Clinical Trial: Interferon Gamma Release Assays (IGRA) Testing Versus Tuberculin Skin Test in Renal Transplant Recipients

Study Status: Completed
Recruit Status: Completed
Study Type: Observational

Official Title: Interferon Gamma Release Assays Versus Tuberculin Skin Testing for the Detection of Latent Tuberculosis Infection in Renal Transplant Recipients

Brief Summary:

Interferon gamma release assays (IGRA) have been shown to be more specific and sensitive for the detection of tuberculosis (latent or active infection) than the tuberculin skin test (TST) in immunocompetent individuals. However, very little data are available concerning the relative performance of IGRA and TST in immunosuppressed individuals from other causes than HIV.

The investigators hypothesize that IGRAs would be more sensitive and specific than the TST in a group of renal transplant recipients under chronic immunosuppressive treatment for detecting latent tuberculosis infection.


Detailed Summary:

In a recent study (Triverio PA et al. "Interferon-gamma release assays versus tuberculin skin testing for detection of latent tuberculosis in haemodialysis patients". Nephrol Dial Transplant 2009; 24: 1952-6), the investigators had compared 2 IGRAs (T-SPOT.TB and Quantiferon Gold) with the TST and shown that one IGRA was clearly more sensitive than the TST but that both tests had a very low sensitivity for detecting prior TB.

This study applies the same protocol to renal transplant recipients undergoing routine annual check-up visits: questionnaire with detailed collection of risk factors for latent tuberculosis infection (LTBI), history of prior contact with tuberculosis (TB), BCG (Bacille of Calmette and Guerin vaccine), prior TB or LTBI, treatment for TB or LTBI, analysis of chest X-ray for signs of prior TB, on-going treatment, level of immunosuppression (CD4 lymphocytes), simultaneous blood sampling for T-SPOT.TB and Quantiferon Gold, and tuberculin skin testing.


Sponsor: Ligue Pulmonaire Genevoise

Current Primary Outcome:

  • Agreement between results of QuantiFERON-Gold-in-tube and probability of latent tuberculosis infection [ Time Frame: Up to 3 years ]
    Agreement between probability of latent tuberculosis infection - established on the basis of a questionnaire and chest X-ray - and results of QuantiFERON-Gold-in-tube is computed
  • Agreement between results of T-SPOT.TB and probability of latent tuberculosis infection [ Time Frame: Up to 3 years ]
    Agreement between probability of latent tuberculosis infection - established on the basis of a questionnaire and chest X-ray - and result of T-SPOT.TB is computed


Original Primary Outcome: Same as current

Current Secondary Outcome: Agreement between results of IGRA tests and TST in renal transplant recipients [ Time Frame: Up to 3 years ]

Agreement between results of IGRA testing and between each IGRA test and TST will be determined by computing kappa values


Original Secondary Outcome: Same as current

Information By: Ligue Pulmonaire Genevoise

Dates:
Date Received: July 5, 2011
Date Started: January 2010
Date Completion:
Last Updated: May 30, 2012
Last Verified: May 2012