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To investigate the clinical efficacy of miRNA, cell-free DNA, and circulating tumour cells in biliary tract cancer diagnosis. A comprehensive literature search was conducted up to September 2021, using public databases. The quality of the screened articles was evaluated using the Quality Assessment of Diagnostic Accuracy Studies (QUADAS 2) tool followed by statistical analysis. Revman 5.4, Meta-disc 1.4, and MetaEssential were used for the statistical estimation. A total of 28 studies were retrieved that involved 3,333 participants (1,874 patients and 1,450 control). Overall performance in terms of pooled sensitivity and specificity was 0.84 and 0.91 individually. Moreover, positive likelihood ratio (PLR), negative likelihood ratio (NLR), and area under the curve (AUC) were 10.29, 0.15, and 0.9567 respectively. Subgroup analysis based on the sample source revealed that plasma can be a prominent source in diagnosing BTC. Publication bias assessed using Begg’s and Egger’s test reported that no publication bias was present ( p -value: 0.083, 0.162). The miRNA and cell-free DNA exhibited a high diagnostic value in early diagnosis. While CTCs might be useful in the later stages.

Circulating miRNA and cell-free DNA as a potential diagnostic tool in early detection of biliary tract cancer: a meta-analysis