This is a multi-center, retrospective, observational study of patients receiving first-line systemic therapy as routine clinical care for unresectable BTC in Japan. This study attempts to test the hypothesis that the occurrence of biliary complications requiring hospitalization during first-line systemic therapy for unresectable BTC, which is as a time-dependent covariate, affects time to treatment failure (TTF) .
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Time to treatment failure (TTF)
Timeframe: From 1st dose of first-line systemic therapy until disease progression or death by any cause or discontinuation of first-line systemic therapy for unresectable BTC by physician's decision, whichever came first, assessed up to 2 years.