Feasibility and Accuracy of a Novel Xpert Cartridge

Completed

• Conditions: Tuberculosis
• Interventions: Device: Investigational Xpert DST test

• Registration Number: NCT02251327
• Lead Sponsor: Johns Hopkins University

Brief Summary

Consenting adults will be interviewed for demographic and medical information, and then will be asked to provide two expectorated sputum specimens. In the study laboratory, sputa will be tested using conventional and investigational diagnostic tests for tuberculosis.

Detailed Description

* For each of isoniazid, ofloxacin, moxifloxacin, amikacin, and kanamycin: sensitivity and specificity of the investigational Xpert test for detection of drug resistance, using phenotypic drug susceptibility testing as the reference comparator

* For each of isoniazid, ofloxacin, moxifloxacin, amikacin, and kanamycin: sensitivity and specificity of the investigational Xpert test for detection of drug resistance, using mycobacterial DNA sequencing as the reference comparator

* Sensitivity and specificity, for detection of M. tuberculosis in sputum, of the investigational Xpert test and of the conventional Xpert MTB/RIF test, using culture as the reference comparator

* Diagnostic yield (for tuberculosis) of the investigational Xpert test and of the conventional Xpert MTB/RIF test

* For the investigational Xpert test, the proportion of specimens with a result of 'invalid' and the proportion of specimens with a result of 'error'

* Proportion of study participants with M. tuberculosis detected in sputum

* Proportion of participants with drug resistant tuberculosis, by drug resistance pattern and by tuberculosis categorization (new case or not new case)

Study Timeline

• Study Start: 2014-06-04
• Study First Submitted: 2014-09-23
• Study First Submitted QC: 2014-09-25
• Study First Posted: 2014-09-29
• Primary Completion: 2015-06-15
• Study Completion: 2015-12
• Status Verified: 2018-08
• Last Update Submitted: 2018-08-20
• Last Update Posted: 2018-08-22

Recruitment & Eligibility

• Status: COMPLETED
• Sex: All
• Target Recruitment: 401

Inclusion Criteria

• Individuals must meet all of the following inclusion criteria in order to be eligible to participate:

  • Age ≥ 19 years (age of majority) if enrolled in South Korea; age ≥ 18 years (age of majority) if enrolled in China
  • Provision of informed consent
  • Clinical signs and/or symptoms suggestive of pulmonary tuberculosis
  • Meets one of the following criteria:

A. Suspected or confirmed new pulmonary tuberculosis case who has received anti-tuberculosis drugs for less than 3 (three) days (target enrollment for Group A is approximately 50 participants).

B. Confirmed pulmonary tuberculosis with documented rifampin resistance, who has received anti-tuberculosis drugs for 31 days or less C. History of prior tuberculosis PLUS ongoing signs and/or symptoms of pulmonary tuberculosis PLUS suspected drug resistance

Exclusion Criteria

• Inability to provide a sputum specimen

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
Case detection group	Investigational Xpert DST test	Suspected or confirmed new pulmonary tuberculosis cases who have received anti-tuberculosis drugs for less than 3 (three) days and provide up to two expectorated sputum specimens. One investigational Xpert DST test and one Xpert MTB/RIF test were performed directly on the same sputum specimen; in addition, one smear microscopy test, one mycobacterial liquid culture, and one solid culture were performed after digestion and decontamination of sputum.
Drug resistance risk group	Investigational Xpert DST test	Confirmed pulmonary tuberculosis cases with documented rifampin resistance, who have received anti-tuberculosis drugs for 31 days or less and/or history of prior tuberculosis PLUS ongoing signs and/or cases with symptoms of pulmonary tuberculosis PLUS suspected drug resistance and provide up to two expectorated sputum specimens. One investigational Xpert DST test and one Xpert MTB/RIF test were performed directly on the same sputum specimen; in addition, one smear microscopy test, one mycobacterial liquid culture, and one solid culture were performed after digestion and decontamination of sputum.

Primary Outcome Measures

Name	Time	Method
Sensitivity and specificity	10 months	sensitivity and specificity of the investigational Xpert DST test for detection of drug resistance, using phenotypic drug susceptibility testing, mycobacterial DNA sequencing, and MTB/RIF test as the reference comparator

Secondary Outcome Measures

Name	Time	Method
the proportion of specimens with a result of 'invalid' and the proportion of specimens with a result of 'error'	10 months
Proportion of study participants with TB and DRTB	10 months
Diagnostic yield (for tuberculosis) of the investigational Xpert test and of the conventional Xpert MTB/RIF test	10 months