Screening (ie, a subject must not have detectable CXCR4-tropic or dual/mixed CCR5/CXCR4-tropic HIV isolates).
  • Subjects must be failing their current antiretroviral regimen with plasma HIV RNA >=1000 copies/mL at the time of screening. (Note: The failing background regimen must contain a ritonavir-boosted PI, and may not include an NNRTI.)
  • A subject must be willing to undergo study procedures including lumbar punctures, and to adhere to the chosen antiretroviral regimen.
  • A subject must have a pretreatment CSF HIV RNA of >=200 copies/mL.

Exclusion Criteria:
  • A subject must not be taking medication for seizure control or have any condition that, in the judgment of the investigator, is likely to increase the risk of seizures.
  • A subject must not have a prior history of malignancy (with the exception of surgically resected basal cell carcinoma with clear margins or Kaposi's sarcoma without visceral or mucosal involvement that resolved without systemic anticancer treatment).
  • A subject must not have a contraindication to lumbar puncture (eg, bleeding diathesis
or use of anticoagulants).

contacts and locations

Contacts and Locations

Choosing to participate in a study is an important personal decision.Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below.For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00632073

Sponsors and Collaborators

Merck Sharp & Dohme Corp.
More Information

More Information

Responsible Party: Merck Sharp & Dohme Corp. Identifier: NCT00632073   History of Changes  
Other Study ID Numbers: P05241  
Study First Received: January 24, 2008  
Last Updated: February 20, 2015  

Keywords provided by Merck Sharp & Dohme Corp.:

HIV Infections
Acquired Immunodeficiency Syndrome
treatment experienced

Additional relevant MeSH terms:
HIV Infections
Maleic acid processed this data on September 21, 2018
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