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Background
The role of carbohydrate antigen 19‐9 (CA 19‐9) in response assessment among patients with intrahepatic cholangiocarcinoma (iCCA) remains unknown. The authors studied the association of the CA 19‐9 response (defined as a reduction >50% from baseline) with the radiologic response and the outcome in patients with unresectable iCCA.
Methods
A prospective cohort of 422 patients who were...