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Ocsaar and CYP2C9 Ploymorphism, Is There a Connection Between Pharmacokinetics, Pharmacodynamics and Pharmacogenetics?

The recruitment status of this study is unknown because the information has not been verified recently.
Verified August 2008 by Assaf-Harofeh Medical Center.
Recruitment status was  Not yet recruiting
Sponsor:
Information provided by:
Assaf-Harofeh Medical Center
ClinicalTrials.gov Identifier:
NCT00732966
First received: August 10, 2008
Last updated: August 11, 2008
Last verified: August 2008
History of Changes
  Purpose

Most Angiotensin receptor blocker's (ARBs) are metabolized by cytochrome P4502C9 (CYP2C9), one of the major isoforms of the cytochrome P450 in human liver microsome. The purpose of this study is to evaluate whether CYP2C9 polymorphism has a significant clinical influence on the blood pressure lowering effect of losartan and valsartan. Weather there is a genetic importance in choosing the right ARB for the right patient.


Condition Intervention
Hypertension
 Drug: losartan
Drug: valsartan

Study Type: Interventional
Study Design: Endpoint Classification: Pharmacokinetics/Dynamics Study
Intervention Model: Single Group Assignment
Masking: Open Label
Official Title: Ocsaar and CYP2C9 Ploymorphism, Is There a Connection Between Pharmacokinetics, Pharmacodynamics and Pharmacogenetics?

Resource links provided by NLM:

U.S. FDA Resources

Further study details as provided by Assaf-Harofeh Medical Center:

Primary Outcome Measures:
  • Blood pressure lowering effect of losartan and valsartan in patients with different CYP2C9 allels [ Time Frame: one month ] [ Designated as safety issue: No ]

Secondary Outcome Measures:
  • losartan/E-3174 ratio in different allelic groups of CYP2C9 [ Time Frame: one month ] [ Designated as safety issue: No ]

Estimated Enrollment: 30
Study Start Date: September 2008
Estimated Primary Completion Date: September 2009 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Experimental: 1
Hypertensive patients will be treated with losartan for one months
 Drug: losartan
with losartan 50 mg once daily for one month
Drug: valsartan
valsartan 160 mg once daily
Experimental: 2
Hypertensive patients will be treated with valsartan
 Drug: losartan
with losartan 50 mg once daily for one month
Drug: valsartan
valsartan 160 mg once daily

  Show Detailed Description

  Eligibility

Ages Eligible for Study:   18 Years and older
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No
Criteria

Inclusion Criteria:

  • The study will include 30 patients with the 3 most prevalent alleles of CYP2C9 *1, *2 and*3, 10 patients of each group.

Exclusion Criteria:

  • Patients treated with losartan or valsartan prior to their enrollment to the study,
  • Patients with BP below 140 systolic or 90 diastolic in an ambulatory 24 hours BP monitoring, acute coronary syndrome during the 6 months previous to the study,
  • Renal failure with creatinin levels above 1.5 mg/dL, hyperkalemia (K > 5 mg/dL),
  • Hematologic or solid malignancies or pregnancy.

  • Patients will also be excluded from the study if they are known to use one of the drugs inducing or inhibiting the CYP2C9, such as

    • rifampicin carbamazepine,
    • ethanol,
    • phenobarbitone,
    • fluconazole,
    • amiodarone,
    • trimethoprim,
    • fluvastatin,
    • cimetidine
    • chloramphenicol.
  Contacts and Locations
Please refer to this study by its ClinicalTrials.gov identifier: NCT00732966

Contacts
Contact: Ronit Koren Peleg, MD 972-524-535024 ronitkoren@gmail.com
Contact: Ahuva Golik, Prof 972-577-345242 golik@asaf.health.gov.il

Sponsors and Collaborators
Assaf-Harofeh Medical Center
Investigators
Principal Investigator: Ronit Koren Peleg, MD Department of Internal Medicine A , Research & Development unit Assaf Harofeh Medical Center, Zerifin, affiliated to Sackler School of Medicine, Tel Aviv, Israel
  More Information

No publications provided

Responsible Party: Koren Peleg Ronit MD, Assaf-Harofeh Medical Center internal medicine A
ClinicalTrials.gov Identifier: NCT00732966     History of Changes
Other Study ID Numbers: ronit3
Study First Received: August 10, 2008
Last Updated: August 11, 2008
Health Authority: Israel: Israeli Health Ministry Pharmaceutical Administration

Keywords provided by Assaf-Harofeh Medical Center:
cyp2c9
losartan
pharmacogenetics
pharmacokinetics
pharmacodynamics

Additional relevant MeSH terms:
Hypertension
Vascular Diseases
Cardiovascular Diseases
Losartan
Valsartan
Anti-Arrhythmia Agents
Cardiovascular Agents
 Therapeutic Uses
Pharmacologic Actions
Antihypertensive Agents
Angiotensin II Type 1 Receptor Blockers
Angiotensin Receptor Antagonists
Molecular Mechanisms of Pharmacological Action

ClinicalTrials.gov processed this record on May 23, 2013