The goal of this observational study is to detect the methylation characteristics of cfDNA in the bile and plasma of patients with bile duct stricture. The main question it aims to answer is: Can the developed model, using peripheral blood and bile cell-free DNA sequencing, work well in screening and classifying unknown biliary stricture? Participants will collect approximately 10ml of peripheral blood and 5ml of bile from the patient.
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Diagnostic accuracy
Timeframe: Immediately after test completion
Sensitivity
Timeframe: Immediately after test completion
Specificity
Timeframe: Immediately after test completion