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Flowchart of paper selection. After an initial evaluation and removal of duplicates, 93 studies were first selected. Only English-written papers reporting the outcomes of ≥10 patients with unresectable ICC were considered. Outcomes must be referred to SBRT for ICC only. If other diseases or techniques were involved, results must be expressed separately. ICC, intrahepatic cholangiocarcinoma; SBRT, stereotactic body radiation therapy.
