Impact of Whole-Genome Sequencing of Mycobacterium Tuberculosis On Treatment Outcomes for MDR-TB/ XDR-TB: A Systematic Review Protocol
Abstract Background The emergence of drug-resistant tuberculosis (DR-TB) is a persistent threat to public health. The detection of DR-TB requires culture-based drug susceptibility testing (DST) or rapid molecular assays for targeted genes. The recent advances in Whole-genome sequencing (WGS) technology have offered a new capacity to identify resistance-conferring mutations in Mycobacterium tuberculosis (MTB). This study reviews and quantifies the emerging evidence on the association between genomic markers of drug resistance in MTB identified by WGS and treatment outcomes for DR-TB. Methods A literature search will be conducted in NCBI PubMed, Scopus, Cochrane Library, Web of Science, and CINAHL (Ebsco) to retrieve all the relevant original reports from 2000 onwards. Clinical trials and observational studies describing different applications of WGS to genotypic resistance testing for TB and detection of MDR-TB/ XDR-TB as well as treatment outcomes of the patients will be included. Two primary reviewers will separately screen and select papers for data extraction, risk of bias, and assess the quality. Any disagreement between the reviewers' will be clarified by a third reviewer. The I2 statistics will be used to assess the heterogeneity of the included studies and if the data are sufficiently homogenous, a meta-analysis will be performed. The Egger's test and visual representation of the funnel plot will be used to monitor for publication bias. Narrative data synthesis will be conducted for all the included studies if performing meta-analysis is not possible. Discussion This systematic review will examine the evidence on the feasibility and added value of WGS in improving treatment outcomes in DR-TB patients. The rapid detection of drug-resistance conferring mutations and selection of appropriate drug regimens is likely to improve the cure rates while minimizing adverse events and treatment costs. Hence, the outcome of this systematic review will inform policy-making and will guide clinical laboratory practice to improve drug resistance diagnostic capacity and treatment outcomes. Systematic review registration: PROSPERO CRD42020197099.