TBTC Study 24: Intermittent Treatment of TB With Isoniazid Resistance or Intolerance

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: NCT00023374
Recruitment Status : Completed
First Posted : September 10, 2001
Last Update Posted : August 3, 2011
VA Office of Research and Development
Information provided by:
Centers for Disease Control and Prevention

Brief Summary:
This study is a prospective, open-label, nonrandomized trial using a largely-intermittent, six-month tuberculosis treatment regimen among patients who will not receive isoniazid due to the presence of initial isoniazid resistance or intolerance. Subjects are enrolled after resistance or intolerance to isoniazid has been documented, and are treated for a total of six months (nine months if baseline chest x-ray shows cavitation and 2-month sputum culture is positive) with twice weekly or thrice weekly rifampin, ethambutol, and pyrazinamide.

Condition or disease Intervention/treatment Phase
Tuberculosis Drug: Rifampin Drug: Pyrazinamide Drug: Ethambutol Drug: REZ Not Applicable

Detailed Description:

Primary Objective:

To evaluate the efficacy of a directly-observed, largely-intermittent, six-month regimen of rifampin, pyrazinamide, ethambutol among patients with culture confirmed isoniazid-resistant M. tuberculosis.

Secondary Objectives:

To describe the rate, severity and timing of toxicities and drug intolerances associated with this treatment regimen.

To describe the utility of this regimen among patients who are unable to continue the standard 4-drug regimen due to the development of intolerance to isoniazid

Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 98 participants
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: TBTC Study 24: A Non-Comparative Study of the Efficacy of a Largely-Intermittent, Six-Month Tuberculosis Treatment Regimen Among Patients Who Will Not Receive Isoniazid Due to Initial Isoniazid Resistance or Intolerance
Study Start Date : August 2000
Actual Primary Completion Date : December 2006
Actual Study Completion Date : December 2010

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Tuberculosis
Drug Information available for: Isoniazid

Arm Intervention/treatment
Experimental: Rifampin+PZA+Ethambutol
6 mos of intermittent (2 or 3 times weekly) therapy with REZ
Drug: Rifampin
6mos REZ intermittent

Drug: Pyrazinamide
6mos REZ intermittent

Drug: Ethambutol
6mos REZ intermittent

Drug: REZ
Rif+PZA+EMB given 2 or 3 times weekly for 6 months

Primary Outcome Measures :
  1. Combined endpoint of bacteriologic plus clinical failure and relapse within 2 years of completing treatment among patients with isoniazid-resistant tuberculosis and among patients enrolled with intolerance to isoniazid [ Time Frame: 30 mos ]

Secondary Outcome Measures :
  1. Occurrence and timing of toxicities and drug intolerances [ Time Frame: 6 mos ]
  2. Time to completion and the frequency of successful completion [ Time Frame: 6 mos ]
  3. Occurrence of acquired resistance [ Time Frame: 30 mos ]
  4. Proportion with documented conversion of 8-week sputum cultures [ Time Frame: 8 wks ]
  5. Bacteriologic failure or relapse in patients with resistance to streptomycin [ Time Frame: 30 mos ]
  6. Bacteriologic failure or relapse among patient with history of prior treatment [ Time Frame: 30 mos ]
  7. Bacteriologic failure or relapse by duration of isoniazid received [ Time Frame: 30 mos ]
  8. Bacteriologic failure or relapse among patients with positive 8-week sputum cultures [ Time Frame: 30 mos ]

Information from the National Library of Medicine

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, Learn About Clinical Studies.

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

Inclusion criteria:

  1. Culture-confirmed pulmonary or extrapulmonary tuberculosis due to a strain of M tuberculosis sensitive to rifampin, ethambutol and pyrazinamide based upon specimens (sputum or other pulmonary or extrapulmonary disease site specimens) collected no more than 8 weeks before and no more than 2 weeks after the start of the initial therapy. Susceptibility testing results documenting susceptibility to rifampin and ethambutol must be available at the time of enrollment. Susceptibility results to pyrazinamide may be pending at enrollment as long as pyrazinamide resistance is not known to be present based on prior testing. If pyrazinamide resistance is detected and confirmed (see Study Definitions) the patient will be withdrawn from the study therapy, treatment continued as recommended by the treating physician, and follow-up continued as per the protocol.
  2. Decision to discontinue or not use isoniazid for one or both of these following conditions within the first 70 days of therapy:

    • Isoniazid resistant strain (growth in 0.2 mcg/ml or 0.1 mcg/ml of isoniazid on solid or liquid media, respectively)
    • The discontinuation of isoniazid due to intolerance (as judged by the principal investigator - see Study Definitions)
  3. For patients enrolled after the start of therapy, documentation of adequate initial regimen as recommended in the CDC/ATS Treatment Guidelines (Appendix 1) is required. There are two means by which this requirement can be met:

    • The standard 4-drug regimen of isoniazid, rifampin, pyrazinamide, and either ethambutol or streptomycin or both.
    • The same regimen with isoniazid excluded for some or all doses in patients with known isoniazid intolerance or tuberculosis due to an isoniazid-resistant strain (i.e., the 3-drug regimen of rifampin, pyrazinamide and either ethambutol or streptomycin or both)
  4. A minimum duration of daily treatment as defined by one of two methods:

    • 14 daily doses within 17 days (with at least 10 of the 14 doses directly observed)
    • 14 directly observed doses within 23 days

    Following the minimum daily phase of therapy, adequate pre-enrollment treatment is defined as directly administered therapy given daily, twice weekly, or thrice weekly using CDC/ATS guidelines. Documenting pre-enrollment therapy is accomplished by hospital medical records and/or clinic entries of DOT.

  5. Age: 18 years or older
  6. Documentation of negative test for human immunodeficiency virus (HIV) infection. Documentation means written copies of HIV laboratory test results. A negative HIV test result within the 6 months prior to enrollment is acceptable.
  7. Documentation of study baseline laboratory parameters. Baseline laboratory parameters obtained no more than 2 weeks prior to enrollment and must be within the following limits:

    1. . Amino aspartate transferase (AST) activity less than 3 times upper limit of normal;
    2. . Total bilirubin level less than 2.5 times upper limit of normal;
    3. . Creatinine level less than 2 times upper limit of normal;
    4. . Hemoglobin level of at least 7.0 g/dL;
    5. . Platelet count of at least 50,000 mm3
  8. Karnofsky score of at least 60. See Appendix 6 for Karnofsky scoring system.
  9. A negative pregnancy test within the past 14 days for women with child-bearing potential, and a willingness to practice an adequate (preferably barrier) method of birth control. In addition, women with child-bearing potential should be offered information concerning sources of contraceptive counseling and services.
  10. Informed consent signed by patient and investigator documenting the willingness to use the 3-drug, intermittent regimen is required, in accordance with state law and local IRB requirements. Patients who are unable to provide informed consent due to an inability to comprehend English may be enrolled by providing informed consent by either of two means:

    • the use of a translator to provide a verbal translation of the IRB-approved English version of the consent form; the translator will sign the English form attesting the translation and the patient will sign the IRB-approved translation of the short form
    • the use of a translated consent document, approved by the IRB, that is in the patient's native language.

Exclusion criteria

  1. Patients with known treatment-limiting reaction to rifamycins, pyrazinamide, or ethambutol.
  2. Diagnosis of silicotuberculosis or tuberculosis of the central nervous system
  3. Patients who, during initial therapy with CDC/ATS recommended therapy with isoniazid, rifampin and pyrazinamide plus either ethambutol or streptomycin or both, have received greater than 21 days of treatment with additional drugs with known antituberculosis activity - see Concomitant Medications During Study Phase Therapy.
  4. Patients with isoniazid intolerance or isoniazid-resistant tuberculosis who during pre-enrollment therapy have missed a total of two weeks of directly observed therapy doses due to non-compliance.
  5. Patients enrolled due to isoniazid intolerance who during pre-enrollment therapy have missed a total of over 4 weeks of directly observed therapy doses for management of drug intolerance.

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): NCT00023374

  Hide Study Locations
United States, Arkansas
Central Arkansas Veterans Health System
Little Rock, Arkansas, United States, 72205
United States, California
LA County/USC Medical Center
Los Angeles, California, United States, 90033
University of California, San Francisco
San Francisco, California, United States, 94110
United States, Colorado
Denver Department of Public Health and Hospitals
Denver, Colorado, United States, 80204
United States, District of Columbia
Washington, D.C. VAMC
Washington, District of Columbia, United States, 20422
United States, Illinois
Chicago VA Medical Center (Lakeside)
Chicago, Illinois, United States, 60611
Hines VA Medical Center
Hines, Illinois, United States, 60141
United States, Maryland
Johns Hopkins University School of Medicine
Baltimore, Maryland, United States, 21287-0003
United States, Massachusetts
Boston Medical Center
Boston, Massachusetts, United States, 02118
United States, New Jersey
New Jersey Medical School
Newark, New Jersey, United States, 07107-3001
United States, New York
New York University School of Medicine
New York, New York, United States, 10016
Columbia University/Presbyterian Medical Center
New York, New York, United States, 10032
Harlem Hospital Center
New York, New York, United States, 10037
United States, North Carolina
Carolinas Medical Center
Charlotte, North Carolina, United States, 28203
Duke University Medical Center
Durham, North Carolina, United States, 34222
United States, Tennessee
Nashville VA Medical Center
Nashville, Tennessee, United States, 37212-2637
United States, Texas
University of North Texas Health Science Center
Fort Worth, Texas, United States, 76107-2699
Thomas Street Clinic
Houston, Texas, United States, 77009
Audi L. Murphy VA Hospital
San Antonio, Texas, United States, 78284
United States, Washington
Seattle King County Health Department
Seattle, Washington, United States, 98104
Canada, British Columbia
University of British Columbia
Vancouver, British Columbia, Canada, Canada V5Z 4R4
Canada, Manitoba
University of Manitoba
Winnipeg, Manitoba, Canada, CANADA R3A 1R8
Canada, Quebec
Montreal Chest Institute McGill University
Montreal, Quebec, Canada, H2X 2P4Pq Canada
Sponsors and Collaborators
Centers for Disease Control and Prevention
VA Office of Research and Development
Principal Investigator: Randall Reves, MD Denver Health and Hospitals, Denver CO

Additional Information:
Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Stefan Goldberg, CDC Identifier: NCT00023374     History of Changes
Other Study ID Numbers: CDC-NCHSTP-2340
First Posted: September 10, 2001    Key Record Dates
Last Update Posted: August 3, 2011
Last Verified: June 2011

Keywords provided by Centers for Disease Control and Prevention:
isoniazid resistance
isoniazid intolerance

Additional relevant MeSH terms:
Mycobacterium Infections
Actinomycetales Infections
Gram-Positive Bacterial Infections
Bacterial Infections
Antibiotics, Antitubercular
Antitubercular Agents
Anti-Bacterial Agents
Anti-Infective Agents
Leprostatic Agents
Nucleic Acid Synthesis Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Cytochrome P-450 CYP2B6 Inducers
Cytochrome P-450 Enzyme Inducers
Cytochrome P-450 CYP2C8 Inducers
Cytochrome P-450 CYP2C19 Inducers
Cytochrome P-450 CYP2C9 Inducers
Cytochrome P-450 CYP3A Inducers
Fatty Acid Synthesis Inhibitors
Hypolipidemic Agents
Lipid Regulating Agents