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Once-Daily Drug Regimen for HIV-Infected Patients

A Pilot Study of Once-Daily Therapy With Amprenavir, Ritonavir, Lamivudine and Abacavir in HIV-Infected, Antiretroviral-Naive Patients

This study will examine the safety of giving antiviral therapy for HIV infection in a once-daily dosing schedule, and assess how well patients tolerate this regimen. A once a day dosing schedule may be easier for some people to follow than one that requires taking medicine 2 or 3 times a day. The ease of treatment is important, because not following the prescribed dosing regimen may make therapy less effective or ineffective.

HIV-infected patients 18 years and older who have never been treated for their infection may be eligible for this study. Candidates will be screened with a history and physical examination, including blood tests. Participants will take the following medications once a day: 1200 mg of amprenavir (8 capsules); 300 mg of ritonavir (3 capsules); 600 mg of abacavir (2 pills); and 300 mg of lamivudine (2 pills). Patients will have routine blood tests and be seen by a nurse or doctor, or both, at follow-up visits at weeks 2, 4, 8, 12, and 16; then every 8 weeks until week 48; and then every 3 months for up to 3 years. At week 2, a special blood test will be done over the course of a day to measure blood drug levels. For this test, blood samples will be drawn 8 times over a 24-hour period. A heparin lock (a device that allows the needle to remain in the vein) will be used to avoid multiple needle sticks.

Aperçu de l'étude

Description détaillée

The development of a once-daily anti-retroviral regimen is a priority because regimen simplicity might enhance regimen adherence, and because a once-daily regimen would be useful for directly observed therapy. Pharmacokinetic modeling suggests that plasma levels of amprenavir in the presence of ritonavir, a potent inhibitor of cytochrome p450, should be high enough to support once-daily dosing. Lamivudine is currently being explored in other studies in once-daily dosing. Abacavir has not been used once daily but some in vitro studies suggest that such dosing might be appropriate. In this uncontrolled, open-label study, amprenavir 1200 mg daily, ritonavir 300 mg daily, lamivudine 300 mg daily, and abacavir 600 mg daily will be administered to up to 25 HIV-infected, anti-retroviral naive patients. The objectives are to assess the tolerability and safety of this regimen; the plasma concentrations of amprenavir; and the anti-viral response. Study evaluations include percentage of patients who have discontinued the regimen by weeks 16 and 24 for toxicity, intolerance or failure; the number of grade 3 and 4 adverse events by weeks 16 and 24; the antiviral response at weeks 16, 24, and 48 (change from baseline and percentage of patients with viral load less than 50 copies and less than 400 copies per mL), and the number (percent) of patients with trough plasma concentrations of amprenavir above 280 ng/mL.

Type d'étude

Interventionnel

Inscription

25

Phase

  • La phase 1

Contacts et emplacements

Cette section fournit les coordonnées de ceux qui mènent l'étude et des informations sur le lieu où cette étude est menée.

Lieux d'étude

    • Maryland
      • Bethesda, Maryland, États-Unis, 20892
        • National Institute of Allergy and Infectious Diseases (NIAID)

Critères de participation

Les chercheurs recherchent des personnes qui correspondent à une certaine description, appelée critères d'éligibilité. Certains exemples de ces critères sont l'état de santé général d'une personne ou des traitements antérieurs.

Critère d'éligibilité

Âges éligibles pour étudier

  • Enfant
  • Adulte
  • Adulte plus âgé

Accepte les volontaires sains

Non

Sexes éligibles pour l'étude

Tout

La description

Adults (greater than 18 years) infected with HIV-1.

Plasma viral burden greater than 8,000 and less than 60,000 RNA copies per ml. by bDNA method at screening.

CD4 cell count above 200 cells per microliter at screen.

No prior treatment with any anti-retroviral agent.

Laboratory values at screen: hemoglobin greater than 9 g per dl; granulocyte count greater than 900 cells per microliter; platelet count greater than 80,000 cells per microliter; AST (SGOT) less than 151 U/L; creatinine less than 2 mg/dL.

Must not be pregnant or breast-feeding and willing to avoid pregnancy by the use of non-hormonal methods of birth control during study participation. Pregnancy test (blood or urine) must be negative within two weeks prior to dosing with study medications.

Willing and able to provide written informed consent.

No history suggestive of malabsorption.

No chronic diarrhea.

Must not have had treatment with systemic corticosteroids at greater than physiologic replacement doses, interleukins, interferons, radiation therapy or cytotoxic chemotherapeutic agents within 30 days of study drug administration or an anticipated need for radiation or chemotherapy treatment within the next 48 weeks (with the exception of local treatment of Kaposi's sarcoma).

Must not have current or anticipated therapy with other agents with documented activity against HIV-1 in vitro.

Must not have active, untreated opportunistic infection or other major illness that would, in the opinion of the investigator, increase the risk that adverse events might pose to the patient or might render the patient too ill to return for study visits.

Must not have significant substance abuse or psychiatric illness that might interfere with assessment or compliance.

Must not have current or anticipated future need for any of the following drugs which are contraindicated with an amprenavir-ritonavir regimen because of drug-drug interactions: Terfenadine (Seldane), Astemizole (Hismanal), Cisapride (Propulsid), Triazolam (Halcion), Bepridil (Vascor), Medazolam (Versed), Rifampin (Rifadin, Rifamate, Rifater), Ergotamine/Dihydroergotamine containing regimens (Ergomar, Wygraine, Ercaf, DHE, Migranal), Amiodarone (Cordarone), Flecanaide (Tambocor), Propafenone (Rythmol), Quinidine (Quinaglute, Cardioquin), and Pimozide (Orap).

Must not have current or anticipated future need for the following anticonvulsants: phenobarbital, phenytoin, carbamazepine.

Plan d'étude

Cette section fournit des détails sur le plan d'étude, y compris la façon dont l'étude est conçue et ce que l'étude mesure.

Comment l'étude est-elle conçue ?

Détails de conception

  • Objectif principal: Traitement

Collaborateurs et enquêteurs

C'est ici que vous trouverez les personnes et les organisations impliquées dans cette étude.

Publications et liens utiles

La personne responsable de la saisie des informations sur l'étude fournit volontairement ces publications. Il peut s'agir de tout ce qui concerne l'étude.

Dates d'enregistrement des études

Ces dates suivent la progression des dossiers d'étude et des soumissions de résultats sommaires à ClinicalTrials.gov. Les dossiers d'étude et les résultats rapportés sont examinés par la Bibliothèque nationale de médecine (NLM) pour s'assurer qu'ils répondent à des normes de contrôle de qualité spécifiques avant d'être publiés sur le site Web public.

Dates principales de l'étude

Début de l'étude

1 janvier 2000

Achèvement de l'étude

1 novembre 2000

Dates d'inscription aux études

Première soumission

18 janvier 2000

Première soumission répondant aux critères de contrôle qualité

9 décembre 2002

Première publication (Estimation)

10 décembre 2002

Mises à jour des dossiers d'étude

Dernière mise à jour publiée (Estimation)

4 mars 2008

Dernière mise à jour soumise répondant aux critères de contrôle qualité

3 mars 2008

Dernière vérification

1 décembre 1999

Plus d'information

Ces informations ont été extraites directement du site Web clinicaltrials.gov sans aucune modification. Si vous avez des demandes de modification, de suppression ou de mise à jour des détails de votre étude, veuillez contacter register@clinicaltrials.gov. Dès qu'un changement est mis en œuvre sur clinicaltrials.gov, il sera également mis à jour automatiquement sur notre site Web .

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