Validation of new technologies for the diagnostic evaluation of active tuberculosis (VANTDET)

File Description SizeFormat 
Halliday et al. EME.pdfFile embargoed until 01 January 100004.92 MBUnknown    Request a copy
Title: Validation of new technologies for the diagnostic evaluation of active tuberculosis (VANTDET)
Authors: Halliday, A
Jain, P
Hoang, L
Parker, R
Tolosa-Wright, M
Masonou, T
Green, N
Boakye, A
Takwoingi, Y
Hamilton, S
Mandagere, V
Fries, A
Coin, L
Deeks, J
White, P
Levin, M
Beverley, P
Kon, O
Lalvani, A
Item Type: Journal Article
Abstract: Background: Tuberculosis (TB) is a devastating disease for which new diagnostic tests are desperately needed. Objective: To validate promising new technologies (namely whole blood transcriptomics, proteomics, flow cytometry and qRT-PCR) and existing signatures for detection of active TB in samples obtained from individuals suspected of active TB. Design: Four sub-studies, each of which used the samples from biobank collected as part of the IDEA study, which was a prospective cohort of patients recruited with suspected TB. Setting: secondary care Participants: Adults (aged ≥ 16 years old) presenting as inpatients or outpatients at 12 NHS hospital trusts in London, Slough, Oxford, Leicester and Birmingham with suspected active TB. Interventions: New tests using either: genome-wide gene expression microarray (transcriptomics); SELDI TOF/ LC-MS (proteomics), flow cytometry, qRT-PCR. Main outcome measures: Area under the curve (AUC), sensitivity and specificity, were calculated to determine diagnostic accuracy. Positive and negative predictive values were calculated in some cases. A decision tree model was developed to calculate the incremental costs and quality-adjusted life-years (QALYs) of changing from current practice to using the novels tests. Results: The project and 4 sub-studies which assessed the previous published signatures measured using each of the new technologies, and a health economic analysis where the best performing tests were evaluated for cost effectiveness. The diagnostic accuracy of the transcriptomic tests ranged from AUC=0.81-0.84 for detecting all TB in our cohort. The performance for detecting culture confirmed TB or pulmonary TB (PTB) was better than for highly probable TB or extrapulmonary TB (EPTB) respectively, but not high enough to be clinically useful. None of the previously described serum proteomic signatures for active TB provided good diagnostic accuracy, not did the candidate rule-out tests. Four of six previously described cellular immune signatures provided a reasonable level of diagnostic accuracy (AUC = 0.78-0.92) for discriminating all TB from those with other disease (OD) and latent TB infection (LTBI) in HIV- TB suspects. Two of these assays may be useful in the IGRA+ population and can provide high positive predictive value (PPV). None of the new tests for TB can be considered cost effective. Limitations: The diagnostic performance of new tests within the HIV+ population was either underpowered or not sufficiently achieved in each sub-study. Conclusions: Overall, the diagnostic performance of all previously identified ‘signatures’ of TB was lower than previously reported. This likely reflects the nature of the cohort we used, which includes the harder to diagnose groups, such as culture unconfirmed TB, and EPTB, which were underrepresented in previous cohorts. Future work: We are yet to perform our secondary objective f deriving novel signatures of TB using out datasets. This was beyond the scope of this report. We recommend that future studies using these technologies target specific sub-types of TB, specifically those groups where new diagnostic tests are required.
Date of Acceptance: 6-Jan-2019
URI: http://hdl.handle.net/10044/1/66969
ISSN: 2050-4365
Publisher: NIHR Journals Library
Journal / Book Title: Efficacy and Mechanism Evaluation
Copyright Statement: This paper is embargoed until publication.
Sponsor/Funder: National Institute for Health Research
Funder's Grant Number: 12/65/27
Publication Status: Accepted
Embargo Date: publication subject to indefinite embargo
Appears in Collections:National Heart and Lung Institute
Department of Medicine
Faculty of Medicine
Epidemiology, Public Health and Primary Care



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Creative Commonsx