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A Study of the Effects of Inhibiting Platelet Function on Circulating Cancer Cells in Breast Cancer Patients

This study has been terminated.
(Stopped due to low percentage of patients with detectable CTCs at baseline.)
Sponsor:
Collaborator:
Barnes-Jewish Hospital
Information provided by (Responsible Party):
Washington University School of Medicine
ClinicalTrials.gov Identifier:
NCT00263211
First received: December 6, 2005
Last updated: January 24, 2017
Last verified: January 2017

December 6, 2005
January 24, 2017
January 2006
September 2009   (Final data collection date for primary outcome measure)
  • Platelet Inhibition of Circulating Tumor Cells (CTCs) Measured by the Number of Patients With Detectable CTCs [ Time Frame: Week 4 ]
    Measured by number of patients who have detectable circulating tumor cells
  • Safety and Tolerability of Aspirin and Plavix Measured by the Number of Patients Who Discontinue the Study Drug [ Time Frame: Maximum of 6 months ]
    Measured by number of patients who discontinue administration of study drug because of toxicity and the incidence categorized by type.
Not Provided
Complete list of historical versions of study NCT00263211 on ClinicalTrials.gov Archive Site
  • Percentage of Patients With a Given Absolute Number of Circulating Tumor Cells (Broken Into Categories) Plotted Against Time [ Time Frame: Baseline, 2 weeks and 1 month ]
    Percent of patients with a given number/range of CTCs ( 0, 1-5 >+ 5) vs. time baseline 2-weeks and 1 month for plavix & Aspirin arm and observation only
  • Mean Aspirin-Mediated Platelet Inhibition vs. Time Plotted for Plavix and Aspirin and Observation Groups [ Time Frame: Baseline, 2 weeks and 1 month ]
    Mean platelet inhibition vs. time plotted for Plavix & Aspirin Arm and Observation group. Citrated whole blood is added to a test carriage containing fibrinogen-coated beads and a platelet activator (arachidonic acid to synthesize thromboxane A2). Using a turbidimetric-based optical detection system, aggregation of activated platelets to fibrinogen-coated beads increase light transmittance which is reported in Aspirin Reaction Units (ARU).
  • Clopidogrel-Mediated Percent of Platelet Inhibition vs. Time Plotted for Aspirin and Plavix and Observation Groups [ Time Frame: Baseline, 2 weeks and 1 month ]
    Mean Clopidogrel-Mediated platelet inhibition (% inhibition) vs. time for Aspirin and Plavix and Observation groups
  • Progression Free Survival [ Time Frame: Maximum of 6 months ]
Not Provided
Not Provided
Not Provided
 
A Study of the Effects of Inhibiting Platelet Function on Circulating Cancer Cells in Breast Cancer Patients
The Impact Of Platelet Function Inhibition On Circulating Cancer Cells In Metastatic Breast Cancer Patients
The purpose of this study is to determine the effects of Plavix and aspirin in women with metastatic breast cancer.
Not Provided
Interventional
Phase 2
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Participant
Primary Purpose: Treatment
Breast Neoplasms
  • Drug: Plavix
    Other Name: Clopidogrel Bisulfate
  • Drug: Aspirin
    Other Name: acetylsalicylic acid
  • Experimental: Plavix and Aspirin
    Patients will receive a 300 mg loading dose of Plavix on day 1, followed by 75 mg/day, and aspirin 81 mg per day starting day 1. Treatment will be continued until the treating physician elects to resume systemic therapy for the treatment of breast cancer or until unacceptable toxicity is observed. A pill diary will be collected monthly to monitor patients' compliance with the medication regimen.
    Interventions:
    • Drug: Plavix
    • Drug: Aspirin
  • No Intervention: Observation only
    Observation by treating physician
Not Provided

*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
 
Terminated
48
September 2009
September 2009   (Final data collection date for primary outcome measure)

Inclusion Criteria:

  • Women with metastatic breast cancer who are completing planned course of chemotherapy with planned treatment break
  • On stable hormone therapy for at least 2 months are also eligible for the study
  • Estimated survival of at least 3 months
  • No platelet inhibitor therapy within 1 month of study entry
  • Platelets ≥ 100,000
  • Coagulation screening tests within normal range (INR between 0.81 and 1.20)
  • Normal kidney and liver function as defined by:

    • Aspartate aminotransferase(AST)/serum glutamic oxaloacetic transaminase (SGOT))/alanine aminotransferase(ALT) ≤ 2 x Institutional Normal
    • Creatinine ≤ 2 x Institutional Normal
  • Able to provide signed, informed consent.

Exclusion Criteria:

  • Patients going on to surgery
  • Patients with a serious bleeding disorder that make them inappropriate candidates for NSAID therapy
  • Patients with history of significant bleeding related to peptic ulcer disease
  • Patients on standing doses of NSAIDS or platelet function inhibitors
  • Patients on standing doses of anti-coagulants
Sexes Eligible for Study: Female
18 Years and older   (Adult, Senior)
No
Contact information is only displayed when the study is recruiting subjects
United States
 
 
NCT00263211
05-0427 / 201107340
No
Not Provided
Not Provided
Not Provided
Washington University School of Medicine
Washington University School of Medicine
Barnes-Jewish Hospital
Principal Investigator: Katherine N Weilbaecher, M.D. Washington University School of Medicine
Washington University School of Medicine
January 2017

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP